huong dan su dung may nen khi khong dau hitachi dsp 90-120 vawn

Prior to operation of this air compressor, ensure that all operators read and understand this INSTRUCTION MANUAL completely, thereby operating it safely and properly.

Place the INSTRUCTION MANUAL near the air compressor to make it available at any time, and refer to it as the need arises.

INSTRUCTION MANUAL

DSP-90ALN DSP-90AMNDSP-100ALN DSP-100AMNDSP-120AMN DSP-100VAMN

● This INSTRUCTION MANUAL explains in detail the important items that require attention; observed as the following:

● Always observe notations of WARNING, CAUTION and IMPORTANT, as they indicate considerable risks to safety.

HITACHI Oil-Free Rotary Screw Air Compressor

NEXNEXTTseriesseriesAir-Cooled

DSP-90WLN DSP-90WMNDSP-100WLN DSP-100WMNDSP-120WMN DSP-100VWMN

Water-Cooled

GRAPHIC DESCRIPTIONS:

WARNING： This is a warning. If handled improp-erly, death or severe injury could result.

CAUTION： This is a caution. If handled improp-erly, injury and/or physical damage could result.

Air-Cooled ：This graphic is air-cooled type.

：This graphic is water-cooled type.

： This graphic is Variable Speed-control Drive (VSD) models.

Water-Cooled

IMPORTANT ： This graphic is for items that need attention, other than WARNING and CAUTION.

： This graphic is a page number reference.

TWO STAGE

How to Use This Instruction Manual

■Model Number Nomenclature

● This Instruction Manual covers the standard models of the Hitachi DSP air compressor.● This Instruction Manual intended to assist daily operators and maintenance personnel

in the installation, operation, control and service of the Hitachi DSP air compressor.● Prior to operation of this air compressor, ensure that all operators read and understand

this INSTRUCTION MANUAL completely, thereby operating it safely and properly.　 Place the INSTRUTION MANUAL near the air compressor to make it available at any

time, and refer to it as the need arises.● If there are any questions or comments, please contact the local Hitachi distributor or

the nearest Hitachi office.● Fill your DSP’s model name, Serial Number, etc. into the back cover of this Instruction Manual.

Such information may be helpful when ordering parts, periodic maintenance, and overhaul.

● Hitachi may make improvements and/or changes in the products described in this publication at any time without notice.

DS P - 100 V A 5 M N Dry or Oil-Free Rotary

Screw Air Compressor

Packaged

N-Type (NEXT Series)

Main Voltage(L: 200V class, M: 400V class)

Frequency (5: 50 Hz, 6: 60 Hz)

A: Air-Cooled, W: Water-Cooled

w/ V: VSD, w/o V: Fixed

Motor Output (kW)

Never remove a protective device from the air compressor or modify the air compressor.

It is imperative to install an earth leakage (ground) circuit breaker on the power cable. This prevents a ground fault accident.

DSP air compressors are not designed, intended or approved for breathing air applications. Hitachi does not approve specialized equipment for breathing air applications and assumes no respon-sibility or liability for compressors used for breathing air services.

WARNING

■ International System of Units (SI)

For the unit of pressure the International System of Units (SI) is used throughout this manual. To convert it into the conventional system of units, use the following conversion formula:7.14 kgf/cm2 = 0.70 MPa　or　1 kgf/cm2 = 0.098 MPa

1

Contents

1. SAFETY ………………………………………………………………………………………… 2

2. GENERAL DESCRIPTION 2.1 Appearance ……………………………………………………………………… 6 2.2 Components …………………………………………………………………… 8 2.3 Daily Operating Components ……………………………………………… 10

3. OPERATING THE DSP 3.1 Instrument Panel ……………………………………………………………… 12 3.2 Start/Stop Operation ………………………………………………………… 14 3.3 How to Use the liquid Crystal Display (LCD) ……………………………… 15 3.4 How to Use the Digital Monitor …………………………………………… 25 3.5 Daily Operation ………………………………………………………………… 32 3.6 Oil Mist Remover Daily Operation ………………………………………… 34

3.7 Adjusting the DSP ……………………………………………………………… 34

4. TROUBLESHOOTING 4.1 Protective Devices …………………………………………………………… 35 4.2 Troubleshooting the Air Compressor ……………………………………… 37 4.3 Troubleshooting the Oil Mist Remover …………………………………… 38

5. INSTALLING 5.1 Unpacking the DSP Air Compressor ……………………………………… 39　 AND PIPING THE DSP 5.2 Conveying the DSP Air Compressor ……………………………………… 39 5.3 Installing the DSP Air Compressor ………………………………………… 40 5.4 Piping the DSP Air Compressor …………………………………………… 41 5.5 Ventilation of Air Compressor Room ……………………………………… 44

6. STARTUP OPERATION 6.1 Air Compressor ………………………………………………………………… 46 6.2 Oil Mist Remover ……………………………………………………………… 48

7. WIRING 7.1 Power Supply Transformer and Power Cable …………………………… 49 7.2 Connecting a Power Cable …………………………………………………… 49 7.3 Wiring Connection Diagram ………………………………………………… 51 7.4 Control Panel /LCD monitor Specifications ……………………………… 51

8. STANDARD COMPONENTS 8.1 Standard Components ………………………………………………………… 57　　 AND SUBSYSTEMS 8.2 Air/Oil Flow ……………………………………………………………………… 58 8.3 Cooling Water ………………………………………………………………… 63 8.4 Capacity Control System ……………………………………………………… 64 8.5 Outline of Oil Mist Remover Subsystem …………………………………… 69

9. MAINTAINING THE DSP 9.1 Air Compressor Maintenance ……………………………………………… 70 9.2 Standard Maintenance Schedule …………………………………………… 71 9.3 Oil Mist Remover Maintenance ……………………………………………… 75 9.4 How to Service the DSP Air Compressor ………………………………… 76

10. PRECAUTIONS WHEN THE COMPRESSOR IS TO BE IDLE FOR AN EXTENDED PERIOD OF TIME ………… 89

11. PARTS LIST ………………………………………………………………………………………… 90

12. WARRANTY, AFTER-SALES AND SERVICE …………………………………………………………… 114

13. OPERATION RECORD LOGBOOK …………………………………………………………………………… 115

14. STANDARD SPECIFICATIONS ……………………………………………………………………………… 116

013B0816

012B1240012B1240

Rotating Parts!●Keep hands and rods, etc. away from

the rotating parts (Cooling fans, etc.)●Use caution at all times, when air com-

pressor is powered. The air compres-sor may be capable of restarting with-out hitting the START button.

●When the air compressor is operating, do not remove or open the enclosure panels and doors.

●Before servicing the air compressor, stop it, disconnect the power, especially when accessing any rotating parts.

WARNING

Hot Surface!●Do not directly touch any component

inside the air compressor enclosure when the air compressor is operating or immediately after it has stopped, as the components are extremely hot and can cause severe injury.

●Before servicing the air compressor, stop it, disconnect the power, then wait for the air compressor to cool down.

Heated!!

Air End

Discharge Air pipe

Hot Surface!●Do not directly touch any component

inside the air compressor enclosure when the air compressor is operating or immediately after it has stopped, as the components are extremely hot and can cause severe injury.●Before servicing the air compressor,

stop it, disconnect the power, then wait for the air compressor to cool down.

Air End

Discharge Air Pipe

Hot Surface!

Aftercooler

Intercooler

WARNING

Heated!!

WARNING

WARNING

Heated!!

●Do not directly touch any component inside the air compressor enclosure when the air compressor is operating or immediately after it has stopped, as the components are extremely hot and can cause severe injury.●Before servicing the air compressor,


To ensure safe and proper operation of the air compressor, it is indispensable to carefully read and understand the following warnings and instructions detailed below. These warn-ings and instructions are attached to the air compressor as shown in the figure below.

Air-Cooled DSP- 90/120AN100VAN

2

1. SAFETY

013B0816

012B1240012B1240

Do Not Breathe Air!Discharge air can contain Carbon Monoxide and other contaminants. Breathing the air can cause severe injury or death.

High Pressure Air!●High pressure air can cause severe injury or death.

Be careful when air compressor is operating. 　Pressurized air can blow out of safety relief valves

and etc. at incredibly high velocities.●When using compressed air to clean equipment,

use extreme caution and/or wear eye protection.●Before servicing the air compressor, stop it,

disconnect the power, and relieve pressure before removing filter, plug, fitting or cover.

Rotating Parts!●Keep hands and rods, etc. away from the rotating

parts (Cooling fans, etc.)●Use caution at all times, when air compressor is

powered. The air compressor may be capable of restarting without hitting the START button.●When the air compressor is operating, do not

remove or open the enclosure panels and doors.●Before servicing the air compressor, stop it, dis-

connect the power, especially when accessing any rotating parts.

Electric Shock Hazard!●Before servicing or wiring the air compressor,

disconnect the power. This will prevent anyone from turning on the power and causing an electric shock that could lead to severe injury or death.●Do not allow any unlicensed person to wire the air

compressor. Always use a licensed electrician.●Ground the air compressor.

Electric Shock Hazard!●Before servicing or wiring the

air compressor, disconnect the power. This will prevent anyone from turning on the power and causing an elec-tric shock that could lead to severe injury or death.●Do not allow any unlicensed

person to wire the air compres-sor. Always use a licensed electrician.●Ground the air compressor.

WARNING

WARNING WARNING

WARNING

WARNING

Hot Surface!●Do not directly touch the air end, discharge air

pipe,and coolers when the air compressor is operating and immediately after it has stopped, because these parts are heated then.

●Before servicing the air compressor (especially when accessing to the heated parts), stop it, discon-nect the power, and wait until it is cooled down.

WARNING

CAUTION

Precaution against Fire!●Keep any other hazardous materials such as

flammable solvents away from the air compressor. Also do not use fire nearby it; otherwise a spark

may enter the air compressor and burn it internally. ●Do not remove any protective relay’s. Also do not

make a modification of the control circuit that may result in impairing the protective relay’s function. Remember that the loss of the protective relay’s function may cause serious damage.

●Install an earth leakage circuit breaker between the air compressor and the power supply. Do not use a disconnector such as a knife switch because it cannot protect the air compressor and may cause burnout of the air end if a ground fault has occurred.

3

1. SAFETY

013B0816

012B1240012B1240

Hot Surface!

WARNING

Heated!!

Air End

Discharge Air pipe

Hot Surface!

WARNING

Air End

Discharge Air Pipe

Heated!!

Aftercooler

Intercooler

Heated!!

Hot Surface!

WARNING

WARNING

Rotating Parts!●Keep hands and rods, etc. away from

the rotating parts (Cooling fans, etc.)●Use caution at all times, when air com-

pressor is powered. The air compres-sor may be capable of restarting with-out hitting the START button.

●When the air compressor is operating, do not remove or open the enclosure panels and doors.

●Before servicing the air compressor, stop it, disconnect the power, especially when accessing any rotating parts.

●Do not directly touch any component inside the air compressor enclosure when the air compressor is operating or immediately after it has stopped, as the components are extremely hot and can cause severe injury.

●Before servicing the air compressor, stop it, disconnect the power, then wait for the air compressor to cool down.





Water-Cooled DSP- 90/120WN100VWN

4

1. SAFETY

013B0816

012B1240012B1240

Electric Shock Hazard!

WARNING

●Before servicing or wiring the air compressor, disconnect the power. This will prevent anyone from turning on the power and causing an elec-tric shock that could lead to severe injury or death.●Do not allow any unlicensed

person to wire the air compres-sor. Always use a licensed electrician.●Ground the air compressor.

Do Not Breathe Air!Discharge air can contain Carbon Monoxide and other contaminants. Breathing the air can cause severe injury or death.

High Pressure Air!●High pressure air can cause severe injury or death.

Be careful when air compressor is operating. 　Pressurized air can blow out of safety relief valves

and etc. at incredibly high velocities.●When using compressed air to clean equipment,

use extreme caution and/or wear eye protection.●Before servicing the air compressor, stop it,

disconnect the power, and relieve pressure before removing filter, plug, fitting or cover.

Rotating Parts!●Keep hands and rods, etc. away from the rotating

parts (Cooling fans, etc.)●Use caution at all times, when air compressor is

powered. The air compressor may be capable of restarting without hitting the START button.●When the air compressor is operating, do not

remove or open the enclosure panels and doors.●Before servicing the air compressor, stop it, dis-

connect the power, especially when accessing any rotating parts.

Electric Shock Hazard!●Before servicing or wiring the air compressor,

disconnect the power. This will prevent anyone from turning on the power and causing an electric shock that could lead to severe injury or death.●Do not allow any unlicensed person to wire the air

compressor. Always use a licensed electrician.●Ground the air compressor.

WARNING WARNING

WARNING

WARNING

Hot Surface!●Do not directly touch the air end, discharge air

pipe,and coolers when the air compressor is operating and immediately after it has stopped, because these parts are heated then.

●Before servicing the air compressor (especially when accessing to the heated parts), stop it, discon-nect the power, and wait until it is cooled down.

WARNING

CAUTION

Precaution against Fire!●Keep any other hazardous materials such as

flammable solvents away from the air compressor. Also do not use fire nearby it; otherwise a spark

may enter the air compressor and burn it internally. ●Do not remove any protective relay’s. Also do not

make a modification of the control circuit that may result in impairing the protective relay’s function. Remember that the loss of the protective relay’s function may cause serious damage.●Install an earth leakage circuit breaker between

the air compressor and the power supply. Do not use a disconnector such as a kni fe switch because it cannot protect the air compressor and may cause burnout of the air end if a ground fault has occurred.

5

1. SAFETY

Enclosure

Oil Filling Port

Air Intake(Inlet to the Air End)

Oil Level Gauge

OMR

Sling Fitting

Instrument Panel

Left Door

Plate of Operating / Servicing Instructions

Air Exhaust(Air Compressor Package)

Compressed Air Discharge

Power Supply Port

Air Intake(Air Compressor Package)

Air ExhaustAir Intake

Enc losu re pane ls lower the sound level of the air compressor package.

Use the port to fill the gear case with oil.

This indicates the quantity of the oil in the gear case. Check the oil level before starting the DSP and when operating it.

Use the sling fitt ing w h e n m o v i n g a n d installing the DSP air compressor.

See page pp. 12-13, chapter 3, for details.

Read carefully the plate before operating and servicing the DSP.

Open the le f t door only when servicing the DSP air compres-sor. Keep i t c losed when operating the DSP air compressor.

See page 69 for the details

This panel discharges the hot air generated in the air compressor.

Check the specifica-tions, power supply and voltage before connecting the power supply.

Air Exhaust

Air Intake

Air Intake Air Intake

Air Intake

Air Intake(Air for inverter)

Air Intake(Air for coolers)

2.1 AppearanceAir-Cooled DSP- 90/120AN

100VAN

This section illustrates and describes the major components of the DSP air compressor. Be familiar with the name, location and function of each component before using the DSP air compressor.

［Front View］

［Rear View］

6

2. GENERAL DESCRIPTION


Enclosure

Oil Filling Port

Air Intake(Inlet to the Air End)

Oil Level Gauge

OMR

Sling Fitting

Instrument Panel

Left Door

Plate of Operating / Servicing Instructions

Air Exhaust(Air Compressor Package)


Power Supply Port

Air Intake(Air Compressor Package)

Air Exhaust Air Intake

Enclosure pane ls lower the sound level of the air compressor package.

Use the port to fill the gear case with oil.

This indicates the quantity of the oil in the gear case. Check the oil level before starting the DSP and when operating it.

Use the sling fitt ing w h e n m o v i n g a n d installing the DSP air compressor.

See page pp. 12-13, chapter 3, for details.

Read carefully the plate before operating and servicing the DSP.

Open the lef t door only when servicing the DSP air compres-sor. Keep it closed when operating the DSP air compressor.

See page 69 for the details

This panel discharges the hot air generated in the air compressor.

Check the specifica-tions, power supply and voltage before connecting the power supply.

Air Exhaust

Air Intake

Air Intake Air Intake

Air Intake

Air Intake(Air for inverter)

Air Intake(Air for Package)

［Front View］

［Rear View］

7

2. GENERAL DESCRIPTION [Appearance]

2.2 Components

Cooling Fan

Check Valve

Intercooler

Aftercooler

Oil Filter

Oil Cooler

Air Intake Filter1st-Stage Air End

2nd-Stage Air EndMain Motor

Oil Mist Remover

Discharge Pipe (Compressed Air Discharge)

Oil Level Gauge

Common Base

Starter / Control Box

Safety Relief Valve Enclosure

Instrument Panel

High-Precooler

Air-Cooled DSP- 90/120AN100VAN

8

2. GENERAL DESCRIPTION [Components]

Cooling Fan

Check Valve

Intercooler

Aftercooler

Oil Filter

Oil Cooler

Air Intake Filter

1st-Stage Air End

2nd-Stage Air End

Main Motor

Oil Mist Remover

Discharge Pipe(Compressed Air Discharge)

Oil Level Gauge

Common Base

Enclosure

Instrument Panel

Safety Relief Valve



9

2. GENERAL DESCRIPTION [Components]

Oil Filling Port

Oil Level Gauge

● Indicates the operation control section.　 ( For more information, see Chapter 3 on

page 12.)● Operation ON → POWER light on.● Start: Press START button → Operation Light on

during operation● Stop: Press UNLOAD STOP button → unloading

operation stops for 5 minutes → Operation Light off during operation

● Power OFF: → POWER light off

2.3 Daily Operating Components

Controls on the Instrument Panel

Aftercooler and Intercooler - Condensate Drain ValveLubricating Oil

Oil Level Gauge1 2

3 4

● Please use the following lubricating oil exclusively for rotary compressor.

Manufacturer Description

IDEMITSU DAPHNE NEW ROTARY COMPRESSOR OIL A

COSMO OIL LUBRICANTS COSMO SCREW 32X

JAPAN ENERGY JOMO SCREW 32

SHELL CORENA OIL RS32

NIPPON OIL FAIRCOL RA32

EXXON MOBIL MOBIL RARUS 424J

*Oil company may change oil name without notice.

モニタ

メニューリセット

遠方

機能

電源

運転停止

運転状況

故障

運転管理

負荷

遠方

起動待ち

設定

自動

UP/　DOWN

警報

記憶

表示切替/ワイドモード

＋／－

AUTO

MONITOR

MENU

SET

SELECT/WIDE

2

RUNNING CONTROL

STARTREMOTE

1

FUNC

［× 10h］

ALARM

STR

REMOTE

RUNNING MODE

AUTO START

POWER

LOAD

RESETSHUTDOWN

STOP

MONITOR

UNLOAD STOP

● Verify that air containing drainage is discharged intermittently from the intercooler and after cooler drain ports.

　 The higher the temperature and humidity, the more drain-

age is produced. Drainage may not be produced on the

intercooler side during winter.

[Fixed speed type]

Intercooler drain port

After cooler drain port

Intercooler drain port

After cooler drain port

Control pipe filter drain port

● Verify that the oil level of the lubricating oil is between the red lines during operation.

　 Lubricating oil circulates in the cooler and piping during

operation, so the position of the oil level differs when the

compressor is running and when it is off. The level rises

when the compressor stops running.

10

2. GENERAL DESCRIPTION [Daily Operating Components]

Control Line Filter

Manual Valve Level Gauge

① Shut off the cooling water when the compressor is off.

② Open the peacock for draining water. Also open

the valve of the water drain port and drain the

cooling water.

③ Be especially careful of freezing during the winter.

( For details, see page 63.)

Water drain peacock

Water drain port

Cooling Water5

● Normally use the UNLOAD STOP button to stop the compressor. The compressor then unloads for 5 minutes and stops running.

(In the case of an emergency, press the STOP button to stop operation.)

Stopping operation7

モニタ


遠方

機能

電源

運転停止

運転状況

故障

運転管理

負荷

遠方

起動待ち

設定

自動

UP/　DOWN

警報

記憶


＋／－

AUTO

MONITOR

MENU

SET

SELECT/WIDE

2

RUNNING CONTROL

STARTREMOTE

1

FUNC

［× 10h］

ALARM

STR

REMOTE

RUNNING MODE

AUTO START

POWER

LOAD

RESETSHUTDOWN

STOP

MONITOR

UNLOAD STOP

Keeping the second-stage air end as dry as possible is essential for preventing it from rusting due to a long-term operation suspension. When stopping the DSP, therefore, execute an unloading operation and thereby remove the moisture from the second-stage air end.

Controls on the Instrument Panel[Fixed speed type]6

① Check the sight glass of the control line filter for the accumulation of the condensate.

② To drain the accumulated condensate, slowly turn to the left the condensate drain valve to open.

After draining the condensate, turn it to the right to close.

11

2. GENERAL DESCRIPTION [Daily Operating Components]

IMPORTANT

12

3. OPERATING THE DSP

3.1 Instrument Panel

＋／－

AUTO

MONITOR

MENU

SET

MONITOR

モニタ

メニュー

設定

自動

UP/　DOWN

Liquid Crystal Display(LCD)

Displays the operation data, various setting, shutdowns/ alarms information, etc. ( page 15)

MENU Button

Functions to display the menu screen and move the cursor.( page 20)

+/- UP DOWN Buttons

Each of these buttons act as an up-arrow, down-arrow and right-arrow key.( page 20)

SET Button

It saves any adjusted set points.

Contrast adjustment

SET+[　] button operation: Brightens the display.SET+[　] button operation: Darkens the display.( page 24)

MONITOR ButtonEnables movement within each of the monitoring displays (M1, M2) and the message display (M3). This button also enables you to return to the M1 display from the FUNCTION MENU display ( page 15).

RESET ButtonReset the system or cancels the shutdown/alarm circuit ( page 17).

ON (glowing) when an automatic operation (an AUTO operation, a schedul-ing operation, or lead/lag operation) is activated. ON (flashing) when external calendar or scheduling operation is abnormal. ( page 18, 22)

AUTO light (yellow)

13

3. OPERATING THE DSP [Instrument Panel]

SELECT/WIDE

2

RUNNING CONTROL

STARTREMOTE

1

FUNC

［× 10h］

ALARM

STR

REMOTE

RUNNING MODE

AUTO START

POWER

LOAD

RESETSHUTDOWN

STOP

POWER light (yellow):ON (glowing) when the power to the air compressor is turned on.

REMOTE light (green):ON (glowing) when the REMOTE button is pressed in order to activate a remote operation.ON (flashing) when an external remote-operation-activation switch has been turned on in order to activate a remote operation. ( page 30)

LOAD light (yellow): ON (glowing) when the air compressor is loading.

AUTO START light (green):ON (glowing) while the air compressor is in a stop due to an AUTO operation, lead/lag operation, or scheduling operation.ON (blinking) while the air compressor is in a stop due to a restartable instantaneous power interruption. ( page 18)

SHUTDOWN light (red): ON (either glowing or blinking) when a shutdown/alarm problem has occurred. ( page 17)

リセット

遠方

機能

電源

運転停止

運転状況

故障

運転管理

負荷

遠方

起動待ち

警報

記憶


Digital MonitorIn addition to basic settings, used to set various types of setting values in combination with the LCD monitor. ( page 24)

SELECT/WIDE Button/Light (Yellow)

Press to confirm various types of setting values, shutdown history, and setting status. ( page 26, 27)To set to ECOMODE (energy conservation mode) (standard type only), press and hold the SELECT/ WIDE button for at least 7 seconds. The light flashes and ECOMODE is set.

START Button

Starts the air compressor.The OPERATION light (red) turns on while the compressor is running.

STOP Button

Stops the compressor immedi-ately. ( page 14)

UNLOAD STOP Button

The air compressor will stop after removing the condensate from the air end. ( page 14)

REMOTE Button

Activates or deactivates a remote start/stop operation locally or on the instrument panel. it also acts as a right-arrow key stop ( page 30).

UNLOAD STOP

Press this button to stop the air compressor.The air compressor will stop after removing the condensate from the air end.※This stop button is effective while a stand alone operation.

RUNNING MODE Light

3.2.1 Connecting the PowerWhen you connect the power, the POWER light turns

on and the LCD monitor displays the following screen

for 5 seconds, and then switches to the monitor screen

(M1) that displays control settings, discharge air pres-

sure, and total operating hours.

If phase is reversed, “Connection Error: Reverse Phase” is displayed on the LCD monitor for setting

and connection inspection. In this case, switch 2 of the

3 main power cables.

If there is no phase, “Connection Error: No Phase” is

displayed on the LCD monitor. In this case, check the

power cables.

3.2 Start/Stop Operation

　　　　

COMPRESSOR　MONITOR

CONTROLLER

＊ The asterisk flashes when the clock and total run-ning hours are engaged.

5 sec

3.2.2 Start/StopWhen the START button is pressed the START light

turns on and the compressor starts operating. When

running, the asterisk on the right side of running hours

flashes and running time is counted.

To stop, press the UNLOAD STOP button. Operation

stops when the air end and the air piping have dried for

5 minutes.

To stop the compressor immediately without unload-

ing, press the STOP button.

Note: If the STOP button is pressed while unloading,

the compressor stops immediately.

14

3. OPERATING THE DSP [Start/Stop Operation]

15

3.3.1 How to Move between the Various Displays

■ Menu Displays

　 Follow the bottom line message on the display.

3.3 How to Use the liquid Crystal Display (LCD)

■ Monitoring Displays

　 There are three monitoring displays: M1, M2, and

M3. To move between these displays, press the

MONITOR button.

機能

FUNCTION

モニタ

MONITOR

モニタ

MONITOR

モニタ

MONITOR

モニタ

MONITOR

■ Monitoring Display（ p.16）

M1 Monitoring Display



■ Message Display（ p.18）

■ Function Menu Display（ p.20）

Function Menu Display

IMPORTANT

About the LCD Backlight(1) In the event that no button has been used for 10

minutes, the LCD backlight automatically turns OFF for protection to the display panel. It comes ON again if any button is pressed, other than the START and STOP buttons.

(2) If an event happens while the LCD backlight is off, the backlight automatically turns ON and stays ON as long as the event exists. The message display is not displayed if the LCD monitor is in remote or instant stop setting mode. Set after referring to “3.4 How to Use the Digital Monitor.” ( page 25)

15

3. OPERATING THE DSP [How to Use the Liquid Crystal Display (LCD)]

■ Message Display

　 There is only one message display: M3 (the con-

tents, however, vary from time to time). It is avail-

able only when some event (air compressor alarm or

shutdown, maintenance notice, etc.) has occurred.

Once an event happens, however, the M3 message

display appears immediately and automatically.

From the M3 display, pressing the MONITOR but-

ton will switch the LCD to the M1 or M2 monitoring

displays; but after approximately ten (10) seconds,

the M1 or M2 monitoring displays will revert back

to the M3 display.

3.3.2 Typical Monitoring Displays

VSDA ＊ SAVE

ECOMODE(Energy Conservation Mode)“SAVE” is displayed on the monitor screen.

Displayed when stop is limited for AUTO opera-tion (standard: no symbol).

INTE ：Fixed speed type control (load/unload operation)

AUTO ： Fixed speed type control

(AUTO operation ＊ optional)

VSDB ：V type control (AUTO function off)

VSDA ： V type control (with AUTO function, V type standard)

EXIT ： Setting display when capacity control is executed

externally

MR ： Multiple unit control connection by communication

control

（1）（2）（3）

（4）

（5）

（6）

（7）（8）（9）

（10）

（11）

（10）

（11）

(1) Displays current time. Asterisk flashes.

(2) Indicates a capacity control type.

(3) Displays compressor discharge port pressure.

(4) Indicates interstage pressure (INTSTG. P), and oil

pressure (OIL PRESS). Blink asterisk indicates running time is being meas-

ured.

(5) Displays load rate.

Indicates total running hours (RUN HR), total

loaded hours (LOAD HR), and total number of loads

(LOAD NOS.).

(6) Indicates a 1st-stage discharge temperature (DIS. TEMP. 1), 2nd-stage discharge temperature (DIS.

When the DSP is operating normally, typical monitor-

ing displays appear as follows.



TEMP. 2), oil temperature (OIL TEMP.), 2nd-stage

suction temperature (2ND SUCT. TEMP.). (In the case of V type, displays current value of

inverter primary side.)

(7) Displays an operating frequency of main motor.

(V type only. Fixed speed type displays ＊＊．＊ )

(8) Displays main motor output (reference value).

(9) Displays master or slave control status when in

lead/lag operation mode.

(10) Displays various pressures and temperatures.

(Asterisk indicates not in use.)

(11) Displays time remaining till next inspection as

maintenance period and next maintenance period.

Current is an approximate S-phase ampere.Output is reference value of calculated power.

IMPORTANT

16


■ Alarm Messages

　 ① In the case an alarm occurs for the compressor, the ALARM light and contents / details displayed on alarm screen on the LCD monitor flash and operation continues. There are 2 types of alarm screens: ALARM and PROBLEM.

② Take the proper corrective action, and press the RESET button.

③ For further information, see pages 35, 36.

NOTE) Malfunction detection of water failure is available for only water cooled single stage compressor. Malfunction

detection of dryer is available for only built-in dryer models. Malfunction detection of oil water separator and

element is not available.

3.3.3 Message Displays■ Shutdown Messages

① When a shutdown occurs for the compressor, the SHUTDOWN light and shutdown contents on the LCD monitor

(contents are displays on the left side and details are displayed on the right side) flash and the compressor stops running. There are 2 types of screens for shutdown: SHUTDOWN and FAILURE.

② Take the proper corrective action, and press the RESET button.

③ For further information, see pages 35, 36.

NOTE) Malfunction detection of water failure is available for only water cooled single stage compressor. Malfunction

detection of dryer is available for only built-in dryer models. Malfunction detection of oil water separator and

element is not available.

(Example) Example of temperature sensor malfunction, sensor 1 discon-nection FAILURE and TEMPERATURE SENSOR flash and the location of the abnormality is indicated.

IMPORTANT

(Example) In the case ALARM and AIR FILTER flash while the com-pressor is running, it indicates the filter is clogged.

(Example) Example of battery replacement period.

(Example) In the case the thermal relay trips and the compressor stops running, SHUTDOWN and OVERLOAD flash and the mal-function part of the main circuit is indicated.

17


ALARM and PROBLEM messages are treated as alarms, but aside from connection abnormalities that make operation impos-sible such as reverse phase and no phase when power is turned on, they also may indicate shutdown due to malfunction of the communication status.

■ Messages of Automatic Stop Display and Automatic Restart Display

　 When the DSP air compressor has automatically stopped, the following screen is displayed, the AUTO START light

flashes/lights, and the RESTART message screen and details of contents flash on the LCD monitor.

● SCHEDULED STOP: Schedule operation setting　＜ AUTO light ON＞　 When schedule is set on the scheduled operation

screen, displays state of operation being stopped by

preset time. Operation starts automatically when the

preset restart time comes.

● LEAD/LAG OPERATION STOP (Note: applies only to machines equipped with two-

unit alternate operation.)　＜ AUTO light ON＞　 When the operation control mode is set to dual

or backup on the operation mode setting screen,

standby status of the slave machine in dual or backup

operation is indicated.

● DRYER PRESTARTED (Note: Applies only to machines equipped with a built-in dryer.)

　＜ AUTO START light flashes＞　 When dryer prestart is set, the dryer starts operat-

ing in advance, and compressor stopped status is

indicated.

　RESTART WAIT time is counted down.

● AUTO OPERATION (Note: Applies only to machines equipped with AUTO function)

　＜ AUTO START light ON＞　 Indicates status stopped by low load when set to

AUTO operation. AUTO START light flashes during

restart limit while stopped, and RESTART WAIT time is counted down.

● INSTANT STOP / RETRY (Note: Retry applies to V type only.)

　＜ AUTO START light flashes＞　 Displays status of restart for instantaneous power

interruption (IPI) restart and V type retry.

　RESTART WAIT time is counted down.

18


It takes maximum 50 seconds from AUTO STOP (when AUTO setting is valid) to restart for V type.

IMPORTANT

■ Maintenance Notice Messages

A maintenance date is determined by the amount of total operating hours or an elapsed calendar period, whichever

comes first. When the maintenance date or time arrives, the maintenance notice message appears on the display

under the heading of MAINTenance.

This function is an alarm display only, and does not output alarm externally.

Replace suction throttle valve consumable parts when inspection maintenance is displayed or the 1 million unloader

count alarm is given, whichever comes first.

NOTES:1. MAINTenance can be reset, if the servicing is done earlier than expected and if the remaining operating time to next maintenance

is less than 1,500h2. On the contrary, if the servicing is done after the maintenance notice has appeared, the remaining operating hours to the next main-

tenance has been zero until the maintenance is done. After maintenance and resetting the counter, new counting time starts just after the maintenance notice message has appeared on the display.

If the inspection/maintenance is displayed, check the display contents, refer to maintenance standards given in the compressor instruction manual and perform inspection/maintenance as soon as possible.When inspection is complete, press and hold the SET button for at least 7 seconds.The LCD monitor display contents then move to “Maintenance initial value completed” of the message screen, and then return to the monitor screen 1 minute later.

(1) SWITCHED TO LOCAL.

If set to local by remote operation following shut-

down restoration, operation automatically returns

to local when shutdown occurs, and the message

is displayed for 1 minute. For setting details, see

“3.4 How to Use the Digital Monitor.” ( page 25)

(2) IN OVERRIDE MODE.

This message blinks when the DSP is in an over-

ride mode.

■ Other Messages

(3) UNLOAD STOP

If the UNLOAD STOP button is used, the display

flashes. The compressor unloads for 5 minutes

and then stops.

CAUTION

Every these calendar periods: Service the DSP according to the schedules:

0.5 years, 1.5 years, 2.5 years

3.5 years, 4.5 years, 5.5 yearsHalf-Yearly

1.0 years, 5.0 years Yearly + Half-Yearly

2.0 years, 4.0 years 2-Yearly + Yearly + Half-Yearly

3.0 years 3-Yearly + Yearly + Half-Yearly

6.0 years (for overhauling) 6-Yearly + 3-Yearly + 2-Yearly + Yearly + Half-Yearly

A Standard Maintenance Schedule (A) (for yearly 8,000-or-less operating hours)

B Standard Maintenance Schedule (B) (for yearly 4,000-or-less operating hours)

（1）（2）（3）

19


3.3.4 How to Move within a Menu Display and to Change a Settingー [FUNCTION MENU] and [MAINTenance DATA MENU] ー

　The method and procedure for altering settings is displayed using the following as an example.

① Press the MENU button displayed on monitor

screen 1 – 2.

② Select the number of the item to be set with the

△ ▽ buttons.

③ Enter with the SET button. The display then switch-

es to the detail setting screen for that item.

The following explanation uses [2. Operation Mode Setting Screen] as an example.

How to Move within a [FUNCTION MENU] Display1

How to Select or Change a Setting within a Setting Display2① When the display switches to the details screen,

move to the line to be altered with the △ ▽buttons.

② Move to the item to be altered with the ▽ button.

③ Alter the setting value with the △ ▽ buttons.

④ After altering the setting value, press the SET but-

ton. The cursor moves to the number.

⑤ Press the SET button again.

　 The cursor moves to the first number at the top of

the screen and the setting contents are entered.

When setting is complete, pressing the MONITOR but-

ton once returns the display to the MENU screen, and

pressing it again returns to MONITOR screen 1.

The same procedure is used to alter settings for other

menus.

When altering settings of the LCD screen, number update by button operation is slow. Press the buttons slowly when altering settings.

IMPORTANT

Items with a dash next to their number cannot be altered on the LCD monitor. In this case, alter from the digital monitor while referring to the instructions manual for the compressor.

IMPORTANT

①

③

④

⑤

②

20


3.3.5 [FUNCTION MENU] － Setting Displays

Confirm settings by compressor alternate operation

specifications and multiple unit control (communica-

tion support). Wiring must be supplied separately for

use. Items for which a dash is displayed next to their

number cannot be set on the LCD monitor.

1. Operation control: Set operation control is dis-

played on the digital monitor.

2. LEAD/LAG operation time: Time setting for

alternate operation of a pair of compressors (set-

ting range: 0.1 – 99.9 hours; initial value: 8.0)

3. Switching conditions: Setting of conditions for

switching operation between a pair of compressors

4. Switching time: Switching time setting if switch-

ing conditions are “parallel” or “interval” (setting

range: 5 – 300 seconds, initial value: 15)

①②③④⑤⑥⑦⑧⑨⑩

If using the backup function, switch to the digital moni-tor and set.

Model Setting Confirmation 1

Operation Mode Settings2

The starter of settings can be confirm the software, model and setting status of model-specific settings such as capacity control. (Double asterisks are displayed for settings that do not require confirmation.)

① Indicates board software version.② Indicates compressor type.③ Displays cooling type.④ Displays the number of compressor stages.⑤ Displays pressure specification.⑥ Displays interstage pressure.⑦ Indicates CT setting value.⑧ Displays water failure detection conditions for water

cooled compressor.⑨ Displays status of instantaneous power interruption

(IPI) restart setting.⑩ Displays compressor number. (Must be distinguished

by number is using communication function.)

The screen provides the model and serves as a target for setting status. Check the screen when making an inquiry.

IMPORTANT

IMPORTANT

Altered setting values can only be entered when the com-pressor is not running.

IMPORTANT

5. BACKUP: Setting of pressure to start the backup

compressor when set to backup operation (range:

0.00 – 0.50 MPa, initial value: 0.05, difference from

control pressure in the minus direction).

6. UNLOAD: Pressure setting that manually unloads 1

unit when the preset pressure is reached in backup

operation (range: 0.00 – 0.50 MPa, initial value: 0.02, dif-

ference from control pressure in the minus direction).

7. DUAL TIME: Displays time remaining until switch for

dual / backup operation. Time is not counted down

when operating 2 units for backup operation. When

operation is stopped, remaining time is maintained.

8. SPEED CONTROL MODE: Displays control mode of V

type. An asterisk is displayed for the Fixed speed type.

Single Operates compressor independently.

STPRMultiple

unit

Case where multiple unit control is executed by communication function of multi roller EX (dedicated panel of NEXT Series). Unit control is executed by RS485 communication according to the settings. Requires separate setting of compressor number.

DualOperation alternates between a pair of compressors for a preset amount of time. AUTO light lights.

BackupOperation mode that adds pressure backup function to dual operation. When pressure drops, the slave machine starts. AUTO light lights.

OVER LAPMethod whereby first compressor is stopped after switching time for the other unit in parallel operation when it is time for dual operation.

IntervalMethod of operating the other compressor after stopping the first one after switching time when it is time for dual operation.

21


（）

If “SCHEDULE” is set, the AUTO light lights. If there is no valid setting for time, the AUTO light flashes. Altered set-ting can only be entered when the compressor is not run-ning.

Scheduled operation can be set for 1 day (standard

equipment).1. TYPE: Displays setting data for capacity control.

① Control settings set by the digital monitor can be

confirmed.

Fixed speed type: I (load/unload operation)/IP (AUTO

operation specifications ＊ optional)

V type: VB (AUTO function off)/ VA (AUTO opera-

tion specifications)

② Setting type of pressure set by the digital monitor

can be confirmed.

SETTING 1: Standard pressure setting;

SETTING 2: 2nd pressure setting

EXT: External load/unload setting

AUTO: Switches setting 1 and setting 2 by time.

③ Sets optional conditions. With standard specifica-

tions, displays “ordinary” characters.

2 - 3. OPTION: Used for options.

4 - 6. PRESSURE SETTING: Pressure settings set by

the digital monitor, target pressure and time limit can

be confirmed all at once on the LCD monitor. ④

7. TIME LIMIT: (Fixed speed type only)

Preset time limit can be confirmed.

The time limit is effective when ECOMODE (energy

conservation mode) is selected by pressing and hold-

ing the DISPLAY SWITCH button for at least 7 sec-

onds. The function sets energy conservation mode until

control pressure (unload start pressure) drops to the

target value if the load and unload repeat time clears

the time limit. If control pressure and recovery pres-

1. to 5. : Five Start/Stop Time Patterns ･ START: Starting Time

･ STOP: Stopping Time

･ Y or N :Yes starts or stops as scheduled.

2. DATA MEASUREMENT TIME: Time for recording

operation data twice a day can be set.

Recorded operation data can be confirmed by the “5”

operation data record screen.

Capacity CONTROL SETTING Display3

Schedule Setting4

If the time limit is altered, consult with your dealer or the Hitachi Service Station given on the rear cover.

IMPORTANT

IMPORTANT

1. MODE: Scheduling Mode

The display shows an example setting of scheduled opera-tion from 7:00 to 20:00. “19:07” indicates the current time

① ② ③

④

⑤

⑥

sure change time is measured and it exceeds the time

limit, control pressure is lowered so the time limit is no

longer exceeded. ⑤(Time limit range: 30 - 120 seconds; initial value: 30 sec-

onds)

8. USE TIME: Sets time to use pressure of setting 2. At that time, it displays automatic at the position of (2)

of the type. When start and stop time become the same

value, the automatic display is returned to setting 1 and

the function is stopped.

OFF Operates the DSP without a schedule.

SCHEDULEDOperates the DSP according to a daily 24- hour calendar.

Settings are selectable when the DSP is in a stop.

IMPORTANT

Screen for confirming pressure settings for capacity

control. Pressure settings are set from the digital moni-

tor. Pressure settings consist of setting 1 and setting 2,

which can be used by setting time used.

22


① Operation state is indicated by a symbol next to the

shutdown code.

L: Load, U: Unload, S: Stop

Displays alarm contents and code, date, time, state and

how many times alarm occurred. If the same alarm

continues to occur, it is overwritten as update data,

and the number of times the alarm occurs is updated.

The latest warning is recorded as item 1. If there is no

alarm, asterisks are displayed. The screen displays data

for 3 types, and the necessary data can be confirmed by

△ ▽ button operation.

①

Up to 6 items of alarm history are recorded aside from

shutdown history. Contents and occurrence state can be

confirmed. Select the number of the shutdown on the SHUTDOWN HISTORY screen, press the SET button

and the operation state when the shutdown occurred

can furthermore be confirmed on the details screen.

● How to clear shutdown and alarm history.

　 If you want to clear the entire shutdown history and

alarm history, set F041 from the F mode of the dig-

ital monitor to “1: CLEAR HISTORY” while referring

to the instructions manual of the compressor.

Operation Data Display5 Alarm History7

Load Data Display6

Shutdown History Display8

Records date/time, pressure, current, temperature and load status at that time as operating state recorded by data measurement time. Up to 12 times can be record-ed, after which the oldest data is deleted one at a time; the latest data is displayed for item 1. The screen shows record for 2 times, and the necessary data can be con-firmed by △ ▽ button operation. If altered before time is up, the data prior to change is main-tained, and the time recorded as soon as the data is altered changes.1. and 2. - :Indicates the MONTH / DAY HOUR: MINUTE.P - Represents a pressure (MPa) and indicates, from left

to right, the: Discharge air pressure, pressure data.C - Current (A).T - Represents a temperature （℃） and indicates from

left to right: 1st stage discharge air temperature, 2nd stage discharge air temperature.

L - Represents a load ratio percentage (%). and out put (kW).

If there is no data, an asterisk is displayed.

This display shows the averaged load data per day. Data can be recorded for a maximum of six days; the 7th day of averaged loaded data is automatically deleted and the 1st or most recent day of averaged data is added. The most recent data is arranged at the top of the display.The screen shows record for 2 times, and the neces-sar y data can be confirmed by △ ▽ button operation. Data is averaged from operation start to stop. The average is however fixed at 0.00 minutes in the case of 24 hours operation.

If an alarm occurs on the digital monitor, shutdown

history is recorded. Up to 6 items of alarm history

however can be recorded aside from shutdown history.

Contents and occurrence state can be confirmed.

23


3.3.6 Other Hardware Setting

Adjust the LCD brightness as follows:

To brighten:

Hold down the SET button and press the

MONITOR button.

To darken:

Hold down the SET button and press the

FUNCTION button.

The calendar and clock are set by Hitachi prior to

delivery. To reset the calendar and clock, please

contact the local Hitachi distributor.

The following is a table of contents that can be set by

the LCD monitor and digital monitor (next section).

1 Initial Setting

The language of the display can be switched to

Japanese, English or Chinese by the dip switch on

the back of the LCD monitor board. If the language

needs to be changed, consult with the local Hitachi

distributor.

4 3-Language Display Switch

2 Brightness Adjusting

3 Digital Monitor Operation Classification

Bit 1 2 3 4～ 8

Japanese setting OFF OFF

Not usedEnglish setting ON OFF

Chinese setting OFF ON

Test mode ON ON

Power must be turned off before changing setting.

Function Item LCD monitor oper-ation

Digital monitor (F mode) Remarks

Operation Mode Screen

Mode － ○　F000 Dual, backup, etc.Dual operation time ○

－

Switch conditions ○Switch time ○Backup pressure ○ Differential pressureUnload ○ Differential pressureDual operation remaining time △ (AUTO change)Speed control mode

－○ (Factory set) V type only

Capacity Control Screen

Type (Left: Capacity control) ○　F019 Example: I type (load/unload type)Type (Center: Setting type) ○　F018 Example: Setting 1Type (Right: Function) ○

－Option (not supported)

Pressure loss ○ Option (not supported)Total piping capacity ○ Option (not supported)Control pressure

－

○　F022～ Setting 1, Setting 2Recovery pressure ○　F022～ Setting 1, Setting 2Target pressure ○　F022～ Pressure differentialTime limit ○ (Factory set) Energy saving mode decision timeSetting 2: Use time ○

－Scheduled Operation Screen

Contents ○ Function switchStart/stop time ○Data measurement time ○ Operation data measurement

Other Settings Compressor No. setting

－

○　F001Instantaneous power interruption (IPI) setting ○　F002～Remote operation setting ○　F005～Dryer operation setting ○　F008～AUTO operation setting ○　F011～Energy saving mode setting ○ Display switch button operation

Reset Shutdown/alarm reset ○ Reset button operationLoad count reset ○ Remote + display switch buttonMaintenance reset ○ － Set button 7 sec. ONShutdown/alarm history clear － ○　F041

24


3.4 How to Use the Digital Monitor3.4.1 How to display operation status, shutdown history, and status of various settings　 All display contents of the digital monitor are linked with the LCD monitor. All of the following display contents can

be can be confirmed by the LCD monitor.

　 Use the following operations to display the contents of other operation/setting status on the LCD monitor and simply

confirm operation status and setting status by the digital monitor.

(1) How to Display the Operation Status

When the power is turned on, discharge pressure is displayed

on the screen of the digital monitor. Use the following proce-

dure to switch the digital monitor to other display.

① Press the SWITCH DISPLAY button. Operation time is

then displayed on the screen.

② Press the SWITCH DISPLAY button. Interstage pressure

is then displayed on the screen together with “b.”

③ Press the SWITCH DISPLAY button. Compressor dis-

charge temperature is then displayed on the screen togeth-

er with “C.”

④ Press the SWITCH DISPLAY button. Load rate is then dis-

played on the screen together with “L.”

⑤ Press the SWITCH DISPLAY button. Load count is then

displayed on the screen in units of 10,000 times together

with “U.”

　 Each time the SWITCH DISPLAY button is subsequently

pressed, it continues on to (2) Display of shutdown history

and (3) Monitor display of various settings. To return one

item at a time, press 2 . To return to discharge pres-

sure, press RESET.

● If the alarm or shutdown light is flashing, the shutdown

code is displayed along with “E0” ( page 35, 36).

“E0” indicates the contents of the latest shutdown.

● If the alarm or shutdown light is flashing, it indicates that

the alarm or shutdown has not been reset. Check E0.XX

and reset.

リセット

To shutdown history display

b ： Interstage pressure (MPa)

P ：Discharge pressure (MPa)

Operation time (×10)Flashes when operation time is added.

L ： Load rate （%）

U ： Load count （×10,000 times）

H ： Not used (display only)

表示切替１

2

Press SWITCH DISPLAY.

d ： Not used (display only)

C ： Compressor discharge temperature (°C) （50℃）

Proceeds by 1 each time pressed.

Returns by 1 each time pressed.

Returns to discharge pressure.

IMPORTANT

1. When other than P0.00 is displayed, automatically returns to P0.00 discharge pressure display in 3 min-utes.

2. Load rate is a reference value determined by com-putation.

25

3. OPERATING THE DSP [How to Use the Digital Monitor]

SWITCH DISPLAY

Press 8 times.

[1 prior shutdown]

[Local shutdown]

［Oldest shutdown］

１

Discharge pressure display

History consists of 6 items.

Not used (display only)

To display of various settings

XX ： Shutdown code

リセット

表示切替１

2

Not used (display only)




(2) How to Display Shutdown HistoryUse the following procedure to display shutdown history on

the screen.

① Press the SWITCH DISPLAY button 8 times. “E0.” is the

displayed together with the shutdown code ( page

35, 36). “0” indicates the latest shutdown. (Automatically

changes to “E.0” when shutdown or alarm occurs.)

② Press the SWITCH DISPLAY button. “E1.” is then dis-

played along with the shutdown code. “1” indicates shut-

down that occurred previously. Six items of data from 0 – 5

are recorded. “E5” indicates the oldest shutdown.

③ Press the RESET Button. The screen then returns to the

usual digital monitor display.

IMPORTANT

If the shutdown code “XX ”is “ ” it means there is no shutdown history. Also, when anything other than shut-down history is displayed without resetting shutdown, it returns to the latest shutdown history in 3 minutes.

SWITCH DISPLAY

Press 16 times.

Discharge pressure display

A ： Capacity control typeNo.0 ： Control status

No.1 ： Start pressure 1 070 ： 0.7MPa

No.2 ： Recover pressure 1 060 ： 0.6MPa

No.5 ： Start pressure 2 070 ： 0.7MPa

No.8 ： Instantaneous power interruption (IPI) setting

000 ：

No.9 ： Compressor address 001 ： No.1

No.6 ： Recover pressure 2 060 ： 0.6MPa

No.7 ： Pressure differential 2 005 ： 0.05MPa

No.3 ： Pressure differential 1 005 ： 0.05MPa

リセット

１

表示切替１

2

No.4 ： ECOMODE ［Energy conservation mode］ Decision time




Invalid

(3) How to Display Various Settings (Perform operation only when confirmation is necessary.)

Use the following procedure to display capacity control type

and pressure setting values for confirmation.

① Press the SWITCH DISPLAY button 16 times. “0.A＊＊ ”

is then displayed on the screen. ＊＊ changes with specifi-

cations. “A” may be “L” or “U” depending on capacity con-

trol specifications.

② Consists of items 0 - 9. Pressure setting status and

optional pressure setting 2 can be confirmed each time the

SWITCH DISPLAY button is pressed.

③ Press the RESET Button. The screen then returns to the

usual discharge pressure display.

IMPORTANT

Symbol displayed at No. 0 and corresponding capacity control type

A: AUTO function settingL: Fixed speed type setting (INTE … Load/unload operation)U: V type AUTO function off setting

For details on the various types, see pages 22 and 64 - 68.

26


3.4.2 How to Set Control Functions

■ Various settings (instantaneous power interruption (IPI), remote operation, capacity control setting, pressure setting, etc.)

Switches display from monitor mode to setting mode (F mode).

１

１ 2

１

2

リセット

表示切替

For details, see the F mode table.

To alter settings, change the values with the

　　　　　　buttons. ( page 28)

Displays 000th item of F mode.

Changes each time FUNCTION is pressed.

Forward

Back

Press ENTER to enter the settings.

Back

Press and hold simultaneously for at least 3 seconds.Perform same operation to return.

Displays setting contents.F000：（0： Sets single unit operation.）

F000：（1： Sets multiple unit control.）

27


Settings can be altered or entered into the memory from the digital monitor without opening the start panel.

Function7 segment

displayItem Range

Precision/unit

Initial value

Multiple unit control setting F000 Control setting 0～1 1 00： Single operation, 1: Multiple unit

control (communication supported)

Instantaneous power inter-ruption (IPI) restart setting

F002Instantaneous power inter-ruption (IPI) setting

0～1 1 0 0：ON、1：OFF

Remote operation set-ting

F005Remote control switch method

0～3 1 00：Panel setting, 1：Local fi xed,2：Remote fi xed, 3： Remote switch signal

F006 Remote operation method 0～1 1 0 0：Pulse input, 1：Level input

F007Remote operation shut-down recovery

0～1 1 0 0：Disable, 1：Enable

AUTO setting (*2) F011 AUTO operation enable 0～1 1 0 0：Enable, 1：Disable

Capacity control F018 Control pressure selection 0～2 1 00：Setting 1, 1：Setting 2,

2：External input

Function setting (optional)

F021 Pressure control mode 0～2 1 00：Built-in sensor, 1：External contact,2：External input

0.7

/ 0.9

3 M

Pa

spec

ifica

tions V type

Pressure setting 1※

F022Control pressure setting 1

(control pressure)0.5～0.70 0.01MPa 0.70（0.93）

※ Setting can be altered at any time.

F023Start pressure 1

(cut out pressure)0.5～0.72（0.95） 0.01MPa 0.72（0.95）

F024Recovery pressure 1

(cut in pressure)0.5～0.68（0.91） 0.01MPa 0.67（0.90）

F025（＊2）P type recovery pressure 1

(restart pressure)0.5～0.68（0.91） 0.01MPa 0.67（0.90）


F031Control pressure setting 2

(control pressure)0.5～0.70 0.01MPa 0.70（0.93）





F034（＊2）P type recovery pressure 2

(restart pressure)0.5～0.68（0.91） 0.01MPa 0.67（0.90）

Standard type




※ Setting can be altered at any time.








Shutdown history clear F041（＊1）History clear 0 ～1 1 0 0：Enter, 1：History clear

Note:

※ Setting can be altered at any time other than this.＊1：When set to 1,” history is cleared. After clearing, the value is automatically reset to “0.”＊2：Only the V type is equipped with AUTO function. The AUTO function is available as an option for the Fixed speed type.

　　 Do not alter settings for any F items not given in the table.

IMPORTANT

1. Pressure setting V type: Set pressure differential of start pressure and recovery pressure to a minimum of 0.05 MPa when using a standard

receiver. Set Pressure differential of start pressure and control pressure to a minimum of 0.02 MPa. Fixed speed type: Set pressure differential of start pressure and recovery pressure to a minimum of 0.1 MPa.2. Function for switching to pressure setting 2 by external pressure alteration input is optional.

28


3.4.3 Alteration of Pressure Setting ValuesUse the following procedure to alter the pressure set-

ting values for the capacity control system.

① Switch from monitor mode to setting mode (F

mode).

② Set PRESSURE SETTING 1 of F mode.

　 (For detailed contents of setting specifications, see

page 28.)

　 If using pressure setting 2, you must also set pres-sure setting 2.

For operation method, be sure to refer to the vari-

ous settings, and after entering the setting values

with the STORE button, return to the monitor

mode.

１

2

機能

記憶

Pressure setting 1

Alter values.

Press button.

Press button.

3.4.4 Capacity Control Mode Setting and Confirmation

機能

記憶

１

2

AUTO setting

Alter values.

(Initial value 0)

Press button.

Press button.Set to AUTO OFF.

IMPORTANT

The AUTO function is available for the Fixed speed type as an option.

You can switch the capacity control mode by the follow-

ing method according to the application. The V type is a

automatic stop type, but can also be changed to control

mode that does not stop automatically (AUTO OFF).

Capacity control mode setting can be changed by

switching the digital monitor from monitor mode to

setting mode (F mode) while the compressor is not

running and setting to “0: Enable” or “1: Disable” by

altering the AUTO setting (F011) of F mode.

Capacity control mode AUTO ON AUTO OFF

F011 0 : Enable 1 : Disable

Digital monitor display 0．AＸ X 0．UＸ X

After altering, confirm the capacity control mode by

display of various settings on the digital monitor (

page 25).

（ For capacity control operation and details, see

pages 31 and 64 - 68. Pressure for control can also

be switched by F018 (pressure setting 1 / pres-sure setting 2).

29


3.4.5 Remote Operation Setting

ＲＥＭＯＴＥ遠　方

On

On

Flashing

Off

(1) Remote setting by instrument panel

(2) Remote setting fixed

(3) Remote setting by external operation button

Local setting

機能

記憶

１

2

Alter values.

(Initial value 1)

Remote operation switch method

Press button.

Press button.Set to remote fixed.

Operation mode is basically switched by panel opera-

tion. The remote operation mode can also be set by

methods (2) and (3).

① Turn off the main power supply.

② Remove the front cover and remove the start panel

cover.

③ Connect the wiring of the remote control panel and

the compressor control panel.

　( See the wiring diagrams on pages 52 - 56.)

④ Mount the start panel cover and the front cover.

⑤ Turn on the main power supply.

[1] To “set the operation buttons of the instrument panel to remote operation mode”

① Press the REMOTE button.

② The REMOTE light lights to indicate that operation

of the instrument panel buttons is set to the remote

operation mode.

③ To retur n to local operation mode, press the

REMOTE button again. The REMOTE light then

goes off to indicate that operation has been switched

to the local operation mode.

[2] To “fix remote operation to remote operation mode”

① Switch from the monitor mode to the setting mode

(F mode).

② Change the remote operation switch method for

remote operation setting (F005) from “0: Panel set-ting” to “2: Remote fixed.”

③ The REMOTE light lights to indicate that the remote

operation mode has been set.

[3] To “set to remote operation by operation button provided externally”

(Consult with your dealer or the Hitachi Service

Station.)

① Wire the external remote setting buttons.

② Switch from the monitor mode to the setting mode

(F mode).

③ Change the remote operation switch method for

remote operation setting (F005) from “0: Panel set-ting” to “3: Remote switch signal.”

④ Set the external remote setting button to “ON.”

⑤ The REMOTE light flashes to indicate that the oper-

ation mode has been switched to remote operation

by external buttons.

IMPORTANT

● In the case of multiple unit control specifications, when multiple unit control is set, it automatically changes to the remote setting. The REMOTE light flashes at this time.

● Remote operation method alteration in the setting mode can only be entered when the compressor is not operating.

● The compressor STOP button can also be used to stop operation when operating in the remote mode.

30


3.4.7 Capacity Control Flow when ECOMODE (Energy Saving Mode) is Set(ECOMODE is set to off when shipped from the factory, but may be set according to your needs.)

ＲＵＮＮＩＮＧ　ＣＯＮＴＲＯＬ運転管理

ＡＬＡＲＭ

警　報

１記　憶

遠　方ＲＥＭＯＴＥ

表示切替／ワイドモード

ＳＴＲ

機　能ＦＵＮＣ

リセットＲＥＳＥＴ

ＳＥＬＥＣＴ／ＷＩＤＥ

１


ON ： Light flashes. OFF ： Light goes off.


表示切替／ワイドモードSet by button

Execute capacity control in accordance with the follow-

ing time charts.

(1) ECOMODE (Energy Saving Mode) setting

When you set to ECOMODE by load/unload type

control, if the cycle time for load → unload exceeds

30 seconds, the start pressure setting is automati-

cally lowered until it reaches recovery pressure +

0.05 MPa to conserve energy.

If 30 seconds is exceeded, the DISPLAY SWITCH / WIDE MODE light flashes; if 30 seconds is not

exceeded, the DISPLAY SWITCH / WIDE MODE light lights steadily, and control is executed by pres-

sure setting value of ordinary load/unload type con-

trol.

When using ECOMODE (Energy Conser vation

Mode), “ECO” is displayed on the monitor screen.

( page 16)

(2) Precautions when using ECOMODE (Energy Saving Mode)

Enabling ECOMODE (Energy Conservation Mode)

requires an air tank that is one turn larger that the

air tank recommended for load/unload type control.

( For information concerning the air tank, see

page 42.)

This function is used for load/unload type control,

and operates only for the ordinary pressure setting.

Line

pre

ssur

e

Energy Saving Effect

Load Unload

Time

Start pressure(Unload start pressure)

Recovery pressure(Load recovery pressure)

Recovery is automatically

reduced.

: 0.1MPa: 0.05MPa

Factory set upper/lower limit pressure differentialECOMODE differential pressureStart pressure is automatically reduced to 1 cycle per 30 seconds.

※ Start pressure = Cutout pressure※ Recovery pressure = Cutin pressure

According to alteration of the pressure setting value of

section 3.4.1, by setting start pressure 2 (value of F032)

and recovery pressure 2 (value of F033), the control

setting can be easily switched by external button opera-

tion in accordance with usage time on the load side.

During ordinary control, the LOAD light is lit when

loading and goes off when unloading. With pressure setting 2, however, the light flashes when loading and

goes off when unloading.

If using this function, consult with your dealer or the

Hitachi Service Station. (The ECOMODE however can-

not be used with pressure setting 2.)

Pressure setting 2 selection (flash range)Ordinary (on range)

ONOFFExternal pressure setting switch

Time

Energy Saving Effect

Load Unload

Start pressure 2

Recovery pressure 2

Start pressure 1

Recovery pressure 1

Line

pre

ssur

e

Load light

※ Start pressure = Cutout pressure※ Recovery pressure = Cutin pressure

31


3.4.6 Pressure Setting Switch Function(Can be supported as an option)

CAUTION

3.5 Daily Operation

① Turn on the main power supply.

② Check the POWER light and LCD monitor display.

– Is the light lit ?

– Is the monitor screen displayed on the LCD monitor?

③ Check the level of lubricating oil.

– Is the oil level near the red line ?

④ Set the water drainage cock valve of the cooling

water piping and the water drainage cock on the

rear of the compressor to “fully closed.”

⑤ Allow cooling water to pass through.

① Open the discharge side valve.

② Start operation by pressing the START button.

③ Check the pressure after the compressor starts up.

　 – The compressor stops running if the oil pressure does not

rise to at least 0.08 MPa.

　 – The compressor switches to full load operation within 15

seconds for the Fixed speed type and within 10 seconds for

the V type.

④ Make sure the discharge pressure rises gradually.

　 – Make sure the maximum pressure does not exceed the

specified discharge pressure.

● When using the DSP air compressor, do not raise the discharge pressure excessively. Operating the DSP air compressor over the rated pressure can result in main motor overload, shutdown of the air-end and/or damage of parts.

● If the safety relief valve has blown or a protective device has shutdown the DSP air compressor, investigate the cause of and take corrective action. If there any questions or comments in taking these actions, please contact the local Hitachi distributor.

③


ＲＵＮＮＩＮＧ　ＭＯＤＥ

ＡＬＡＲＭ

警　報

運転状況

故　障

ＬＯＡＤ

ＳＨＵＴＤＯＷＮ

ＲＥＭＯＴＥ

負　荷

遠　方電　源ＰＯＷＥＲ

起動待ちＡＵＴＯ　ＳＴＡＲＴ

停　止ＳＴＯＰ

運　転ＳＴＡＲＴ

１２記　憶



ＳＴＲ




②

UNLOAD STOP

3.5.1 Preparing the DSP Air Compressor

Water-Cooled

DIS. PRESS：０．７０ＭＰａ

INTSTG. P：０．１５ＭＰａOIL PRESS：０．１５ＭＰａCLT PRESS：＊．＊＊ＭＰａ

[Rear View]

②

③④

①



ＡＬＡＲＭ

警　報

運転状況

故　障

ＬＯＡＤ


ＲＥＭＯＴＥ

負　荷





１２記　憶



ＳＴＲ




UNLOAD STOP

3.5.2 Starting the DSP Air Compressor

Make sure the oil level of the lubricating oil is between the red lines while the compressor is running. Because lubricating oil is circulated through the cooler and the pip-ing while the compressor is running, the position when the compressor is running and when it is off differs, and is higher when the compressor is not running.

IMPORTANT

32

3. OPERATING THE DSP [Daily Operation]

① Check the LCD for operating pressures and tem-

peratures, and verify that:

　 – Discharge air pressure, interstage air pressure, oil pres-

sure, discharge air temperature, 2nd-stage suction air tem-

perature, and oil temperature stay within a normal range;

see page 47

② Make sure air containing drain from the inter cooler

drain discharge por t and after cooler drain dis-

charge port is intermittently discharged.

① Press the UNLOAD STOP button. The compressor

then unloads for 5 minutes and then stops running.

(In the case of an emergency, press the STOP but-

ton.)

② Check the LCD for pressures, and verify that:

- Oil pressure, interstage air pressure, 0 MPa (or 0.01 MPa

depending on your operating conditions).

③ Drain the condensate through the control line filter’s

condensate drain valve. （Fixed speed type）

④ Close the discharge stop valve.

⑤ Stop the cooling water. Open the valve for drain-

ing water in the cooling water piping and drain the

cooling water. To avoid damaging the casing and

cooler, be careful not to allow freezing during the

winter.

モニタ


遠方

機能

電源

運転停止

運転状況

故障

運転管理

負荷

遠方

起動待ち

設定

自動

UP/　DOWN

警報

記憶


＋／－

AUTO

MONITOR

MENU

SET

SELECT/WIDE

2

RUNNING CONTROL

STARTREMOTE

1

FUNC

［× 10h］

ALARM

STR

REMOTE

RUNNING MODE

AUTO START

POWER

LOAD

RESETSHUTDOWN

STOP

MONITOR

UNLOAD STOP

[Rear View]

②

④

③



ＡＬＡＲＭ

警　報

運転状況

故　障

ＬＯＡＤ


ＲＥＭＯＴＥ

負　荷





１２記　憶



ＳＴＲ




UNLOAD STOP①



3.5.3 During Operating the DSP Air Compressor

3.5.4 Stopping the DSP Air Compressor

Water-Cooled

33

3. OPERATING THE DSP [Daily Operation]

3.6 Oil Mist Remover Daily Operation

3.6.1 When Starting

3.6.2 When Stopping① Make sure that the vacuum indicator shows a red

mark.

② Verify that the pressure gauge reads 0 (zero).

φ8

Make sure that the pressuregauge reads as follows:

Pressure Gauge0.35 to 0.38 MPa

Make sure that the condensate is not collected in the filter bowl.If the condensate is collected, push up the cock to drain the condensate.

Make sure that the vacuum indicator does not show a red mark.

Condensate Drain Cock

If the oil pressure is reduced to 0.08 MPa or lower, the oil pres-sure sensor will detect it and shut down the DSP air compressor.

① Use the relief valve to regulate the oil pressure. To regulate the oil pressure, open the relief valve cap, loosen the lock nut, and turn the regulating bolt to keep the oil pressure at the specified 0.12 to 0.16MPa.

・ 0.12 to 0.16 when the ambient temperature is 20 degree C or higher.

・ 0.14 to 0.18 when the ambient temperature is 20 degree C or lower.

(for V type, adjust at the maximum operating frequency.)

② Turn the regulating bolt clockwise to increase the oil pressure and vice versa.

③ Tighten the locknut and replace the cap.

IMPORTANT

Relief Valve

3.7 Adjusting the DSP

3.7.2 Regulating the Oil Pressure

Locknut

Seal Washer

Air Intake Filter

Usually keep the bolt tightened, but not excessively.

Adjusting Bolt (Suction Bypass Valve)

Suction Throttle Valve

①④

②④

③

② The first steps to resolve the lower suction vacuum pressure are as following.

A) Clean or replace the air intake filter. B) Clean the suction throttle valve’s valve plate. Note; If the unloaded interstage pressure drops as

low as -0.08MPa, discharge air temperature will gradually increased.

③ If the DSP air compressor cannot be shutdown to clean these parts, turn the adjusting bolt (the suction bypass valve) counterclockwise to open. This will allow the air intake and increase the discharge air pressure to be geater than -0.08MPa when running unloaded.

④ Replace the consumable parts in the air intake fil-ter and suction throttle valve with new consumable parts in accordance with the appropriate mainte-nance schedule. For the detail refer to the sec-tion 9, Maintenance the DSP.

① When dust particles accumulate on the valve plate of the suction throttle valve, the suction vacuum pres-sure may drop and eventually causing the discharge air temperature to rise.

3.7.1 While Operating the DSP Air Compressor (Fixed speed type)

The interstage pressure of as low as -0.08 MPa during unloading period may increase the discharge air temperature.

IMPORTANT

34

3. OPERATING THE DSP [Oil Mist Remover Daily Operation, Adjusting the DSP]

4.1 Protective Devices

CAUTIONIf an alarming trouble or a shutdown trouble has happened, investigate the cause and take a corrective remedy before restarting.If you have anything unclear or any question, please contact the local Hitachi distributor.

The DSP is provided with the protective devices as listed below. Shutdown troubles and alarming troubles detected by

these protective devices are indicated on the liquid crystal display (LCD). Referring to the LCD indications, investigate

the cause of a shutdown or alarming trouble.

■ When Connecting the powerLCD Indication What and

How to DetectSHUTDOWN MODE Light Detector Shutdown What Actions to Take How to

ResetHistoryCodeHeading Trouble Description

PROBREM

Reversal phase connectionDetected for 3 seconds after connecting the power

Blinks in red

CPU Yes Change 2 of 3 wires of the power cord. Press RESET button. 01

Phase-lacking connection CPU Yes Reconnect the power cord tightly, check the power supply, and take a corrective remedy.

Press RESET button. 02

Short period Power Interruption Black out for 1 to 5 seconds−

CPU No See page for Power Interruption detection−

03

Instantaneous Power Interruption Black out for less than 1 seconds CPU No See page for Power Interruption detection 04

■ During OperationLCD Indication What and



SHUTDOWN

Discharge air tem-perature (1)[Fixed speed type]

The temperature detected at 1st stage rises above the below settings. Blinks

in redThermistor Yes See page 37.

Press RESET button.

550.70MPa model about 225℃

（about 215℃）0.93MPa model

Discharge air temperature (1)The temperature detected at 1st stage rises above the below settings. Blinks


Press RESET button.

550.70MPa model about 230℃

（about 220℃）0.93MPa model

Discharge air tem-perature (2)



Press RESET button.

560.70MPa model about 230℃（about 220℃）


Interstage pressure[Fixed speed type]

0.27MPa or higherBlinks in red

Pressure sensor Yes See page 37.Press RESET button.

52

Interstage pressure0.30MPa or higher

Blinks in red


52

2nd-stage suction air temperature

73(70)℃ or higher(after the intercooler)

Blinks in red

Thermistor Yes See page 37.Press RESET button.

5B

Oil temperature 73(70)℃ or higherBlinks in red

Thermistor Yes See page 37.Press RESET button.

58

Oil pressure[Fixed speed type]

0.08MPa or lowerBlinks in red


5C

Oil pressure (OIL-LOW PRESS)

Oil pressure descends under below settings. Blinks

in redPressure sensor Yes See page 37.

Press RESET button.

5CFreg. 45Hz or higher 0.08MPaFreg. less than 45Hz 0.04MPa

Overloading(main motor)

Detected during oper-ation

Blinks in red

Thermal relay Yes See page 37.Press RESET button.

17

Overloading(ancillary motor)

Detected during oper-ation

Blinks in red

Thermal relay Yes See page 37.Press RESET button.

53

Answer error of 52Detected during

running.Blinks in red

CPU Yes See page 37.Press RESET button.

51

Answer error of 42[Fixed speed type]

Detected after shifting to △ running.

Blinks in red

CPU Yes See page 37.Press RESET button.

16

FAILURE

INV STOP

Inverter tripping or main motor overloading with automatic retrials.

Failure signal from inverter

Blinks in red

CPUFailure stop after repetition of retrials.

See page 37.Press RESET button.

44

35

4. TROUBLESHOOTING

■ OthersLCD Indication What and



PROBLEM

Battery out Battery voltage lowBlinks in green

CPU NoDisconnect the power, and replace the battery with a new one.

Press RESET button.

64

Error of a scheduling operation

Start/stop time not set yet

Blinks in green

CPU No Check the operation setting.Press RESET button.

62

Error of a multiple-unit operation

Setting errorBlinks in green

CPU NoCheck the wire and the operation setting.

Press RESET button.

5B

Error of RS－485C port

Setting errorBlinks in red

Thermistor YesCheck the wire and the operation setting.

Press RESET button.

63 65～68

Error of RS－485 port

Setting errorBlinks in green

Pressure sensor YesCheck the wire and the operation setting.

Press RESET button.

63 65～68

FAILURE

PCB error

(ROM1) (RAM1)MAIN Memory failed

Blinks in red

CPU YesDisconnect and reconnect the power. If the problem is reproduced, change the PCB.

Press RESET button.

4142, 46

(ROM2) (RAM2)LCD Memory failed

Blinks in red

CPU YesDisconnect and reconnect the power. If the problem is reproduced, change the PCB.

Press RESET button.

4147, 48

CT error DisconnectedBlinks in red

CPU YesDisconnect the power and check the CT sensor wire for tightness.

Press RESET button.

E10

Pressure sensor(disconnection 1)

PS5 disconnected (sensor for interstage pressure)

Blinks in red

CPU Yes

Disconnect the power and check the pressure sensor wire for tightness.

Press RESET button.

33


PS2 disconnected (sensor for discharge air pressure)

Blinks in red

CPU YesPress RESET button.

34


PS4 disconnected (sensor for Oil pressure)

Blinks in red


39

Temperature sensor(disconnection 2)

TH2 disconnected (thermistor for interstage temperature)

Blinks in red


32


TH3 disconnected (thermistor for 1st-stage discharge temperature)

Blinks in red

CPU Yes

Disconnect the power and check the thermistor sensor wire for tightness.

Press RESET button.

35


TH4 disconnected (thermistor for 2nd-stage discharge temperature)

Blinks in red


36


TH5 disconnected (thermistor for oil temperature)

Blinks in red


37

NOTES:　1. Figures in ( ) are for water cooled models.　2. Both the DSP for a 400 V class power supply and the DSP with a control circuit of 100 volt employ a reversal phase relay.　3. Both the DSP for a 400 V class power supply and the DSP with a control circuit of 100 volt indicate a phase-lacking connection as a reversal phase.　4. Battery Replacement:　　 Use the Hitachi Maxell Button type Lithium Battery (model：CR2032WK17, with lead wire connector, 3V)　　 Replace the battery with a new one every 6 years. When replacing, disconnect the power and complete the replacement work within 15 minutes.　5. If a Thermistor is disconnected, an override operation is not allowed. Contact your distributor immediately.

■ During OperationLCD Indication What and



ALARM

Clogging of air intake fi lter

Pressure differential of －4.98kPa or more

Blinks in green

Pressure differential

sensorNo See page 76

Press RESET button.

21

Discharge air temperature (1)[Fixed speed type]


in greenThermistor No See page 37

Automatically reset.

250.70MPa model about 220℃（about 210℃）0.93MPa model

Discharge air temperature (1)The temperature detected at 1st stage rises above the below settings. Blinks

in greenThermistor No See page 37

Automatically reset.

250.70MPa model about 225℃（about 215℃）0.93MPa model

Discharge air temperature (2)

The temperature detected at 2nd stage rises above the below settings.

Blinks in green

Thermistor No See page 37Automatically reset.



2nd-stage suction air temperature

68(65)℃ or higher(after the intercooler)

Blinks in green


2B

Oil temperature 68(65)℃ or higherBlinks in green


26

L. COUNT OVER( Load/unload cycle count)

1 million timesBlinks in green

CPU NoReplace suction throttle valve consum-able parts and Blow off solenoid valves

Hold the REMOTE Button and SELECT/WIDE Button for at lease 7 seconds

59

36

4. TROUBLESHOOTING [Protective Devices]

4.2 Troubleshooting the Air Compressor4.2 Troubleshooting the Air CompressorMost likely problems, causes, and remedies are described below.

Causes LCD Indication Causes Corrective Remedies

The DSP motor does not start. ＜ P R O B L E M ＞

C O N N E C T I O N E R R ： R E V

P r e s s R E S a f t e r C H K .

1. Power supply switch - Off2. Power - Failed3. Power cord - In a reversal phase

connection4. Power cord - In a phase-lacking

connection

1. Check the main breaker.2. Check the power supply.3. Change 2 of 3 wires of the power

cord.4. Reconnect the power cord tightly and

check the power supply.NOTE: Phase-lacking is detectable only

when connecting the power.＜ P R O B L E M ＞

C O N N E C T I O N E R R ： O P E N


Shutdown –1st-stage discharge air temperature and/ or pressure too high

＜ A L A R M ＞

D I S . T E M P . 1 ：


1. 2nd-stage AIR END air intake effi -ciency - Lowered

2. Air intake fi lter - Dirty3. Temperature of Suction Air-High

1. Contact your Hitachi distributor.2. Clean the air intake fi lter.3. Lower the suction air temperature.

＜ S H U T D O W N ＞

H I G H D I S . T E M P ：


Shutdown –2nd-stage discharge air temperature too high

＜ A L A R M ＞

D I S . T E M P . 2 ：


1. Check valve – Compressed air leaked (from the aftercooler to the air end when the DSP unloads)

2. Suction throttle valve - Dirty [Fixed speed type]

1. Replace the check valve.2. Clean the Suction throttle valve. [Fixed speed type]Note: For information about the Suction

bypass valve, see page 29.

Shutdown –2nd-stage suction air temperature too high


2 N D S U C T . T E M P ：


1. Cooling water pump – Failed, or Cooling water pressure – Fluctuating

2. Intercooler – Dirty

1. Check the cooling water system.2. Clean the intercooler

Shutdown –Oil temperature too high ＜ S H U T D O W N ＞

O I L ： H I G H T E M P


1. Oil cooler – Dirty2. Room temperature – High3. Oil temperature control valve –

Failed

1. Check the oil cooler.2. Reduce the room temperature.3. Check the oil temperature control valve.

Shutdown –Oil pressure too low ＜ S H U T D O W N ＞

O I L ： L O W T E M P


1. Oil strainer and/or oil fi lter – Dirty2. Oil level – Low

1. Clean the oil strainer2. Replace the oil fi lter.3. Add the oil.

Shutdown –Main motor and/or ancillary motor overloading


O V E R L O A D ： M A I N


1. Power supply voltage – Low2. Discharge air pressure – Too high

1. Rectify the power supply voltage.2. Check the suction throttle valve [Fixed speed type]3. Check the capacity control system.


O V E R L O A D ： S U B


1. Power supply voltage – Low2. Cooling fan motor – Failed

1. Rectify the power supply voltage.2. Check the cooling fan motor. (Measure insulation resistance etc.)

Shutdown –Inverter tripping/restarting

＜ F A I L U R E ＞

S Y S T E M R E T R Y ：

1. Power supply voltage – Low or in unbalance2. Discharge air pressure – Too high3. Main motor – OverloadingNOTE: ‘ INVERTER RESTART’ means that the DSP

shutdowns when the inverter repeats a restarting action within 1 minute.

1. Rectify the power supply voltage.2. Check the capacity control system.3. Measure insulation resistance etc. or

check the main motor.

37

4. TROUBLESHOOTING [Troubleshooting the Air Compressor]

4.3 Troubleshooting the Oil Mist Remover

① The vacuum indicator shows a red mark (Gear case has a positive internal pressure)

The pressure gauges reads zero (0) MPa. Check the solenoid valve for operation.

Pressure setting of the regulator is lower ?Reset the regulator to a proper pressure. Clean the fi lter.

Pressure of a control air is lower than 0.39 MPa ? Maintain the pressure of a control air at 0.39 MPa or more.

The gear case or gear case vent pipe has a leak (for example, the oil fi lling port plug on the gear case is not tight).

･ Tighten every screw and plug to remove all leaks. ･ Make sure that the safety relief valve is closed.

Element may be dirty. Inspect the element and replace if necessary.

② The safety relief valve has opened and oil mists are vented (the gear case internal pressure has risen).

See the NOTE below.

Yes

Yes

Yes

Yes

No

No

No

No

The safety relief valve is dirty or stuck open by a foreign object.

Disassemble and clean the safety relief valve. Replace if necessary.

Go to the procedure ① . The vacuum indicator shows a red mark. (Gear case has a positive internal pressure.)

Yes

No

④ Oil pressure is low (oil pump may be inhaling air).

Accumulated oil is visible in the tube between the ele-ment housing and the fl oat trap.

Clean the nozzle of the fl oat trap.

Upper or lower packing is not seated properly on the element ?

Reinstall the element, seating the packing properly for a maximum sealing performance.

Control air contains oil ? Check the control air for oil contents.

Element may be dirty. Inspect the element and replace if necessary.

Yes

Yes

Yes

No

Has the air compressor developed an alarm or shutdown trouble (i.e. oil fi lter dirty, oil pressure reduced due to oil leaking, oil pump failed, safety relief valve failed, etc.)?

Readjust or repair as required.

The nozzle of the fl oat trap is clogged (for example, a large quantity of air is inhaled through the oil recovery pipe to the oil pump inlet)?

Clean the nozzle of the fl oat trap. Disassemble the fl oat trap and clean.

Yes

Yes

No

No

No

38

4. TROUBLESHOOTING [Troubleshooting the Oil Mist Remover]

③ Oil is vented through the ejector’s compressed air outlet (the separated oil is not being recovered).

NOTE:The oil mist remover makes the gear case internal pressure negative during operation, reducing the pressure by 0.005 to 0.01 MPa . This is not unusual; reset the oil pressure on the safety relief valve.

NOTE:The safety relief valve opens immediately when starting the DSP (the control air pressure is still low) or when the DSP has stopped. This is a normal occurrence.

Common Base

Fork Slot Cover

Bolt (M6×15)

Pad

Use a pad to protectthe DSP enclosurepanels.

Use the adhesive tapes to prevent the front door from detached duringconveyance.

Use a pad to protect the DSP enclosurepanels.

Use the adhesive tapes to prevent the front door from detached duringconveyance.

Keep the distance of 1500 mm or more.

Use the strong wires.Adjust the wire length to keep the DSP’s balance when hoisting it.

Lift the unit balanced.

Use the attached tie frame.

5.1 Unpacking the DSP Air Compressor■ After unpacking the crate, verify that the inside DSP is what you have ordered, by referring to page 81 through 82

“STANDARD SPECIFICATIONS” and also by checking the model nameplate.

■ Verify that the DSP is not damaged or deformed in transportation.

Model Nameplate Standard Accessories

Motor Output （kW）

Model

Frequency （Hz）

Foundation Bracket, Foundation Bolt/Nut（M20） 4 pieces

Bolt (M20) for Foundation Bracket 4 pieces

Fork Slot Cover 4 pieces

Bolt (M6) for Fork Slot Cover（M6） 8 pieces

Motorized Isolation Valve（※） 1 piece

Motorized Water Isolation Valve（※※） 1 piece

5.2 Conveying the DSP Air Compressor

■ With a Forklift ■ With a Shop Crane

■ After installing the DSP, plug the fork slots with the fork

slot covers.

Item ※ -marked shall be supplied only for

Item ※※ -marked shall be supplied only for water cooled

Model Total Mass（kg）DSP-100VAN 2,350

DSP-100VWN 2,200

Model Total Mass（kg）DSP-90AL(M)NDSP-100AL(M)N

2,250

DSP-120AMN 2,400

DSP-90WL(M)NDSP-100WL(M)N

2,100

DSP-120WMN 2,250

39

5. INSTALLING AND PIPING THE DSP

5.3 Installing the DSP Air Compressor

■ Install the DSP in a bright, wide, and airy room as follows:

Ventilating Fan

Maintenance Space Ⓓ

Maintenance Space Ⓒ

Foundation

Maintenance Space Ⓑ

Maintenance Space Ⓐ

If you install the DSP in a small room, provide a ventilating fan to keep the room temperature at 45℃ or lower.

Plug the fork slots with the fork slot covers (standard accessory)

Provide a vibration-absorbing mat if the foundation is vibrative. If it is too vibrative, look for another dequate location.

■ Install the DSP in a dry and dust-free room, and avoid the following.

■ Install the DSP on a level floor. ■ Do not install the DSP near a wall. Doing this may cause the operating sound to resonate and increase the sound levels.

Raindrops, Basements, Steam Metals, Sand, Other Hard Materials Harmful Gases

These conditions may cause leakage, condensation, rusting and CPU mal-function.

Installing on a level floor is required to keep an adequate amount of lubrication oil in the DSP and prevent excessive noise and vibration.

Do not set the DSP on the blocks.

These conditions may cause deterio-ration of motor insulation level, dam-age to the air end bearings and CPU malfunction.

These conditions may cause oil deterio-ration, corrosion of coolers and peeling of the rotor coatings.

Prohibited

WARNING

1. Keep flammable solvents or any other hazardous chemicals away from the DSP. Such chemicals may be sucked by the air end, compressed, and exploded.

2. Do not use fire near the DSP; otherwise the sparks may enter the air end and burn it internally.

CAUTION

● Install the DSP indoors. Installing it outdoors may lead to a damage of the air end due to water vapor, dust, etc.

● The DSP installation room must have an air intake opening and an air exhaust opening and must be well ventilated. If the room is poorly ventilated, hot air exhausted by the DSP may cause the room temperature to rise abnormally and in the worst case lead to damage of the air end.

（　　　　　　　　　　　）Chlorine, hydrogen sulfide, sulfurous acid, highly

concentrated ozone, and ammonium gases

※ Keep the spaces in the below table required for cooler-air intake, daily maintenance and overhauling.

Maintenance Space

Item Air-cooled type Water-cooled typeA Front 1000 1200B Right 1200 800C Rear 1000 1000D Left 1000 1000

40

5. INSTALLING AND PIPING THE DSP [Installing the DSP Air Compressor]

5.4 Piping the DSP Air Compressor5.4.1 General Instructions

5.4.2 Two-Unit Parallel Piping / Operation

Stop Valve

Condensate Drain Valve

IMPORTANT

Prevent the condensate from flowing back from the main plant airline pipe.

From the DSP

Main Plant Airline Pipe

500mm or more

Stop ValveMotorized isolation valve(VSD only)

Air Receiver Tank

Stop Valve

Opened

Operating DSP

Non-Operating DSP

Closed

Discharge Air

Motorized isolation valve(VSD only)

If you operate only one of the two or more DSPs, keep fully closed the discharge stop valve of the non-operat-ing DSP.If you operate the two DSPs alternately and automati-cally, use an electric-driven or any other automatic stop valve, one that can be automatically closed when the corresponding DSP has stopped.If you use a solenoid valve as an automatic stop valve, consult your Hitachi distributor.

A motorized isolation valve is included as a standard accessory. Arrange for the motorized isolation valve to be “closed” while the compressor is stopped. If not using the motorized isolation valve, when operating one side, provide a stop valve for the dis-charge piping of the compressor that is not running and close it completely.

IMPORTANT

Assume that one DSP is operating and another is not. In case that the discharge stop valve of the non-operating DSP is opened, a back pressure is applied on that DSP ’s aftercooler, check valve, etc. As a result the condensate is produced much more than otherwise; even the Aftercooler is rusted internally and the check valve is earlier rusted.

① Use the degreased pipe as a plant airline pipe.

② If you connect the DSP directly to a gas pipe, use a

union or flange joint to ease disassembling the DSP

enclosure panels.

③ If a plant airline pipe is longer, use a larger diameter

pipe taking into consideration the pressure loss

through the pipe.

④ If there is a concaved or upright part in a plant airline

pipe, provide a condensate drain valve at its bottom.

41

5. INSTALLING AND PIPING THE DSP [Piping the DSP Air Compressor]

⑤ Install a discharge stop valve on a plant airline pipe

near the DSP.

⑥ If you want to elevate a plant airline pipe near the

DSP, keep a space of 500 mm between the elevated

pipe and the DSP enclosure panel to ease the main-

tenance servicing.

⑦ If you connect the DSP’s discharge pipe to a main

plant airline pipe, run the discharge pipe upwards and

then downwards before joining to the main plant airline

pipe, to prevent the condensate from flowing back.

Discharge Air

Stop Valve

Union or Flange Joint

IMPORTANT

(1) This is to prevent the reciprocating compressor’s air pulsation from affecting the DSP.

(2) Usually, continue to operate the DSP as long as pos-sible and start and stop a reciprocating compressor in parallel as required by the compressed air demand.

① As the DSP employs a 0%- or 100%-capacity, 2-step

capacity control system, install an air receiver tank

on the plan airline pipe. Its capacity is as indicated in

the following table.

5.4.4 Air Receiver Tank

② Do not install a check valve between the DSP and

the air receiver tank. Otherwise, the DSP may hunt,

that is, load and unload very frequently; the capacity

control system may not work normally.

③ However, in case of AUTO operation specification,

quantity control specification and alternate operation

specification, install air chambers of 2.26m3 so as to

maximize the energy saving effect.

④ When selecting energy saving operation, install air

chambers of 2.26m3 so as to maximize the energy

saving effect in all the areas of load factors .

Discharge Air Stop Valve

FlangeAir Receiver Tank

Pressure detecting pipe (VSD only)

Motorized isolation valve

5.4.5 Parallel Piping / Operation with a Reciprocating CompressorCheck ValveStop Valve

Discharge Air

Stop Valve

Connect the DSP’s dischargepipe to the secondary part ofthe air receiver tank.

Model Dis.Pressure (MPa) Minimum Capacity of Air Receiver Tank (m3)

DSP-90AN, DSP-90WN 0.70/0.93 2.26DSP-100AN, DSP-100VANDSP-100WN, DSP-100VWN 0.70/0.93 2.26

DSP-120AN, DSP-120WN 0.70/0.93 2.26

CAUTION

Do not install a check valve between the DSP and the air receiver tank. Otherwise, the DSP may hunt, that is, load and unload very fre-quently ; the capacity control system may not work normally.

If you fail to install an air receiver tank, the DSP may load and unload frequently; its mechanical service life may be shortened.

5.4.3 Motorized Isolation Valve

The V type is equipped with an AUTO operation as a

standard function, and gets its structure from the sec-

ondary side of the motorized isolation valve.

Mount the pressure detecting pipe (customer supplied)

and motorized isolation valve (standard accessory).

Connect the pressure detecting pipe from the position

on the upper pipe, which is as close as possible to the

secondary side of the motorized isolation valve, to the

receiver pressure detecting port of the compressor.

Also, avoid operating the equipment without mounting

the pressure detecting pipe. The safety valve actuates

because pressure is not detected.

Pressure detecting pipeDischarge

Air Stop Valve

Flange

Motorized isolation valve

Air Receiver Tank

IMPORTANT

As shown in the figure above, if the compressor is stopped by the AUTO function, the motorized isolation valve closes. If a motorized isolation valve is not mounted, back pres-sure rises in the after cooler, check valve, etc., when the compressor stops running. These conditions promote drainage, and are contributing factors to rusting inside the after cooler and early rusting of the check valve, etc.

CAUTION

42


Cooling Water Inlet

Cooling Water Outlet

Water Drain Valve

① Leave open the end of any condensate drain pipe.

② Do not merge the DSP’s condensate drain lines (for

the aftercooler, for intercooler, for the control line

filter) into one. Also, do not merge any condensate

drain pipe into an external condensate drain pipe

(for example, one for other DSPs or one for an air

receiver tank). Otherwise, a pressure dif ference

may be generated; as a result, the DSP cannot drain

the condensate or can drain it only abnormally or

you cannot visually check whether the condensate is

regularly drained.

5.4.6 Condensate Drain Pipeing

Drain Pit

Drain Pipe

Oil Mist Remover needs the compressed air control air

of 0.10 to 0.39 MPa as a control air. Prepare the air com-

pressor, and connect the control air pipe to the “A” part

of the Oil Mist Remover.

A

Pressure Gauge

Filter Regulator

IMPORTANT

The control air must be as dry as possible. Connect the control air pipe, therefore, to the downstream of the air dryer or, if the air dryer is not used, to the upper section of the air receiver. This allows you to less frequently drain the condensate from the filter bowl.

5.4.8 Connecting with the Control Air Pipe

CAUTION

Un-drained condensate can backflow to the DSP air compressor and cause a failure.

5.4.7 Cooling water piping

① Piping for supplying water to and draining water

from the cooler is required.

② Mount the water drain valves of the cooling water

outlet and inlet downward facing downward as

shown in the figure. The water drain valves may also

be mounted facing sideways.

③ Use the union joints that enable you to disconnect

and reconnect the cooling water pipes easily.

43


Technical Data for Room Ventilation

Model DSP-90AN

DSP-100AN

DSP-120AN

DSP-100VAN

Heat GenerationMJ/h 387 430 498 440

(kcal/h) (92,500) (102,800) (118,900) (105,000)Air Exhaust m3/min 250 270Approximate TemperatureRise (exhausted air) ℃ 24 26 28 25

Allowable Pressure Loss(exhaust duct) Pa (mmAq) 20(2)

Recommended Ventilating Fan ① m3/min 1,030 1,140 1,320 1,170

Recommended Ventilating Fan ② m3/min 280 280 300 300

① Air Intake Opening Provide the air compressor room with an air intake

opening that:

– is more than 1 m² per one unit of DSP,

– is positioned as low as possible on the wall, and

– is located where is free from external dust and

harmful material.

② Ventilation without Duct (Figure A) For the ventilation without an exhaust duct, install

a ventilating fan with a capacity as specified by

the Recommended Ventilating Fan ① in the

Technical Data for Room Ventilation. The capac-

ity is based on the allowable room temperature rise

of 5℃. Position the ventilating fan as high as possi-

ble on the wall.

③ Ventilation with Duct and without Ventilating Fan (Figure B) For the ventilation with an exhaust duct, calculate

the duct’s pressure loss based on the Air Exhaust (air compressor) in the Technical Data for Room Ventilation.

If the calculated pressure loss is smaller than 20 Pa,

a ventilating fan is not required on the duct. Install

the duct with its detachable end contacting directly

onto the grilled air exhaust (air compressor part

only) of the DSP’s top enclosure panel.

④ Ventilation with Duct and Ventilating Fan (Figure C) If the pressure loss as calculated as above ③ is 20

Pa or larger, a ventilating fan is required on the

duct. Install the duct with keeping a gap of 200 to

300 mm between the duct end and the grilled air

exhaust (air compressor part only) of the DSP’s top

enclosure panel. On the other end of the duct, install

a ventilating fan with a capacity as specified by the

Recommended Ventilating Fan ② in the Technical Data for Room Ventilation. When selecting a

ventilating fan, consider not only this capacity but

also the duct pressure loss and the exhausted air

temperature rise.

Air IntakeOpening

air exhaust(air compressor)

air intake

air exhaust

VentilatingFan

Exhaust Duct

air exhaust

Ventilating Fan(30m3/min or more)

To be detachable.

h

Figure A Figure B Figure C

Air IntakeOpening

Exhaust Duct

Air IntakeOpening

air intake

air intake

VentilatingFan

air exhaust

CAUTION

1. Install the ducts, one each for DSP’s, so that every duct independently exhausts the air.

2. Alternatively, install the main duct and the branch ducts (one each for DSP’s) so that the main duct exhausts the air. Follow the Figure C for ducting work. Select the ventilation fan with the capacity ② (as indicated in the Table) multiplied by the number of DSP’s.

5.5.1 Air-Cooled Type Air-Cooled

5.5 Ventilation of Air Compressor Room

IMPORTANT

1. Stop the ventilating fan when the DSP has stopped.2. Keep the ventilating fan operating while the DSP is

operating. Resistance of the un-operated ventilating fan may reduce the performance of the DSP cooler.

3. Duct is to be detachable so that you can service the DSP easily.

CAUTIONProvide a ventilating system to the air com-pressor room in the event of a room tempera-ture exceeding the allowable ambient operat-ing temperature of 45°C. Operating the DSP under the ambient operating temperature above 45°C may cause a serious problem to the air end.

44

5. INSTALLING AND PIPING THE DSP [Ventilation of Air Compressor Room]

① Ventilation with Ventilating Fan (Figure A)

For a small air compressor room, install a ventilating

fan with a capacity as specified by the Technical

Data for Room Ventilation. Position the ventilating

fan as high as possible on the wall and provide the

air compressor room with an air intake opening on

the bottom of the wall.

Install the DSP to direct its air exhaust louver to

the ventilating fan and its air intake louver to the air

intake opening.

Technical Data for Room Ventilation

Model DSP-90WN DSP-100WNDSP-100VWN DSP-120WN

Heat GenerationMJ/h 44 49 56

(kcal/h) (10,400) (11,600) (13,400)

RecommendedVentilating Fan ① m3/min 120 130 150

The capacity is based on the allowable room temperature rise of 5℃ and the static pressure of 0 Pa.

② Ventilation without Ventilating Fan (Figure B)

For a large air compressor room, install the DSP in

the airy area.

Ventilating Fan

Air IntakeOpening

air exhaust


air intake

Figure A

Figure B

Air IntakeOpening


air exhaustair intake

5.5.2 Water-Cooled Water-Cooled

45

5. INSTALLING AND PIPING THE DSP [Ventilation of Air Compressor Room]

① Fill the oil through the oil filling port until the oil

reaches the upper red line of the oil level gauge. Use

the Hitachi recommended oils ( p. 10).

② Fully close the water drain valve and start to flow

the cooling water.

③ Make sure that the cooling water flow rate is nor-

mal.

④ Connect the power, and verify that the POWER light

is ON.

⑤ Change 2 of 3 wires of the power cord if the display

shows CABLE CONNECTED: REV ersal PHASE.

6.1 Air Compressor

6.1.1 Preparing the Air Compressor

① Fully open the discharge stop valve, and press the

START button.

② Verify that the DSP rotates in a proper direction.

Change 2 of 3 wires of the power cord if the DSP

rotates improperly (or is in a reversal phase connec-

tion).

③ Oil pressure rises to 0.12 MPa or more approx. 10

seconds after starting operation. If oil pressure does

not rise, adjust the oil pressure with the relief valve.

④ In the case of the Fixed speed type, switch to previ-

ous load operation within 15 seconds, and for the V

type, switch in approx. 10 seconds.

⑤ Raise the pressure step by step as illustrated below.

6.1.2 Starting the DSP Air Compressor

③



ＡＬＡＲＭ

警　報

運転状況

故　障

ＬＯＡＤ


ＲＥＭＯＴＥ

負　荷





１２記　憶



ＳＴＲ




②

UNLOAD STOP

②

③④

①



ＡＬＡＲＭ

警　報

運転状況

故　障

ＬＯＡＤ


ＲＥＭＯＴＥ

負　荷





１２記　憶



ＳＴＲ




UNLOAD STOP

[Rear View]



CAUTION

● Before you connect the power, verify that the DSP is correctly installed, piped, and wired.● Check the power supply, and verify that it is firmly grounded and that the voltage is within an allow-

able range (–5% to +10%).

WARNING

Hitachi has NOT filled the oil into the DSP.Before a startup operation fill any Hitachi recommended oils ( p.10).If you operate the DSP without filling the oil, the air end may be failed or burnt.

Water-Cooled

Dis

char

ge P

ress

ure

MPa

0.70

0.60

0.50

0.40

0.30

0.20

0.10

0

Pressure Raising Patternfor the specified dischargepressure 0.70 MPa

Operationg Hours

0.5 1.0 1.5 2.0

Method of Raising the PressureDuring a startup operation, raise the dischargepressure step by step. For 30 minutes afterstarting, operate the DSP at 0.10 MPa with thedischarge stop valve fully opened. Then raisethe pressure (close the discharge stop valve)by 0.69 MPa every 15 minutes until the pressurereaches the specified 0.70 MPa.For the DSP startup operation, observe themethod without fail.

46

6. STARTUP OPERATION Follow the instructions in this chapter, also when you restart the DSP after a long-term suspension.

During inspection of the operation of the safety relief valve, use the appropriate facial protection. High pressure air containing dust particles can cause severe injury.

① Check the LCD for operating pressures and tem-

peratures, and verify that:

　 – Discharge air pressure, interstage air pressure,

oil pressure, discharge air temperature, 2nd-stage

suction air temperature, oil temperature stay with-

in a normal range; see the table below

② Make sure air containing drain from the inter cooler

drain discharge por t and after cooler drain dis-

charge port is intermittently discharged.

6.1.3 During Operating the DSP Air Compressor

① Press the UNLOAD STOP button. The compressor

then unloads for 5 minutes and then stops running.

(In the case of an emergency, press the STOP button.)

② Check the LCD for pressures, and verify that:

- Oil pressure, interstage air pressure, 0 MPa (or 0.01 MPa

depending on your operating conditions).

③ Drain the condensate through the control line filter’s

condensate drain valve. （Fixed speed type）

④ Close the discharge stop valve.（V-type）　 Close the discharge stop valve.（Fixed speed type）

⑤ Drain the cooling water.

Open the water drain valve to drain the cooling

water. Do not fail to drain the cooling water specifi-

cally when in winter season because the remaining

water may be iced inside and as a result the casing

and/or coolers may be burst.

モニタ


遠方

機能

電源

運転停止

運転状況

故障

運転管理

負荷

遠方

起動待ち

設定

自動

UP/　DOWN

警報

記憶


＋／－

AUTO

MONITOR

MENU

SET

SELECT/WIDE

2

RUNNING CONTROL

STARTREMOTE

1

FUNC

［× 10h］

ALARM

STR

REMOTE

RUNNING MODE

AUTO START

POWER

LOAD

RESETSHUTDOWN

STOP

MONITOR

UNLOAD STOP

②

④

③



ＡＬＡＲＭ

警　報

運転状況

故　障

ＬＯＡＤ


ＲＥＭＯＴＥ

負　荷





１２記　憶



ＳＴＲ




UNLOAD STOP①

[Rear View]



WARNING

Water-Cooled

Proper Pressure/Temperature Indications on LCD

LCD IndicationDSP-90AL(M)N, DSP-90WL(M)N

DSP-100AL(M)N, DSP-100WL(M)NDSP-120AMN, DSP-120WMN

DSP-100VANDSP-100VWN

Operating State Working Pressure － Loading Unloading Loading Purging

Discharge Air Pressure 0.70MPaMPa

0.70 or less 0.60 to 0.70 0.72 or less0.93MPa 0.93 or less 0.83 to 0.93 0.75 or less

Interstage Air Pressure MPa 0.17 to 0.27 -0.08 to 0 0.17 to 0.30 0.02 to 0.10

Oil Pressure MPa ＊0.12 to 0.18＊0.08 to 0.18 (Freg. 45Hz or higher)0.04 to 0.16 (Freg. less than 45Hz)

1st-Stage Discharge Air Temperature 0.70MPa ℃ 220/210 or less 225/215 or less0.93MPa 220/210 or less 225/215 or less

2nd-Stage Discharge Air Temperature 0.70MPa ℃ 225/215 or less 225/215 or less0.93MPa 255/245 or less 255/245 or less

Oil Temperature ℃ 68/65 or less 68/65 or less2nd-Stage Suction Air Temperature ℃ 68/65 or less 68/65 or less

＊ The oil pressure may exceed 0.18 MPa temporarily when starting the DSP. this is normal.

6.1.4 Stopping the DSP Air Compressor

47

6 STARTUP OPERATION [Air Compressor]

6.2 Oil Mist Remover

■ Initial Setting of Regulator

① Set a control air pressure to a maximum level.

Example: If a control air pressure varies between

0.55 MPa and 0.65 MPa, maintain it at its

maximum 0.65 MPa.

② Pull up the regulator knob, and then the regulator is

unlocked or settable.

③ Turn the regulator knob so that the pressure gauge

reads as follows:

④ Make sure that the vacuum indicator does not show

a red mark.

⑤ Make sure that there is no leak of the control air

pipe joints.

⑥ Press down the regulator knob to lock.

⑦ The oil mist remover makes the gear case internal

pressure negative during operation reducing the oil

pressure by 0.005 to 0.01 MPa. This is not abnormal.

Reset the oil pressure on the relief valve.

⑧ Stop the DSP. Make sure that the solenoid valve is

de-energized to close, the pressure gauge reads 0

(zero), and accordingly the vacuum indicator shows

a red mark.

Standard Setting of Regulator

MPa

Air Flow Rate

(liter/min)

0.35 about 60

NOTE:The pressure gauge readings may increase/decrease by 0.03 MPa as the control air pressure decreases/increases respectively by 0.10 MPa. Remember that, due to the regula-tor’s characteristics, the former rather rises if the latter drops.

CAUTION

1. The oil mist remover can operate when the control air pressure is to 0.39MPa or more. If the control air of this pressure is not available (that is, when the DSP is just started or is unloading with opening the blowoff valve), the ejector can not operate and, as a result, the gear case internal pressure rises. When the gear case internal pressure reaches about 20mmH2O, the relief valve opens to relieve it to the atmosphere for preventing its abnormal rise, and thereby oil mists are inevitably vented. Avoid, therefore, a long time unloading operation as possible as you can; and, if it is unavoidable, take a precaution so that the DSP dos not suck the oil mists.

2. If you use two or more DSPs in parallel, the system forces a specific unit to unload for a long time. Its oil mist remover ejector seldom operates and thereby its relief valve opens frequently with much oil mists vented. To solve the problem, connect its control air pipe to where is always pressurized thereby minimizing the period to open the relief valve.

3. The relief valve shortly opens when you start/stop the DSP even if the control air pressure is high. After the repeated starting/stopping, the relief valve may be slightly oozed with oil. This is not abnormal.

4. The oil mist remover consumes the compressed air of 60 liters per minute or lower or higher. Exact air consumption depends on the setting of the regulator.

5. Take a precaution if you use the DSP in an AUTO operation mode with the oil mist remover, because the DSP may not stop automatically due to an uninterrupted consumption of the compressed air by the oil mist remover.

48

6. STARTUP OPERATION [Oil Mist Remover]

Switch off the earth leakage circuit breaker at the closing time of a working day.

To the DSP motorT1R1 S1

Earth LeakageCircuit Breaker

■ Example of Power Cable ConnectionEarth leakage circuit breaker is used also as a disconnecr.

7.1 Power Supply Transformer and Power Cable

Prepare a power supply transformer with adequate

capacity. Also, use a power cable with adequate thick-

ness and length. Otherwise, an excessive voltage drop

may occur when you have pressed the START button;

accordingly the DSP motor may fail to fully accelerate.

7.2 Connecting a Power Cable① Hitachi completes wiring inside the DSP.

Refer to “Wiring Connection Diagram” on pages 52

- 56.

② What you must do is to connect a power cable and

a grounding cable. Meet the ground resistance

requirements as follows:

　

Power Supply Voltage Ground Resistance Type Ground Resistance Value200V Class Type D 100Ω or less400V Class Type C 10Ω or less

③ Connect the power cable so that it allows you to easi-

ly disassemble and reassemble the enclosure panels.

④ Install an earth leakage circuit breaker between the

DSP and the power supply for protecting the motor.

⑤ Use the HITACHI earth leakage circuit breaker.

⑥ In the event that you use a non-HITACHI earth leak-

age circuit breaker, consult your distributor because

a selection condition may be dif ferent between

Hitachi and other manufacturers.

ModelDSP-90ALMDSP-90WLMDSP-100ALMDSP-100WLM

DSP-90AMNDSP-90WMN

DSP-100AMNDSP-100WMN



Power Supply Voltage 200V Class 400V Class 400V Class 400V Class 400V ClassPower Transformer Capacity (1) (KVA) 200 or more 200 or more 200 or more 250 or more 200 or more

Power Cable Thickness (mm2) 200(2) to 325 100(2) to 150 125(2) to 150 125(2) to 150 125(2) to 150

NOTES:(1) Capacity values are reference data; some power supplies may require a larger-capacity transformer.(2) Lower thickness values are based on the power cable length of less than 10 m. In the event that the power cable is longer than 10m,

employ a thicker one. Provide intermediate terminals to keep the thickness lower than the maximum values at the air compressor terminal block.

■ Usable HITACHI Earth Leakage Circuit Breakers

ModelDSP-90ALMDSP-90WLMDSP-100ALMDSP-100WLM

DSP-90AMNDSP-90WMNDSP-100AMNDSP-100WMN



Power Supply Voltage 200V Class 400V Class 400V Class 400V ClassMotor Starting Method Star-Delta Starting InverterModel of Hitachi

BreakersEX600BK

(500A)EX400B(225A)

EX400BK(400A)

RX400B(350A)

NOTE: Use the earth leakage circuit breaker that is sensitivity-current-switchable (selectable, either 100 mA or 200 mA), and set its earth leakage sensitivity current to 200 mA.

1. Always use a licensed electrician. Do not allow an unlicensed person to wire the air compressor. An unlicensed person may wire the air compressor wrongly, and a wrong wiring may cause an electric shock.

2. Do not remove any protective relays on the air compressor. Also, do not make a modification of the control circuit that may result in impairing the protective relay's function. Remember that the loss of the protective relay's function may cause serious damage to the air compressor such as a burning of the air end. In the event that you need to modify the control circuit, consult your distributor.

3. Before opening the starter/control box cover to service or wire the air compressor, disconnect the power; otherwise you may receivean electric shock. In addition, attach a notice on the power supply stating “Under the maintenance work. Keep the switch off.” to prevent someone from carelessly turning the switch on.

Also a control circuit may occur be energized insuffi-

ciently ; accordingly the DSP may be shut down.

Always control the maximum drop of starting voltage with-

in 5% of the rated voltage. To do so, use the power supply

transformer and power cable as listed in the table below.

49

7. WIRING

WARNING

⑦ Before overhauling the DSP, adding the oil and cool-

ant to the DSP, or servicing the starter/control box,

disconnect the power and verify that you are safe.

Immediately after disconnecting the power, the inverter is still live. Before servicing the starter/control box, therefore, make sure that the inverter’s charge indicator is off or wait for 10 minutes after disconnecting the power.

CAUTION

● Install an earth leakage circuit breaker between the air compressor and the power supply. Do not use a mere disconnector such as a knife switch in wiring because it cannot protect the air compressor and may result in a burning of the air end if a ground fault has occurred.

● Ground the air compressor; otherwise you may receive an electric shock, or the air compressor may fail. As a ground, do not use a steel skeleton of the building because it may cause an operational fail-ure. Ground independently and directly into the earth.

CAUTION

Remove the starter/control box covers and connect a

power cable as illustrated below.

■ Other Operating Precautions（1） A thermal relay is not provided on the main circuit

of the inverter-controlled DSP. Instead, the elec-

tronics-type thermal relay is built into the inverter

for protecting the main circuit.

（2） Phase failure is only enabled immediately after con-

necting the power. If a phase failure occurs during

operation, it is not detected and eventually causes

the inverter to overheat. Tightly fasten, therefore,

the cables/wires.

（3） Do not install a power-factor enhancing capacitor

on the motor side. Failure to observe this may

cause the inverter’s capacitors to receive the larger

charging current, resulting in a failure of the

inverter.

（4） If radios, TV sets, or any other electronics devices

are located around the DSP, install the HITACHI

noise filters (as specified below) on the power

cable.

（5） The inverter in the starter is attached with a digital

operator for setting and operating the inverter.

Hitachi has finished adjusting the digital opera-

Unprotected power cable can directly touch the steel plates on the power cable holes due to a slight operating vibration, and its cove may be damaged in a long time; as a result, a short circuit accident may occur.

Description 100VAMN100VWMN Functions

Zero phase reactor 400V class ZCL-A Reduction of noise

to radio etc.

Radio noise filter for input 400V class CFI-H Reduct ion of rad ia t ion

noise from the power cable

Noise filter for inverter 400V class NF-H250 Reduction of normal noise and

common noise from the power cable

50

7. WIRING [Connecting a Power cable]

CAUTION

tor to the appropriate settings, before shipping

the DSP from the factory. Do not operate the attached digital operator; otherwise the inverter

may malfunction and cause a problem.

7.3 Wiring Connection Diagram

1．Wiring Connection Diagram（DSP-90/100/120N、400/440V） ……………… Page 52

2．Wiring Connection Diagram（DSP-90/100/120AMN、400/440V） ……………

3．Wiring Connection Diagram（DSP-90/100/120WMN、400/440V） ………… Page 54

4．Wiring Connection Diagram（DSP-100VAMN、400/440V）…………………… Page 55

5．Wiring Connection Diagram（DSP-100VWMN、400/440V） ………………… Page 56

7.4 Control Panel /LCD monitor Specifications

Operating Source Voltage

200 V (50 Hz, 60 Hz) / 220 V (60 Hz)

Starting Method Fixed Speed … - △ (3 contactors) VSD … Variable Frequency Drive

Operating Functions

（1）Unload stop operation （2）IPI restart (optional) （3）Remote operation （4）Dryer prestart （5）Dual operation (optional) （6）Schedule operation （7）Energy save operation

Display Functions (Light)

（1）POWER light （2）START light （3）SHUTDOWN MODE light（4）LOAD light （5）REMOTE light （6）AUTO light（7）AUTO START light

Setting function Display function(4 digit digital monitor)

（1）Control setting and function setting

（1）Discharge pressure （2）Running hours （3）Discharge temperature （4）Load ratio （5）Warning/Shutdown Code （6）Warning/Shutdown History（7）Pressure setting

Display Functions (LCD display)

（1）Monitor Display‒ Clock ‒ Control Setting ‒ Discharge pressure ‒ Interstage Pressure ‒ Oil pressure ‒ Operating hours ‒ Loading hours ‒ Number of load/unload ‒ Dis. Temp. 1 ‒ Dis. Temp. 2 ‒ Oil Temp. ‒ Current ‒ 2nd stage Air End Suction temp. ‒ Hours before next maintenance ‒ Next maintenance ‒ Load ratio ‒ ON time ‒ OFF time

（2）Message Display‒ Inspection ‒ Auto Stop ‒ Restart‒ Message ‒ IPI/retry ‒ Unload stop running

（3）Alarm/Shutdown Display‒ Alarm ‒ Setting/Connection Error ‒ Reconnect Power‒ Shutdown ‒ Malfunction

（4）Function Setting Display‒ Model setting ‒ Warning history ‒ Scheduled operation‒ Shutdown history ‒ Operating mode ‒ Detailes of shutdown history ‒ Operation data ‒ Capacity control

No Voltage Terminal

（1）Operation output … make contact×1

（2）Alarm output … make contact×1

（3）Shutdown output … make contact×1

IPI Auto Restart Circuit(optional)

13ms or less13ms to Setting (1)Setting (1) or more

Continues operation.Shutdown compressor (dis. air), restart automatically after Setting (2).Shutdown compressor.

(Note) Setting(1) : Selected on the instrument panel (from 1 to 5 seconds) Setting(2) : Selected on the instrument panel (from 15 to 60 seconds) Unload Stop : Operated by unload stop key pad located lower on operation print board.

51

7. WIRING [Wiring Connection Diagram, Starter/Control Box Specifications]

7.3.1 Wiring Connection diagram（DSP-90/100/120N, 400/440V）Air-Cooled

52

7. WIRING [Wiring Connection Diagram]

Air-Cooled

7.3.2 Wiring Connection diagram（DSP-90/100/120AMN, 400/440V）

53


Water-Cooled

7.3.3 Wiring Connection Diagram（DSP-90/100/120WMN, 400/440V）

54


7.3.4 Wiring Connection Diagram（DSP-100VAMN, 400/440V）

55


7.3.5 Wiring Connection Diagram（DSP-100VWMN, 400/440V）Water-Cooled

56


⑴ Air EndA pair of screw rotors rotates while the timing gear

keeps a very small gap between them. This non-con-

tacting, high-speed rotation of the rotors compresses

the intake air. Because oil is not injected onto the

rotors during the compression, an oil-free air is dis-

charged.

The air end consists of the following parts:

⑴ Rotor s: The sur faces of both the male and

female rotors are finished with a special

heat-resistant coating for maintaining the

minimum gap between the rotors.

⑵ Beari ngs: The larger-load male rotor is sup-

ported by the bearings that are larger in

diameter, that is, longer in service life.

⑶ Case: A cooling water jacket is provided on the

case to absorb the compressing heat.

⑷ Timin g Gears:A pair of the precision-finished

timing gears is mounted on the ends of the

screw rotor shafts. It keeps a very small

gap between the rotors and allows them a

non-contacting rotation.

⑸ Shaft Seal: The sealing mechanism consists of

the air seals and the visco-type seals. The

air seals prevent the compressed air from

leaking from the compression chamber

while the visco-type seals the oil that lubri-

cates the gears and bearings from entering

the compression chamber.

⑵ Compressor Drive TrainThe DSP employs a high ef ficient, 2-pole, totally

enclosed, fan-cooled motor for the model. The motor

speed is increased to a rated level, each of the first

and second-stage air ends, by the stepup gears in the

gear case.

⑶ Capacity Control System[Fixed Speed type]When a demand of compressed air decreases, the

system closes the suction throttle valve and at the

same time blows off the internal compressed air to

the outside; thus the DSP unloads. For more infor-

mation, see page 64.

When demand of the compressed air decreases, the

system reduces the motor speed and purges the

compressed air to atmosphere simultaneously.

⑷ IntercoolerAir-Cooled

The air-cooled intercooler is made of aluminum.

The intake air is compressed up to 0.20MPa (and

consequently heated) by the 1st stage air end. The

intercooler cools the heated air to an atmospheric

temperature +15℃, and thereby separates the water

vapor from the discharge air, before it flows into the

2nd stage air end.

Water-Cooled

The DSP employs a shell-and-tube type of water-

cooled intercooler. The intercooler cools the hot,

compressed air of about 0.19MPa that is discharged

from the first-stage air end. After reducing the

compressed air temperature down to less than the

cooling water temperature + 15 to 20℃, the inter-

cooler separates the condensed water from the com-

pressed air. The cooled, compressed air flows into

the aftercooler.

⑸ AftercoolerAir-Cooled

The air-cooled aftercooler is of corrugated fin struc-

ture with aluminum slit fin. It is located downstream

the check valve. It reduces the discharge air tem-

perature down to an atmospheric temperature +15℃ and thereby separates the water vapor from the dis-

charged air.

Water-Cooled

The DSP employs a shell-and-tube type of water-

cooled Aftercooler. Located after the check valve,

the Aftercooler cools the hot, compressed air that

is discharged from the second-stage air end. After

reducing the compressed air temperature down to

less than the cooling water temperature + 13℃, the

Aftercooler separates the condensed water from the

compressed air.

⑹ Check ValveLocated downstream the second-stage air end, the

check valve prevents the discharge air from flowing

back.

⑺ Lubricating SubsystemLubricating subsystem consists of the oil pump, oil

strainer, oil filter, oil cooler, and oil temperature con-

trol valve. The oil pump circulates the oil in the gear

case oil sump through the lubricating subsystem

and thereby lubricates the bearings, gears, etc.

8.1 Standard Components

57

8. STANDARD COMPONENTS AND SUBSYSTEMS

Intake air is compressed and heated by the 1st stage air

end; its pressure is built up to approximately 0.20MPa.

The heated air is cooled down to an atmospheric tem-

perature + 15℃（the cooling water temperature + 15

～20℃）The air is further compressed and heated by

the 2nd stage air end; its pressure is built up to a rated

level.

The reheated air flows through the check valve to the

aftercooler. The compressed air is cooled down to an

atmospheric temperature + 15℃（less than/equal to

the cooling water temperature + 13℃）by the aftercool-

er and discharged to a plant airline pipe.

Conditions in the ( ) are for Water-Cooled models.

Air for cooling is sucked through the panels of enclo-

sure. The cooling fan removes the heat from the air-

cooled oil cooler, intercooler, aftercooler, coolant

cooler, and precooler. Heat-exchanged air is exhausted

through the top panel of the enclosure.

8.2 Air/Oil Flow

Compressor Air Flow

Oil Flow

Cooling Air Flow

Cooling Water Flow

Oil sump is located in the bottom of the gear case. Oil

flows through the oil strainer with a 120-mesh filter

screen to the oil pump driven by a dedicated motor.

Oil is pressurized by the oil pump and is pneumatically

conveyed to the oil cooler. After being cooled, oil flows

through the oil filter with a higher-mesh filter screen

and is injected to the 1st stage air end, the 2nd stage

air end, and the accelerator, is bearings and gears to

lubricate. Finally oil returns to the oil sump; oil thus cir-

culates through the system.

Cooling water remove heat from the intercooler, the

aftercooler, the oil cooler and the casing of air ends

Refer to “Cooling Water Flow Diagram” about each

route of cooling water flow in the package ( page

61, 62).

⑻ Air Intake FilterThe DSP employs a dry-type air intake filter that is

easily cleaned and replaced.

⑼ Cooling Fan Air-Cooled

The low-noise cooling fan cools the cooler, exhausts

the air within the enclosure panels, and exhausts

the compressed air that is blown off when the DSP

is unloading.

⑽ Cooling Fan Water-Cooled

The small cooling fan cools the inside of the pack-

age, and exhausts the internal compressed air that

is released to atmosphere during the unloading

process.

⑾ StarterEither starter employs a printed circuit board on

which a microprocessor is mounted, and thereby

you can easily choose an operation mode and con-

trol function. Both the models come standard with

the terminals for a remote operation.

⑿ EnclosureThe enclosure panels are attached with the sound

absorbing materials. The front enclosure panel

includes a door that eases your maintenance serv-

ices.

Water-Cooled

Air-Cooled

58

8. STANDARD COMPONENTS AND SUBSYSTEMS [Standard Components, Air/Oil/Coolant Flow]

Flow Diagram (Fixed speed type)　Air-Cooled

36

54

1

2

9

TH2

TH5

PS1

TH4

PS4

6

31

32

37

PS2

12

10

11

40

35

52 5153

39 22

TH3

38

3

4

23

21

24

5

34

33

7

63SV

14

14

13

13

8

41

Suction

Discharge

Air Intake for coolers

Air Intake for Motor

Control air

Exhaust Exhaust


Compressor Air Flow1 First-Stage Air-End2 Second-Stage Air-end3 Gear Case4 Stepup Gear5 Motor6 Intercooler7 Check Valve8 High-Precooler9 Aftercooler

10 Safety Valve11 Compressed Air Discharge12 Check Valve13 Drain Solenoid (W/strainer)14 Orifice

Capacity Control & Blowoff Air Flow21 Air Intake Filter22 Suction Throttle Valve23 Blowoff Valve24 Blowoff Silencer

Oil Flow31 Oil Strainer32 Oil Pump33 Relief Valve34 Oil Filter35 Oil Cooler36 Oil Temperature Control Valve37 Oil Mist Venting Pipe38 Oil Drain Valve（1）39 Oil Drain Valve（2）40 Oil Drain Valve（3）41 Oil Mist Remover

Cooling Air Flow and Enclosure51 Cooling Fan（1）52 Cooling Fan（2）53 Enclosure54 Air Intake Duct

Sensors and SwitchesPS2 Pressure Sensor (discharge air pressure)PS4 Pressure Sensor (oil pressure)PS1 Pressure Sensor (interstage pressure)TH2 Temperature Sensor (2nd-stage in)TH4 Temperature Sensor (1st-stage out)TH3 Temperature Sensor (2nd-stage out)TH5 Temperature Sensor (oil)

63SV Pressure Differential Sensor (For suction Filter clogging detection)

59

8. STANDARD COMPONENTS AND SUBSYSTEMS [Air/Oil/Coolant Flow]

Flow Diagram　　Air-Cooled

36

54

1

2

9

TH2

TH5

PS1

TH4

PS4

6

31

32

37

PS2

12

10

11

40

35

52 5153

39

TH3

38

3

4

21

5

34

33

7

63SV

14

14

13

13

8

4124

15

24

2223

2223

MDischarge




Suction

Control air

Exhaust Exhaust

Compressor Air Flow1 First-Stage Air-End2 Second-Stage Air-end3 Gear Case4 Stepup Gear5 Motor6 Intercooler7 Check Valve8 High-Precooler9 Aftercooler

10 Safety Valve11 Compressed Air Discharge12 Check Valve13 Drain Solenoid (W/strainer)14 Orifice15 Motorized Isolation Valve


Oil Flow31 Oil Strainer32 Oil Pump33 Relief Valve34 Oil Filter35 Oil Cooler36 Oil Temperature Control Valve37 Oil Mist Venting Pipe38 Oil Drain Valve（1）39 Oil Drain Valve（2）40 Oil Drain Valve（3）41 Oil Mist Remover

Cooling Air Flow and Enclosure51 Cooling Fan（1）52 Cooling Fan（2）53 Enclosure54 Air Intake Duct

Sensors and SwitchesPS2 Pressure Sensor (discharge air pressure)PS4 Pressure Sensor (oil pressure)PS1 Pressure Sensor (interstage pressure)TH2 Temperature Sensor (2nd-stage in)TH4 Temperature Sensor (1st-stage out)TH3 Temperature Sensor (2nd-stage out)TH5 Temperature Sensor (oil)


60


Flow Diagram (Fixed speed type)　Water-Cooled

3953

33

1

38

2

3

5234

6

11

13

22 21

5

3723

824

7

51

31

4

10 9

35

PS2

TH4

PS463SV

TH2

PS5

TH5

32

36

12

13

12Suction

Control air

Air intake for motor

Discharge

Exhaust

Legend Compressor Air Flow

1 First-Stage Air-End2 Second-Stage Air-End3 Gear Case4 Stepup Gear5 Motor6 Intercooler7 Check Valve8 Aftercooler9 Safety Valve

10 Compressed Air Discharge11 Check Valve12 Drain Solenoid (W/strainer)13 Orifice

Compressed Air Flow and Oil Flow

Aftercooler

1st-Stage Air-End

2nd-Stage Air-End

Intercooler

Cooling Water In

Drain Valve

Cooling Water Out

Discharge

Suction

Cooling Water Flow


Oil Flow31 Oil Strainer32 Oil Pump33 Relief Valve34 Oil Cooler35 Oil Filter36 Oil Temperature Control Valve37 Gear Case Vent Pipe38 Oil Drain Valve39 Oil Mist Remover

Cooling Air Flow and Enclosure51 Ventilating Fan52 Enclosure53 Air Intake Duct

61


Legend of Sensors and SwitchesSymbol DescriptionPS2 Pressure Sensor (discharge air pressure)PS4 Pressure Sensor (oil pressure)PS1 Pressure Sensor (interstage pressure)TH2 Temperature Sensor (2nd-stage in)TH4 Temperature Sensor (1st-stage out)TH3 Temperature Sensor (2nd-stage out)TH5 Temperature Sensor (oil)


Flow Diagram 　Water-Cooled

1

38

2

3

5234

6

11

13

21

5

37

87

51

31

4

1014

9

35

PS2

TH4

PS4

63SV

TH2

PS5

TH5

32

36

2424

12

13

12

23 22

2322

33

53 39

M

Control air

Suction


Discharge

Exhaust

Legend Compressor Air Flow

1 First-Stage Air-End2 Second-Stage Air-End3 Gear Case4 Stepup Gear5 Motor6 Intercooler7 Check Valve8 Aftercooler9 Safety Valve

10 Compressed Air Discharge11 Check Valve12 Drain Solenoid (W/strainer)13 Orifice14 Motorized Water Isolation Valve

Legend of Sensors and SwitchesSymbol DescriptionPS2 Pressure Sensor (discharge air pressure)PS4 Pressure Sensor (oil pressure)PS1 Pressure Sensor (interstage pressure)TH2 Temperature Sensor (2nd-stage in)TH4 Temperature Sensor (1st-stage out)TH3 Temperature Sensor (2nd-stage out)TH5 Temperature Sensor (oil)


Compressed Air Flow and Oil Flow

Aftercooler

1st-Stage Air-End

2nd-Stage Air-End

Intercooler

Cooling Water In

Drain Valve

Cooling Water Out

Discharge

Suction

Motorized Water Isolation Valve

M

Cooling Water Flow

Oil Flow31 Oil Strainer32 Oil Pump33 Relief Valve34 Oil Cooler35 Oil Filter36 Oil Temperature Control Valve37 Gear Case Vent Pipe38 Oil Drain Valve39 Oil Mist Remover

Cooling Air Flow and Enclosure51 Ventilating Fan52 Enclosure53 Air Intake Duct

62



Water Relief Pet Cock

Water Drain Valve

8.3 Cooling Water Water-Cooled

1. Cooling Water QualityIf a cooling tower (open-type circulatory cooling water system) supplies the cooling water to the DSP, prob-lems such as corrosion, scale, and slime may be caused by: (1) higher mineral content due to concentration, (2) contamination by foreign matter like insects, and/or (3) production of algae or bacterium. Use the cooling water of as good a quality as possible.

① When stopping the DSP, also stop the cooling water flow. Open the petcock and the water drain valve to drain the cooling water. Failure to do so may cause the cooling water pipe to be iced and burst in win-ter season. Failure to do so may also cause the air end case to be overcooled and dewed with the con-densate internally; the cooling water jackets to be attached with the scale.

② Clean the cooling water subsystem (cooling water jackets of the first- and second- stage air-ends, inter-cooler, Aftercooler, and oil cooler) periodically.

2. Control of Cooling WaterThe service life of the cooling water system depends on water quality. If the cooling water quality is not good, the cooler pipes can be corroded, or scale can be gen-erated. To avoid the problem, periodically sample the cooling water used and subject it to quality inspection.

3. Quantity and Pressure of Cooling WaterThe table below lists desirable cooling water quality that is applicable to the open type circulatory system.

■ Quantity and Pressure of Cooling Water

Model DSP-90WN DSP-100WNDSP-100VWN DSP-120WN

Maximum Inlet Temperature ℃ 35Total Flow Rate ℓ/min 160 160 180Minimum Pressure Differential (between inlet and outlet) MPa 0.15

Temperature Differential (between inlet and outlet) ℃ 9

Minimum Pressure MPa 0.49

Performance of Aftercooler and oil cooler var-ies depending on the extent of throttling the stop valve at the extent of throttling the stop valve at the cooling water inlet and outlet.For controlling the cooling water flow rate, use the stop valve at the outlet leaving the stop valve at the inlet fully opened.

63

8. STANDARD COMPONENTS AND SUBSYSTEMS [Cooling Water]

CAUTION

■ Cooling Water QualityNo Item Make-up Water System Water Used Problem

Corrosion Scale123456789

101112131415

pH [at 25℃]Electrical Conductance [at 25℃] (ms/m)Chloride Ion Clー (mgClー/ liter)Sulfuric Acid Ion SO

42ー (mgSO

42ー /ℓ)

Acid Consumption [at pH 4.8] (mgCaCO3 /ℓ)

Total Hardness (mgCaCO3 /ℓ)

Calcium Hardness (mgCaCO3 /ℓ)

Ferrous Substance (mgFe/ℓ)Sulphur Ion S2ー (mgS2ー /ℓ)Ammonium Ion NH

4 (mgNH

4+ /ℓ)

Ionizing Silica SiO2 (mgSiO

2 / liter)

Isolated Carbonic Acid CO2 (mgCO

2 /ℓ)

Nitric Acid Ion NO3ー (mgNO

3 ー /ℓ)

Organic Substance (KMnO4 Consumption) (mg/ℓ)

Turbidity (mg/ℓ)

6.0 to 8.0less than 30less than 50less than 50less than 50less than 50less than 50less than 0.3Not detectedless than 0.1less than 30less than 4

less than 0.5less than 10less than 10

6.5 to 8.0less than 80

less than 200less than 200less than 100less than 200less than 150less than 1.0Not detectedless than 1.0less than 50less than 4

less than 0.5less than 10less than 10

○○○○－－－○○○－○○○○

○○－－○○○○－－○－－○○

Notes: 1. System Water is the one that passes through a heat exchanger of circulatory or non-circulatory system.Make-up Water is the one that is supplied to a cooling tower.

　　　 2. Above No. 1, 2, 4, 5, 7～ 12 are based on the standard: JRA-GL-02-1994.JRA:（Japan Refrigeration and Air Conditioning Industry Association）　　　 3. The above criteria does NOT give any assurance of trouble-free or problem-free conditions due to other and time-depending factors but the minimum

requirement.

8.4 Capacity Control System

The unloading process occurs when the compressed air demand decreases and the discharge pressure rises as high as cut-out pressure. The pressure sensor (PS) detects the high pressure and energizes the 3-way solenoid valve (20Ux), changing its port to port connec-tion. The control air is now flowing to and pressurizing chamber (A) of the suction throttle valve (STV), con-sequently closing the suction throttle valve (STV) and

unloading the airend while the blowoff valve opens and exhausts the internal compressed air to atmosphere.The loading process occurs when the compressed air demand increases and the discharge pressure dropped as low as cut-in pressure. The pressure sensor (PS) detects the low pressure and 3-way solenoid valve (20Ux), suction throttle valve (STV), and blowoff valve work in reverse action and the airend reloads.

STARTING UNLOADING RELOADING STOPPING

Suction throttle valve (STV) closed

START button ON

Airend starts rotation to compress minor amounts of air

Starts in no load

Changes to full voltage delta connection

3-way solenoid valve (20Ux) switched over to connect

Chamber (A) & Chamber (C)

Suction throttle valve (STV) opens

Loading

Air demand decreases

Discharge pipe pressure rises

Pressure sensor (PS) operates

3-way solenoid valve (20Ux) switched over to pressurize

Chamber (A)

Suction throttle valve (STV) closes

Blowoff valve opens

Internal air in discharge pipe is exhausted to atmosphere

Air demand increases

Discharge pipe pressure drops



Chamber (B)


Blowoff valve closes

Loading


Chamber (A)

STOP button ON


Blowoff valve opens

Internal air in discharge pipe is exhausted to atmosphere

Compressor stops

Vacuum Valve

For 20 seconds after starting with a star-delta starter.

Suction Throttle Valve

1st-StageAir End

Intercooler

Check Valve Aftercooler

Chamber(C)

Chamber (B)

To Chamber (B)

To the Atmosphere

Blowoff Valve

3-Way Solenoid Valve (3)

NC-COM connected for 5 seconds after reactor is changed over to a fullvoltage connection.


Pressure Sensor

Control Line Filter



NCNO

COM

NCNO

COMNC

NOCOM

20U320U2

20U1

PS

Control Air Flow

Starting/Stopping

Loading

Unloading

To Chamber (A)

Chamber (A)

2nd-StageAir End

Check Valve

NONC

COM

3-Way Solenoid Valve (20US)


20U4

NC

NO

COM

20US

8.4.1 Standard Load-Unload Operation

64

8. STANDARD COMPONENTS AND SUBSYSTEMS [Capacity Control System]

AUTO operation is Auto start - stop function in addition

to a standard on-off line, 0% or 100% capacity 2-step con-

trol. The CPU on the PC board is continually calculat-

ing a load ratio.

STARTING UNLOADING RELOADING STOPPING

Suction throttle valve (STV) closed

START button ON

Airend starts rotation to compress minor amounts of air

Starts in no load

Changes to full voltage delta connection

3-way solenoid valve (20Ux) switched over to connect

Chamber (A) & Chamber (C)


Loading

Air demand decreases

Discharge pipe pressure rises



Chamber (A)


Blowoffvalve opens

Internal air in discharge pipe is exhausted to

atmosphere

Air demand increases

Discharge pipe pressure drops



Chamber (B)


Blowoff valve closes

Loading


Chamber (A)

STOP button ON


Blowoff valve opens

Internal air in discharge pipe is exhausted to

atmosphere

Compressor stops

Load-Unload Operation

AUTO Operation

How long has motor been running ?

Load rate

Has motor stopped and restarted 3 times or more for

90 (150) minutes

Motor stops automatically

Less than

specified

What is the plant compressed air piping

pressure ? 10 seconds or more

How long has motor been stopped ?

Less than 10 seconds

More than specified

10 minutes or more

Less than 30%

30% or more

Less than 10 minutes

YES

NO

I f 70 m inu tes o r more has passed after the third stop, the motor will continue to operate for a minimum of 20 minutes after restart of the air compressor, and then return to the initial 90 (150) minute cycle.

STV: Suction Throttle Valve 20Ux: 3-Way Solenoid Valve

8.4.2 Optional AUTO Operation

65


When the load ratio is less than 30%. CPU stop the main

motor. And automatically restart when the line pres-

sure is dropped to cut-in pressure.

8.4.3 Typical Change of Pressure⑴ Standard Offline-or-Online, 0%-or-100%-Capacity, 2-Step Control

Starting and Pressure Raising

Loading Unloading Loading

Air Receiver Pressure

Air End Outlet Pressure

Pre

ssur

e

0.70

0.60

0.10

MPa

Time

⑵ Optional AUTO Operation

（1） Stop Delay (10 minutes)

（2） Stop Delay (30% load)

（3） Start Delay (10 seconds)

Starting and

Pressure Raising

LoadingRepeated Loading/Unloading

Automatic Motor Stop



Pre

ssur

e

0.70

0.60

0.10

MPa

Time

Automatic Motor Restart

Indications on LCD

⑴ Stop Delay Time – 10 minutes are required to keep the motor operating long enough to cool down sufficiently.

If the third stop extends over 70 minutes, how-ever, the motor must keep operating for more than 20 minutes after restarting.

⑵ Stop Delay Time – The DSP is con-tinually calculating a load ratio. If the load ratio is 30% and the motor has stopped/restarted maximum 3 times for the past 90 minutes, then the motor stops.

⑶ Stop Delay Time – 10 seconds are required to complete blowing off the compressed air and to be prepared to restart.

( 　 )

Startingand

PressureRaising

Loading Unloading

Power Save Operation

load/unload cycling interval（standard 30 seconds）

Loading Unloading



Pre

ssur

e

0.70

0.60

0.10

MPa

Time

＊ 0.62（minimum）

Loading UnloadingLoading Unloading

⑶ SAVE Mode Operation

NOTE:This is an example of power save opera-tion, based on the target pressure of：0.62MPa and the load/unload cycling interval of 30 seconds. The target pres-sure with an asterisk may vary depend-ing on the air receiver’s capacity and the air consumption.

66


Air Intake

Air Intake Filter

1st-Stage Air End

Intercooler

Check Valve

Aftercooler

Blowoff Silencer

Pressure Sensor

Air Discharge

1st-Stage Blowoff Solenoid Valve (1)

2nd-Stage Blowoff Solenoid Valve (1)

2nd-Stage Blowoff Solenoid Valve (2)

1st-Stage Blowoff Solenoid Valve (2)

2nd-Stage Air End

PS2

8.4.4 Capacity Control System V-type

Flow of Purging Air and Action of Blowoff Solenoid Valve

Operation Phase of DSPAction of Blowoff Solenoid Valve（1）（2）

Starting Opened fully Closed fullyLoading Closed fully Closed fullyPurging Opened fully Closed fullyStopping Opened fully Closed fullyPower Interruption Closed fully Opened fully

8.4.5 Relation between Air Consumption Rate and Capacity Control System

IMPORTANT

For changing the pressure settings, see page 24.For changing the SW3 settings, see pages 24 and 27.

※ Figure in〔〕are for 0.93MPa models.

AirConsumption

(%)

OperatingFrequency

(Hz)Capacity Control System

Pressure Settings (MPa) SW3SettingsSetting Items Factory Lower

Example

100 to 4560 to 33

〔60 to 40〕①CPCS Motor Speed Control

Standard0.70

〔0.93〕0.60

〔0.83〕

AUTO ON（INVA）

orAUTO OFF（INVB）

45 to 525

〔29〕

②Two-Step Purge

Start/Stop Control

Upper

(purge start)

0.72

〔0.95〕0.70

〔0.93〕AUTO ON（INVA）

orAUTO OFF（INVB）

Lower

(purge stop)

0.67

〔0.90〕0.60

〔0.83〕

5 to 0Motor

stopped

③

Motor Stop/Restart Control

(AUTO operation)

Lower

(motor restart)

0.67

〔0.90〕0.60

〔0.83〕AUTO ON（INVA）

The DSP supports the 3 capacity control systems as above.

Depending on the varying air consumption, an appropriate system is automatically selected.

For more information, read the following page.

67


① CPCS Motor Speed ControlBased on the pressure signals detected by the pressure sensor, the built in circuit board’s CPU performs PID operations or calculates the motor speed that will meet the compressed air consumption rate, and then inputs the calculated results to the inverter. The inverter will output the instructions of the corresponding frequency to the motor. The discharge pressure is controlled with-in a targeted range due to the increasing and decreas-ing speeds of the motor.

Motor

P r essu r e Senso r

Constant P r essu r e of the Discha r ge Ai r

Comp r esse d Air

CPCS Motor Speed Cont r ol by Inverter and CP U

Inverter P r essu r e P: p r oportiona l

I : integral

D: di f fe r entia l

DSP

IMPORTANT

PID stands for Proportional, Integral, and Differential.

CPCS stands for Constant Pressure Control System.

② Two-Step Purge ControlTwo-Step Purge Control is activated if the following conditions below occur at the same time:

・ The operating frequency drops to 33 Hz (equivalent to 45% of the air consumption).

・ The pressure detected by the pressure sensor rises to an upper (purge-start) pressure point.

The blowof f solenoid valve (1) will operate to start purging the compressed air (contained between the airend and the check valve) to atmosphere. The sys-tem will decrease the operating frequency to its lowest operating frequency, 25 Hz, thus saving power. When the pressure detected by the pressure sensor drops to a lower (purge-stop) pressure point, the system increases the frequency to 33 Hz and the blowoff solenoid valve (1) reoperates to stop the purging, returning the sys-tem control back to CPCS Motor Speed Control.

（0.70MPa Models）

IMPORTANT

The differential range between the upper pressure point and the lower pressure point must be 0.05 MPa or more.

③ Motor Stop/Restart ControlMotor Stop/Restart Control will activated under one of the following conditions:

・Air consumption decreases to 5 %・ Purge operating continues for 3 minutes.The system will then automatically stop the motor. For protection, the motor can only be stopped once every 10 operating minutes. When the pressure detected by the pressure sensor drops to a lower (purge-stop) pressure point, the system will automatically restart the motor, returning the system control to CPCS Motor Speed Control.

① ② ①Pressure

Minimum0.05MPa

Minimum0.01MPa

Time

Upper Pressure

Standard Pressure

Lower Pressure

① ② ③

①② ②

③　③②

100

0

Hz＞33 Hz≦33Operation Frequency Hz

（Q≦45%）

Q≦5%　or　T≧3 minutesAir Consumption Q

orPurging Time T

Number of Motor Stopping N

(for 10 minutes)

Q＞5% or

T＜3 minutes

CPCS MotorSpeed Control

Two-Step PurgeStart/Stop Control

Motor Stop/RestartControl

N≦1

Air

Con

sum

ptio

nQ

(%

)

Time

N＞1

IMPORTANT

(1) Once the motor has stopped, it cannot restart for 15 seconds.

(2) The plant’s system pressure may drop drastically before the motor will restart, 15 seconds later. To avoid such problems, install an air receiver tank of 2.26 m3 or larger.

68


The incorporated ejector uses the compressed air to

generate a vacuum pressure, which maintains a nega-

tive pressure on the oil mist remover subsystem.

This prevents the gear case internal pressure from ris-

ing due to a resistance of the element. By installing the

oil mist remover:

(1) There is no need to extend a gear case vent pipe

outdoors, avoiding any type of trouble that may be

caused by incorrect installation of the gear case

vent pipe.

(2) Oil mists are prevented from venting from the DSP

gear case to atmosphere, keeping the DSP com-

pressor room/area clean.

(3) Oil expenses and labor costs to add extra oil are

lowered because the oil is automatically recovered

in the gear case.

8.5 Outline of Oil Mist Remover Subsystem

A small amount of oil mist is vented from the gear case vent pipe when starting the DSP.

The plant air system pressure rises and the ejector operates accordingly.

The oil mist remover internal pressure maintains a negative pressure.

The element removes oil mists without Increasing the gear case internal pressure.

The separated oil is recovered in the gear case and reused by the DSP.

Source ofCompressed Air

RegulatorFilter

Vacuum Indicator

Air Pressure Gauge Float Trap Solenoid Valve

Ejector

Gear Case

Air End

Oil Pump

Relief Valve ElementOpens when the gear case internal pressure excessively rises and needs relief to atmosphere.

Utilizes a high performan-ce element to separate the fine oil mists.

Uses the compressed air to generate a vacuum pressure, which maintains a negative pressure on the oil mist remover subsystem.

Indicates if the ejector is operating properly and keeping the gear case internal pressure is negative.

Removes dust particles and condensate from the compressed air.

Maintains a constant compressed air pressure.

Indicates the pressure of the compressed air at the inlet of the ejector.

Opens automatically when the oil has reached a specified level, returning the oil to the inlet of the oil pump.

Closes when the DSP has stopped, stopping the consumption of compressed air by the oil mist remover.

The oil mist remover reduces oil consumption to almost zero. However, The oil should still be replaced bi-annually.

69

8. STANDARD COMPONENTS AND SUBSYSTEMS [Outline of Oil Mist Remover Subsystem]

CAUTION

● Before you service the DSP, carefully read pages 2 through 5, Chapter 1 “SAFETY.”

● Before you service the DSP, disconnect the power; otherwise you may receive an electric shock.

● Before you remove or disassemble a bolt, pipe, or any other part of the DSP, stop it, disconnect the power, and make sure that the internal pressure has dropped to an atmospheric pressure. Otherwise the compressed air may gush out of the DSP.

(1) Daily fill the OPERATION RECORD LOGBOOK

( p. 115) and check the operating data and

conditions.

If the data deviates from the benchmark in the

logbook, service the DSP.

Overhauling consists changing the existing air end

with a new replacement air end.

Overhaul the DSP at 6 years.

9.1 Air Compressor Maintenance

① The DSP standard maintenance schedules are listed

in pages 71 through 74. Periodic maintenance inter-

vals in these schedules mean daily, monthly, half-

yearly, yearly, two-yearly, 4-yearly, and 6-yearly.

They are based on the normal environmental and

operating conditions. If your DSP is in sever envi-

ronmental and operating conditions, service it at

more frequent intervals.

Standard maintenance schedule (A) is based on

the 8,000 operating hours per year while (B) 4,000

hours. Select either (A) or (B) according to your

own operating hours per year. If your DSP is in

sever (high-humid, dusty, etc.) conditions, how-

Daily Operation Control1

Maintenance at Periodic Intervals2

Overhauling3

ever, always select (A) regardless of your operating

hours.

② Any of the maintenance intervals is not a warranty

period.

③ If the part you inspected is abnormal, faulty, or dam-

aged, replace it.

④ Do not neglect a yearly maintenance schedule as it

is most important from a preventive maintenance

standpoint.

⑤ Use HITACHI genuine parts for replacement.

70

9. MAINTAINING THE DSP

CAUTION

(2) Regularly drain the condensate and observe the

other daily operating instructions; see pages 10

through 11.

9. MAINTAINING THE DSP [Standard Maintenance Schedule]

SCHEDULE (A) (for yearly 8,000-or-less operating hours)

Follow this schedule (A) if the MAINTenance SCHEDULE: A appears on the display.

○●… Replace △○… Service the DSP by yourself.

△▲… Clean or Check ▲●… Ask your distributor to service the DSP.

9.2 Standard Maintenance Schedule

Bi-Annual Schedule (for yearly 8,000-or-less operating hours)2

Cooling Fan

Check Valve

Intercooler

Aftercooler

Oil Filter

Oil Cooler



Oil Mist Remover

Discharge Pipe (compressed air)

Oil Level Gauge

Common Base



Instrument Panel

High-Precooler

Daily/3-months Schedule (for yearly 8,000-or-less operating hours)1

Description MaintenanceClassification Model/Type

RemarksDaily Every

3 months Fixed/VSD Air/Water Cooled

LCD (Indications) Check △ Fixed/VSD Air/Water Cooled Fill in the OPERATION RECORD LOGBOOKOil Level Check △ Fixed/VSD Air/Water CooledAftercooler - Condensate Drain △ Fixed/VSD Air/Water CooledIntercooler - Condensate Drain △ Fixed/VSD Air/Water CooledControl Air Pipe - Condensate Drain △ Fixed Speed only Air/Water CooledMotor Grease ー △ Fixed/VSD Air/Water Cooled

Description Maintenance ClassificationModel/Type

RemarksFixed/VSD Air/Water Cooled

Lubricating Oil Replace ○ Fixed/VSD Air/Water CooledSafety Valve - Operation Check △ Fixed/VSD Air/Water CooledAir Intake Filter Clean △ Fixed/VSD Air/Water CooledOil Filter (secondary side) Check oil press. △ Fixed/VSD Air/Water Cooled Replace if necessary.Control Line Filter Clean △ Fixed Speed only Air/Water CooledAftercooler Drain Pipe Strainer Clean △ Fixed/VSD Air/Water CooledIntercooler Drain Pipe Strainer Clean △ Fixed/VSD Air/Water CooledAftercooler Drain Pipe Orifice Check/Clean ▲ Fixed/VSD Air/Water Cooled Clean if necessaryIntercooler Drain Pipe Orifice/Drain pipe check valve Check/Clean ▲ Fixed/VSD Air/Water Cooled Clean if necessaryOil Strainer (first side) Check/Clean ▲ Fixed/VSD Air/Water Cooled Clean if necessaryAftercooler (cooling air side) Check/Clean ▲ Fixed/VSD Air/Water Cooled Clean if necessaryIntercooler (cooling air side) Check/Clean ▲ Fixed/VSD Air/Water Cooled Clean if necessaryOil Cooler (cooling air side) Check/Clean ▲ Fixed/VSD Air/Water Cooled Clean if necessaryHi-Precooler (cooling air side) Check/Clean ▲ Fixed/VSD Air Cooled only Clean if necessaryCapacity Control Device Action (Purge air Solenoid for VSD) Check ▲ Fixed/VSD Air/Water CooledCheck Valve Leakage Check ▲ Fixed/VSD Air/Water Cooled

71

Annual Schedule (for yearly 8,000-or-less operating hours)3

2-Year Schedule (for yearly 8,000-or-less operating hours)4

6-Year Schedule: Overhauling (for yearly 8,000-or-less operating hours)5



Joints, Bolts, Nuts Tighten/Check △ Fixed/VSD Air/Water Cooled

Air Intake Filter Replace ○ Fixed/VSD Air/Water Cooled

Oil Filter (secondary side) Replace ○ Fixed/VSD Air/Water Cooled

Oil Strainer (first side) Clean ▲ Fixed/VSD Air/Water Cooled Replace if necessary.

Blow-off Valve Sheet Gasket Replace ● Fixed Speed only Air/Water Cooled

Suction Throttle Valve Seal Gasket Replace ● Fixed Speed only Air/Water Cooled

Thermistor, Pressure sensor, PCB, other Electric parts Check ▲ Fixed/VSD Air/Water Cooled Replace parts if failure found.

PCB for Variable Frequency Drive Check ▲ VSD only Air/Water Cooled Replace parts if failure found.

Aftercooler Check/Clean ▲ Fixed/VSD Air/Water Cooled

Intercooler Check/Clean ▲ Fixed/VSD Air/Water Cooled

Oil Cooler Check/Clean ▲ Fixed/VSD Air/Water Cooled

Hi-Precooler Check/Clean ▲ Fixed/VSD Air Cooled only

Demister for condensate separator Check/Clean ▲ VSD only Air Cooled only"3-way Solenoid Valve, Capacity Control Device (Suction Throttle Valve)" Check ▲ Fixed Speed only Air/Water Cooled Replace if necessary.

Purge air solenoid Check ▲ VSD only Air/Water Cooled

Safety Valve Check/Clean ▲ Fixed/VSD Air/Water Cooled

Protection, Safety Device Check ▲ Fixed/VSD Air/Water Cooled Replace parts if failure found.

Motor Check ▲ Fixed/VSD Air/Water Cooled Measure insulation resistance and clean.



Control Line Filter Element Replace ○ Fixed Speed only Air/Water CooledPurge air solenoid (For purge and anti-reverse rotaton in dectrical outage) Replace ● VSD only Air/Water Cooled

Oil Pump Oil Seal Replace ● Fixed/VSD Air/Water Cooled

Oil Pump Bearing Replace ● Fixed/VSD Air/Water Cooled

Check Valve Replace ● Fixed/VSD Air/Water Cooled

Drain Discharge Solenoid Valve Replace ● Fixed/VSD Air/Water Cooled Change togather with the strainer

Check valve for drainage Replace ● Fixed/VSD Air/Water Cooled

Check valve for control air piping Replace ● Fixed Speed only Air/Water Cooled

VFD (Variable Frequency Drive) Check ▲ VSD only Air/Water Cooled Clean the heat sink fin

Cooling Capacity for VFD Replace ● VSD only Air/Water Cooled



Air End Assembly (1st Stage, 2nd stage) Replace ● Fixed/VSD Air/Water Cooled Replace by overhauled Air End Ass'y.

Motor Bearing Replace ● Fixed/VSD Air/Water Cooled

Bearing for ventilation fan Replace ● Fixed/VSD Air/Water Cooled

Demister for condensate separator Replace ● VSD only Air Cooled only

3-way Solenoid Valve Replace ● Fixed Speed only Air/Water Cooled

Oil Strainer (first side) Replace ● Fixed/VSD Air/Water Cooled

Shaft Seal parts Check/Clean ▲ Fixed/VSD Air/Water Cooled

Temperature Control Valve Replace ● Fixed/VSD Air/Water Cooled

Smoothing Capacity for VFD Replace ● VSD only Air/Water Cooled

72


Bi-Annual Schedule (for yearly 4,000-or-less operating hours)2

Cooling Fan

Check Valve

Intercooler

Aftercooler

Oil Filter

Oil Cooler



Oil Mist Remover

Discharge Pipe (compressed air)

Oil Level Gauge

Common Base



Instrument Panel

High-Precooler

SCHEDULE (B) (for yearly 4,000-or-less operating hours)

Follow this schedule (B) if the MAINTenance SCHEDULE: B appears on the display.

○●… Replace △○… Service the DSP by yourself.

△▲… Clean or Check ▲●… Ask your distributor to service the DSP.

Daily Schedule (for yearly 4,000-or-less operating hours)1



LCD (Indications) Check △ Fixed/VSD Air/Water Cooled Fill in the OPERATION RECORD LOGBOOK

Oil Level Check △ Fixed/VSD Air/Water Cooled

Aftercooler - Condensate Drain △ Fixed/VSD Air/Water Cooled

Intercooler - Condensate Drain △ Fixed/VSD Air/Water Cooled

Control Air Pipe - Condensate Drain △ Fixed Speed only Air/Water Cooled



Lubricating Oil Replace ○ Fixed/VSD Air/Water CooledMotor Grease － △ Fixed/VSD Air/Water CooledSafety Valve - Operation Check △ Fixed/VSD Air/Water CooledAir Intake Filter Clean △ Fixed/VSD Air/Water CooledOil Filter (secondary side) Check oil press. △ Fixed/VSD Air/Water CooledControl Line Filter Clean △ Fixed Speed only Air/Water CooledAftercooler Drain Pipe Strainer Clean △ Fixed/VSD Air/Water CooledIntercooler Drain Pipe Strainer Clean △ Fixed/VSD Air/Water CooledAftercooler Drain Pipe Orifice Check/Clean ▲ Fixed/VSD Air/Water Cooled Clean if necessaryIntercooler Drain Pipe Orifice/Drain pipe check valve Check/Clean ▲ Fixed/VSD Air/Water Cooled Clean if necessaryOil Strainer (first side) Check/Clean ▲ Fixed/VSD Air/Water Cooled Clean if necessaryAftercooler (cooling air side) Check/Clean ▲ Fixed/VSD Air/Water Cooled Clean if necessaryIntercooler (cooling air side) Check/Clean ▲ Fixed/VSD Air/Water Cooled Clean if necessaryOil Cooler (cooling air side) Check/Clean ▲ Fixed/VSD Air/Water Cooled Clean if necessaryHi-Precooler (cooling air side) Check/Clean ▲ Fixed/VSD Air Cooled only Clean if necessaryCapacity Control Device Action (Purge air Solenoid for VSD) Check ▲ Fixed/VSD Air/Water CooledCheck Valve Leakage Check ▲ Fixed/VSD Air/Water Cooled

73


Annual Schedule (for yearly 4,000-or-less operating hours)3

3-Year Schedule (for yearly 4,000-or-less operating hours)4

6-Year Schedule: Overhauling (for yearly 4,000-or-less operating hours)5



Joints, Bolts, Nuts Tighten/Check △ Fixed/VSD Air/Water Cooled

Air Intake Filter Replace ○ Fixed/VSD Air/Water Cooled

Oil Strainer (first side) Clean △ Fixed/VSD Air/Water Cooled Replace if necessary.

Blow-off Valve Sheet Gasket Replace ● Fixed/VSD Air/Water Cooled

Suction Throttle Valve Seal Gasket Replace ● Fixed/VSD Air/Water Cooled

Thermistor, Pressure sensor, PCB, other Electric parts Check ▲ Fixed/VSD Air/Water Cooled Replace parts if failure found.

PCB for Variable Frequency Drive Check ▲ VSD only Air/Water Cooled Replace parts if failure found.

Aftercooler Check/Clean ▲ Fixed/VSD Air/Water Cooled

Intercooler Check/Clean ▲ Fixed/VSD Air/Water Cooled

Oil Cooler Check/Clean ▲ Fixed/VSD Air/Water Cooled

Hi-Precooler Check/Clean ▲ Fixed/VSD Air Cooled only

Demister for condensate separator Check/Clean ▲ VSD only Air Cooled only"3-way Solenoid Valve, Capacity Control Device (Suction Throttle Valve)" Check ▲ Fixed Speed only Air/Water Cooled Replace if necessary.

Purge air solenoid Check ▲ VSD only Air/Water Cooled

Safety Valve Check/Clean ▲ Fixed/VSD Air/Water Cooled

Protection, Safety Device Check ▲ Fixed/VSD Air/Water Cooled Replace parts if failure found.

Motor Check ▲ Fixed/VSD Air/Water Cooled Measure insulation resistance and clean.



Oil Filter (secondary side) Replace ○ Fixed/VSD Air/Water Cooled

Control Line Filter Element Replace ○ Fixed Speed only Air/Water CooledPurge air solenoid (For purge and anti-reverse rotaton in dectrical outage) Replace ● VSD only Air/Water Cooled

Oil Pump Oil Seal Replace ● Fixed/VSD Air/Water Cooled

Oil Pump Bearing Replace ● Fixed/VSD Air/Water Cooled

Check Valve Replace ● Fixed/VSD Air/Water Cooled

Drain Discharge Solenoid Valve Replace ● Fixed/VSD Air/Water Cooled Change together with the strainer

Check valve for drainage Replace ● Fixed/VSD Air/Water Cooled

Check valve for control air piping Replace ● Fixed Speed only Air/Water Cooled

VFD (Variable Frequency Drive) Check ▲ VSD only Air/Water Cooled Clean up heat sink fin

Cooling Capacity for VFD Replace ● VSD only Air/Water Cooled

NOTE: Replace every two years if you are using a power save operation.



Air End Assembly (1st Stage, 2nd stage) Replace ● Fixed/VSD Air/Water Cooled Replace by overhauled Air End Ass'y.

Motor Bearing Replace ● Fixed/VSD Air/Water Cooled

Bearing for ventilation fan Replace ● Fixed/VSD Air/Water Cooled

Demister for condensate separator Replace ● VSD only Air Cooled only

3-way Solenoid Valve Replace ● Fixed Speed only Air/Water Cooled

Oil Strainer (first side) Replace ● Fixed/VSD Air/Water Cooled

Shaft Seal parts Check/Clean ● Fixed/VSD Air/Water Cooled

Temperature Control Valve Replace ● Fixed/VSD Air/Water Cooled

Smoothing Capacity for VFD Replace ● VSD only Air/Water Cooled

74


① To keep your Oil Mist Remover in good operating

conditions for a long term, service it according to

the standard maintenance schedule below.

② The standard maintenance schedule is listed below.

Periodic maintenance intervals in this schedule are

based on the normal environmental and operating

conditions. If your Oil Mist Remover is in severe

environmental and operating conditions, service it at

more frequent intervals.

③ Any of the maintenance intervals is not a warranty

period.

④ If the part you inspected is abnormal, faulty, or dam-

aged, replace it.

⑤ ○●… Replace △▲… Clean or Check

　　○△ Service the Oil Mist Remover by yourself.

　　●▲ Ask your distributor to service the Oil Mist

Remover.

9.3 Oil Mist Remover Maintenance

The oil mist remover reduces oil consumption to almost zero. However, The oil should still be replaced bi-annually.

Part or ItemService Interval

RemarkDaily Half-Yearly Yearly 6-Yearly

Regulator - Settings △Vacuum Indicator △Relief Valve △Regulator - Performance △Float Trap - Nozzle △ Disassemble and clean.

Vacuum Indicator △ Disassemble and clean.

Air Filter -Element △ Disassemble and clean.

Remover - Element ●Air Filter -Element ●Relief Valve - Sheet & Spring ●Vacuum Indicator ●

Regulator ● Disassemble and clean.Replace diaphragm and valve stem.

Ejector ▲ Disassemble and clean.Replace if it is too dirty.

Solenoid Valve ▲ Disassemble and clean.Replace as required.

Solenoid Valve - Coil Assembly ●

75

9. MAINTAINING THE DSP [Oil Mist Remover Maintenance]

CAUTION

Before servicing the DSP air compressor, stop it, disconnect the power (turn off the earth leakage (ground) circuit breaker) and verify that the compressor’s internal pressure has dropped to atmospheric pressure.

The maintenance intervals shown refer to the standard Maintenance Schedule (A).

9.4 How to Service the DSP Air Compressor

A differential pressure sensor is provided on the suc-

tion throttle valve to detect the pressure dif ferential

across the air intake filter. When the sensor detects a

pressure differential as large as 4.98 kPa (0.7psi) dur-

ing operation, AIR FILTER CLOG appears on the dis-

play. If this occurs, clean or replace the air intake filter

in accordance with Maintenance Schedule (A) or (B).

The procedure for cleaning the air intake filter is as fol-

lows:

① Stop the DSP air compressor and turn off the main

power supply.

② Remove the front cover.

③ Remove the filter cover and wipe away the dirt from

inside the filter duct.

④ Loosen the wing nut and remove the filter element.

Remove large dirt by tapping the filter element light-

ly, and clean the inside by blowing the remaining

dirt with compressed air.

⑤ If the filter element is excessively dirty, clean by

immersing in for about 30 minutes in a neutral deter-

gent diluted with water. After doing so, rinse well

with clean water (max. water pressure 0.27 MPa).

Shake off the excess water and allow it to dry.

⑥ After making sure the filter element is dry, mount

the filter element in the filter duct and fasten with

the wing nut.

Air Intake Filter – (Replace Bi-Annually)1

Differential Pressure Sensor

Air IntakeFilter Cover

Air Intake Filter

Wing Nut

If the air intake filter is clogged with dust/dirt particles, less air is taken in and discharge air temperature rises. If the compressor room environment is dusty or dirty, service the air intake filter more frequently than instructed on the Maintenance Schedule.

76

9. MAINTAINING THE DSP [How to Service the DSP Air Compressor]

CAUTION

Drain check (intercooler, after cooler) (monthly), strainer element (for drain) cleaning (bi-annually) orifice cleaning (annually)2

■ Drain condition check　 Condensate may drain from the compressor according to operating conditions (high humidity, etc.).

　 Check the drainage daily, periodically inspect and clean the strainer and orifices. For details concerning how to

check the drainage, see page 10. The solenoid valve of the intercooler and after cooler operates automatically every

20 seconds to discharge water together with air.

■ Strainer element cleaning　 The strainers for both the intercooler and after cool-

er must be cleaned.

① Stop the DSP air compressor and shut of f the

main power supply. Shut the gate valve of the dis-

charge piping.

② Make sure no air is coming out of the drain open-

ing (pressure is not applied to the strainer).

③ Remove the screws from the rear cover (1) with a

screwdriver (see part No. 967, page 109, 111).

④ Remove the cover of the strainer.

⑤ Remove the element from inside the strainer and

wash with water, etc.

⑥ Return the clean element to its former position in

the strainer.

Solenoid valve for drain

Strainer

Element

O-ring

Cover

LoosenTighten

◆ Strainer cleaning[Air-cooled intercooler, after cooler][Water-cooled after cooler]

[Water-cooled intercooler]

■ Orifice cleaning　 Inspect and clean the orifices annually. Be sure to

turn the compressor off before inspecting and/or

cleaning the orifices.

■ Strainer element / solenoid valve of drain replacement

　 Replace the solenoid valve of the drain and the

strainer element every 2 years (if operating 8000

hours per year) or 3 years (if operating 4000 hours

per year) with new parts.

Orifices

◆ Orifice cleaning

● Make sure a minute quantity of condensate drains from the intercooler discharge port every 20 seconds when loading the com-pressor.

● If no condensate comes out, clean the strainer element and orifices.

● If the compressor is operated with no con-densate being discharged, it could cause the inside of the compressor to rust and could result in a serious accident.

Strainer

Element

O-ring

Cover

Loosen

Tighten

77


CAUTION

Ⓔ

Ⓒ

Strainer

After cooler side

Intercooler side

2-way valve A

2-way valve B

3-way changeover valve Ⅰ

Ⓔ

Ⓐ

Ⓑ

Ⓓ

Ⓒ

Ⓕ

After cooler side

Intercooler side

2-way valve A

2-way valve B


After cooler side

Intercooler side

2-way valve A

2-way valve B


Ⓔ

Ⓐ

Ⓑ

Ⓓ

Ⓒ

Ⓕ

■ Cleaning the strainer element while the compressor is running

　 If the strainer needs to be cleaned while the com-

pressor is running, consult with your dealer or

Hitachi Ser vice Station. Under ordinar y circum-

stances, pressure is applied to the strainer while the

compressor is running. You should therefore exer-

cise maximum caution when removing the strainer.

(1) Intercooler side

① Switch 3-way changeover valve I on the intercool-

er side from the “A” side to the “B” side.

② Remove the element. Pressure is applied to the

strainer, so be extremely careful when opening

the cover of the strainer.

③ Clean the element and mount it by performing

the procedure in reverse order.

④ Switch 3-way changeover valve I on the intercool-

er side from the “B” side to the “A” side.

(2) After cooler side

① Switch 2-way valve A on the after cooler side

from the “C” side to the “D” side.

② Make sure 2-way valve B is fully closed (“E”

side). In this state, strainer side pressure is

drained.

③ Remove the strainer element. If 2-way valves A

and/or B are opened even the slightest amount,

pressure is applied to the strainer. You should

therefore make certain that the valves are fully

closed.

④ If 2-way valve B is opened to the “F” side in this

state, condensate can be drained while cleaning

the strainer element.

⑤ Place the cleaned element in its former position

in the strainer and mount by performing the pro-

cedure in reverse order.

⑥ Switch 2-way valve A on the after cooler side

from the “D” side to the “C” side. Also make sure

2-way valve B is fully closed.

◆ Procedure for disassembling the strainer element during operation

Air-Cooled

Water-Cooled

◆ Valve condition during conventional operation

Ⓔ

Ⓒ

After cooler side

Intercooler side

2-way valve A

2-way valve B


Air-Cooled

Water-Cooled

78


Lubricating oil replacement (Bi-Annually)3

● Change the oil regularly, as instructed in the standard maintenance schedule ( page 71-74). Neglecting to change the oil causes oil deterioration that could result in clog-ging of the oil strainer and a fire.

● Be sure to use the recommended lubricating oil given on page 10. Absolutely DO NOT mix different types of lubricating oil.

● Overfilling with lubricating oil may increase shaft power and result in rise in oil tempera-ture. Do not overfill with lubricating oil.

■ Oil drain① Turn off the main power and then remove the front

door [904], left door [912] and rear panel (1) [967].② Remove plug (5) (for oil air vent).③ Remove plugs (1), (2) and (3). Place an oil pan

beneath oil drain valves (1), (2) and (3), and drain the lubricating oil by valve operation. The dimen-sions of the oil pans should be approximately 75 × 250 × 350 mm.

④ Also place an oil pan beneath plug (4), remove plug (4) and drain the lubricating oil.

⑤ Replace the lubricating oil twice a year and clean the bottom of the oil casing once a year. Wipe away the sludge that builds up on the bottom of the oil pan of the oil casing with a sponge and replace with new oil.

⑥ Set oil drain valves (1), (2) and (3) to the closed side. Also fasten plugs (1), (2) (3), (4) and (5) in seal tape at their original positions by wrapping them with sealing tape.

Note: Oil drain valve (3), plug (3) and plug (5) are not included with the water-cooled type.

■ Oil supply⑦ Supply oil to the oil casing. Open the oil supply

plug on the oil casing and introduce new oil until the oil level gauge reaches the upper red line. (Do not exceed the yellow line when the oil is initially charged.)

■ Check/replenishment⑧ Turn on the power, press the START button and

turn the compressor off 5 – 6 seconds later.⑨ Check the height of the oil level on the oil level

gauge. The oil level drops when the lubricating oil flows to the piping, oil cooler and casing jacket (air-cooled type only).

⑩ Turn of the power and add oil from the oil supply port.⑪ After replenishing the oil, close the oil supply plug tightly.⑫ Turn the power back on, press the START button

and make sure the oil level is between the upper and lower red lines of the oil level gauge.

⑬ Make sure no oil leaks from the oil drain valve and plugs.

Hole for waste oil hose(Oil drain hose is not supplied with the compressor.)

Plug (5) (Oil air vent)

Oil pan

Left door

Front door

Air-Cooled

Air-cooled type Oil drain valve (3)(For draining oil cooler)

Rear panel (1)

Air-cooled type Plug (3)

Air-Cooled

Air-Cooled

Oil drain valve (1)(For draining oil casing)

Oil casing

Oil pan

Oil port

Oil filter

Plug (4)

Oil filter drain port

Oil port cover

Oil drain valve (2)(For draining oil casing)

Plug (1)

Plug (2)

Inspection port cover

Open

CloseOpen

Close

Yellow line

Oil level gauge

79


WARNING

① Stop the DSP air compressor off and shut off the

main power supply.

② Open oil drain valve (1) (see page 79) and drain the

lubricating oil from the oil casing.

③ Remove the strainer cover, remove the oil strainer

and clean it.

④ Replace the strainer element when overhauling the

DSP.

Clean Oil Strainer (primary side) – (Bi-Annually)4

Oil Strainer

Strainer cover

IMPORTANT

Oil pressure drops if the oil strainer becomes clogged.● V type　 If oil pressure drops to 0.08 MPa or lower when the

operating frequency is 45 Hz or higher, or to 0.04 MPa when it is below 45 Hz, the oil pressure relay automati-cally shuts the compressor off.

● Fixed speed type　 If oil pressure drops to 0.08 MPa or lower, the oil pres-

sure relay automatically shuts the compressor off.

① Stop the DSP air compressor and disconnect the

power.

② Drain the lubricating oil from inside the compressor

in accordance with page 68.

③ Place a pan under the oil filter.

④ Use a filter wrench to loosen and remove the oil fil-

ter from the oil support on the gear case. Remove

and replace the oil filter element.

⑤ Apply clean oil onto the filter O-ring. Tighten the oil

filter until the O-ring surface comes in contact with

the oil filter seating surface.

⑥ Seat the oil filter O-ring by tightening the filter with

both hands. Immediately after compressor restart

verify that there is no leaks on the oil filter.

Oil Filter (secondary) – (Replace Annually)5

Oil FilterOil PanOil pressure drops if the oil strainer becomes clogged.● V type　 If oil pressure drops to 0.08 MPa or lower when the

operating frequency is 45 Hz or higher, or to 0.04 MPa when it is below 45 Hz, the oil pressure relay automati-cally shuts the compressor off.

● Fixed speed type　 If oil pressure drops to 0.08 MPa or lower, the oil pres-

sure relay automatically shuts the compressor off.

IMPORTANT

80


Clean Control Line Filter – Clean (Bi-Annually)7

① Stop the DSP air compressor and disconnect the

power.

② Open the after cooler condensate drain valve to

depressurize the inside of the air compressor.

Verify that no compressed air is discharging out of

the drain valve. The control line filter must to be

de-pressurized before conducting any service on the

filter.

③ Remove the left enclosure panel.

④ Remove the control line filter element, and then use

an air nozzle to blow out the inside surface (reverse

flow action) of the control line filter element in order

to remove any dust particles.

⑤ Replace the element at least every 2 years.

During inspection of the operation of the safety relief valve, use the appropriate facial protection. High pressure air containing dust particles can cause severe injury.

Check Safety Relief Valve Operation – (Bi-Annually)6

Safety Relief Valve (insaide the cover)

Chain ofSafety Relief Valve

[Rear surface]

① Maintain the rated maximum discharge pressure of

the DSP (0.70MPa or 0.93MPa whichever is applica-

ble).

② Pull the chain connected to safety relief valve.

③ Verify that the safety relief valve operates properly

and let go the chain of the safety relief valve.

81


WARNING

Clean Coolers8Air-Cooled

１ Cleaning in the case of light dirt

① Remove the right side cover, the front cover and the

rear cover.

② Remove the right and left intake duct.

③ Remove the maintenance cover.

④ Introduce an air nozzle from the opening of the

maintenance cover and clean the cooler by blowing

with compressed air.

2 Disassembly (heavy dirt)

① Remove the enclosure panels.

② Drain the oil.

③ Disconnect all the sensor wires from the cooler.

④ Remove the piping and disconnect the coupling of

the air and oil piping.

⑤ Remove the drain hose.

⑥ Remove the cooler mounting bolts.

3 Cleaning/inspection (heavy dirt)

① Clean by blowing with a compressed air nozzle.

② In the case of significantly heavy dirt, spray with

or immerse in detergent and then blow with com-

pressed air.

③ Use the following detergents. For details on how to

use, see the instructions for the detergents.

Maintenance coverCooler duct plate (4)

Cooler duct plate (5)

Maintenance coverRight intake duct

Left intake duct Part Form Application Amount added

per literProcessing

timeService

temperature Packaging

F-1Alkaline liquid

Ordinary/heavy dirtStrit A additive

100 to 200g(10 to 20%)

10 to 20minutes

Room temperature to 40℃

20 kg plastic container

F-10Alkaline liquid

Heavy dirt100 to 200g(10 to 20%)

10 to 20minutes



AC-11Alkaline liquid

When oil adheres100 to 200g(10 to 20%)

10 to 20minutes



(Made by Gospel Chemical)

82


● Oil Cooler

Scale Removal Remove the oil cooler water chamber cover. Flush

with Rydlymeand use a brass wire brush to remove

the scale from the inner surfaces of the oil cooler

tube nest.

● Aftercooler/Intercooler If scale build up occurs often, contact the local

Hitachi distributor for scale removal.

Clean Coolers9

Oil Cooler

Wire-Brush

Water-Cooled

83


Check valve cover

Gasket

Gasket

Check valve

Cooler header

Flow direction (direction of arrow)

Check Valve – (Replace, 2-Yearly)10

１ Depressurizing the System

① Close the stop valve on the discharge air pipe.

② Drain the air from the drain valve on the down flow

side of the compressor discharge por t. Be sure

to check the discharge pressure gauge and make

sure there is atmospheric pressure between the dis-

charge valves.

2 Removing the Enclosure Panels

① Remove the front door and enclosure panels.

② Remove cooler ducts such as duct plate (1) and duct

plate (4).

3 Disassembling

① Remove the fastening bolts of the check valve cover.

② Remove the upper check valve cover, the gasket

check valve and gasket, in that order.

③ Be careful of the mounting direction of the check

valve.

4 Cleaning and Checking

① Sufficiently clean the check valve seat. Make sure

that no rust particles and/or fragmented gaskets are

left on the valve contacting surfaces.

② Sufficiently clean the check valve and check valve

cover. Make sure that no rust particles and/or frag-

mented gaskets are left on the packing contacting

surfaces.

Check valve assemblyDuct plate (1)

Partition plate (A)

Partition plate (B)Duct plate (4)

Upper check valve cover

Lower check valve cover

Flow direction (direction of arrow)

2 stage packing (1)

Gasket

Check valve

Gasket

Air-Cooled

Air-Cooled

Air-Cooled

Water-Cooled

84


(1) Battery life and specifications

● Commercially available batteries cannot be used.

Order batteries from your dealer.

● To replace batteries, turn of f the power and

replace within 15 minutes.

(2) Battery replacement methodWhen “battery replacement” is displayed for “Setting

/ connection inspection” on the LCD monitor,

replace the batteries. Be sure to turn the compressor

off before replacing the batteries.

① Remove the mounting screws on the part where

the buttons are to the right of the LCD unit.

② Insert the special tool that comes with the com-

pressor in the openings provided in 2 locations

on the right side of the LCD unit and remove the

LCD unit by lifting.

③ There are tabs for fastening the LCD unit on the

left side of the unit. When removing the LCD unit,

carefully pull out the right side so it comes off the

operation panel from the right.

④ The batteries are mounted on the back of the

LCD unit. Unplug the batteries from the con-

nector. The batteries are held in place by double

sided adhesive tape.

⑤ Replace with new batteries.

(3) Precautions concerning disposal of old batteriesEither return used batteries to your dealer or properly dispose of them through an industrial waste disposal contractor in accordance with the “Law concerning disposal and cleaning of discarded materials.” Used batteries are furthermore shorted if the posi-

tive and negative terminals come in contact with

each other or come in contact other metal objects,

and could cause the batteries to produce heart, rup-

ture or catch fire. Do not expose the batteries to fire.

Used batteries cannot be recharged.

Battery replacement (every 4 years)11

③

④

Fastening tabs

②Mounting screwsSpecial tool openings

Battery

⑤

LCD unit board

CN11 BT

Item Specs

Battery Coin type manganese dioxide lithium battery

Voltage 3V

Battery model 220mAh

Capacity CR2032

Special specs Lead wire connector connection

Replacement criteria Battery replacement display on LCD monitor

LifeApprox. 1 year with power off

Approx. 4 years under ordinary service conditions

85


① Checking the operating temperature The motor coil has a specified maximum allowable

temperature rise of 100℃, based on an ambient tem-

perature off 45℃.

If the motor is unusually hot during normal opera-

tion, regardless of the specified temperature rise,

investigate the cause of the excessive heat utilizing

the Motor Diagnostics and Troubleshooting chart

below.

② Cleaning Clean the motor periodically to prevent dust particles

from accumulating inside and outside of the motor.

When servicing the DSP, measure the insulation

resistance of the motor coil with a 500V megohmme-

ter and verify that the insulation resistance is 1MΩ

or more.

③ Disassembling In a severe environment (dirty, corrosive, high dust

or high powder), disassemble and service the motor

every two years. In a normal environment, disas-

semble and service the motor every four years. For

the most common motor problems, see the Motor Diagnostic and Troubleshooting chart below.

If the problem cannot be solved with the chart, con-

sult the local Hitachi distributor.

Motor - (Servicing)12

Motor Diagnostics and TroubleshootingPhenomenon

Cause Exc

essi

ve S

oun

d

Exc

essi

ve R

ota

tion

Exc

essi

ve V

ibra

tion

Hea

ted

Ther

mal

Rel

ay T

rip

ped

bre

aker

Tri

pp

ed

Ele

ctri

c Le

ak

Low

Insu

latio

n R

esis

tanc

e

Corrective Action

Fram

e

Bea

ring

Instal

lation

Loose botls ○ ◎ ○ Retighten the bolts.

Wir

ing

Poor gounding ◎ Ground properly.

Inadequate breaker capacity ○NOTE 3

◎ Replace with properly specified capacity breaker.

Broken wires ○ Install new wires.

Failed starter and switch contact ○ ○NOTE 3

Check the contacts and replace if necessary.

Envi

ronm

ent Dust accumulation reduced cooling performance ○ Properly clean motor.

Excessive ambient operating temperature ◎ ○ ◎ Improve the room ventilation or contact the local Hitachi distributor.

High humidity ◎ Contact the local Hitachi distributor.

Large external vibration/shock ◎ Take vibration and shock measurements.

Powe

r Sup

ply Phase-lacking operation ◎ ◎ ○ ◎ ◎ ○ Check the wire thickness and length and contact the local power utilities company.Widely dropped voltage ○ ○ ◎ ◎

Fluctuating voltage ○ ○ ○ ○ Contact the local power utilities company.

Load Overload ○ ◎ ◎ ○ Check the DSP capacity control system.

Thrust force by the machine ○ ○ ◎ Center the shaft.

Excessive bearing noise NOTE 2 ◎ ◎ ◎ ○ Contact the local Hitachi distributor.

Burnt motor coil NOTE 2 ○ ○ ○ ◎ ◎ ◎ ○ Contact the local Hitachi distributor.

NOTES:1. ◎ : Close relationship between the cause and type of problem, ○ : relationship between the cause and type of problem.2. Detect the fundamental cause of the problem and take corrective action.3. Breaker, switch and starter are hot.

86


Main Motor Greasing 13

Load-Sidebearing grease port

Anti-Load-Side bearing grease port

Grease pan Bolt with knob

Grease replenishment amount

ModelPower voltage

Load-Side bearing

Anti-Load Side bearing

DSP-90/100ALNDSP-90/100WLN

200 V Class

90g 70g

DSP-90/100AMNDSP-90/100WMN

400 V Class

90g 70g

DSP-100VAMNDSP-100VWMN

400 V Class

90g 70g


400 V Class

90g 70g

● Grease gun example　 Lever-type grease gun made by Yamada Corporation

(CH-400 Micro-hose [pin type SPK-1C])

The main motor bearings on both the load-side bearing

and anti-load-side require grease replenishment.

Replenish grease each 3 months (if the unit is operated

8000 - 4000 hours per year) or each 6 months (if the

unit is operated less than 4000 hours per year).

① Remove the front and rear covers.

② Use a grease gun (out of scope of supply) to grease

the bearings.

③ Use Hitachi genuine grease.

④ Periodically clean the grease pan.

Failure to periodically replenish grease could result in a serious accident such as motor coil burning.

87


CAUTION

Set Screw

Diaphragm

Valve Stem

Element

Cover

Baffle

Nut

φ8

3/8φ

12

Set Screw

Nut

Rubber Packing

Rubber Packing

O-Ring

Element

Cover

Vacuum Indicator

NutPlate

SpringSheet

Locked Joint

Pull down

Relief Valve

1. Oil Mist Remover Element - (Replace Annually)

① Remove the pipe (between the top of the oil mist

remover housing and the ejector) as required.

Remove the 4 set screws from the oil mist remover

housing.

Pull up the upper part of the housing.

② Remove the nut and the cover. Then, remove the ele-

ment.

③ Install a new element. Carefully seat the upper and

lower rubber gaskets on the element without allow-

ing any gaps.

④ Grease the O-ring,

replace the housing,

and tighten the set

screws diagonally

and evenly.

2. Filter/Regulator - (Replace the filter, ele-ment, diaphragm, valve stem Annually)

① Hold down, turn, and pull down the lever on the

cover. Remove the cover and baffle and replace the

element with a new element.

② Remove the upper 4 set screws and remove the

upper part of the regulator. Replace the diaphragm

and the valve stem with new components. Be careful

not to install the new diaphragm upside down.

3. Relief Valve (Replace the sheet and spring Annually)

① Turn the nut and remove the plate. Replace the

sheet and the spring with new components.

② Assemble all the parts with placing the spring at the

center of the valve.

4. Vacuum Indicator (Clean Bi-Annually and

Replace Annually)

① A dirty vacuum indicator may malfunction. Clean

Bi-annually and replace annually.

② Hold up and pull down the locked pipe joint. Pull

down the vacuum indicator.

5. Ejector (Clean Annually)

① If the ejector is dirty, performance may be reduced.

Disassemble and clean annually.

② Disassemble and clean as follows.

(1) Disconnect the control air tube at its detachable

connection.

(2) Loosen the nut (the nut can be turned independ-

ently from the ejector body) and disconnect the

ejector from the manifold.

(3) Remove the plastic case.

(4) Clean the ejector body with a neutral detergent

and dry it with an air nozzle. Assemble all of the

parts.

Oil Mist Remover14

88


① If the compressor is not to be used for a week or

more, be sure to press the UNLOAD STOP button

on the instrument panel.

The compressor then unloads for 5 minutes and

automatically stops when the compressor and its pip-

ing are dry.

② To prevent the inside of the compressor from rust-

ing, press the UNLOAD STOP button and dry the

compressor for 5 - 10 minutes a week.

③ Be sure to turn off the power if the compressor is

not to be used for an extended period of time.

● Failure to take measures to prevent rust could result in rusting due to humidity in the atmosphere or lack of oil film in the bearings, and could cause the compressor to freeze up or could result in damage to the bearings when operation is restarted.

● The UNLOAD STOP button is not only used when the compressor is to be idle for an extended period of time; it is also effective way to prevent the inside of the compressor from rusting during routine operation as well.

Unloading the compressor prior to stopping enables moisture in the second stage air end to be removed.Drying out the inside of the compressor is an effective way to prevent rust from developing in the 2-stage com-pressor when unused for an extended period of time.

IMPORTANT

モニタ


遠方

機能

電源

運転停止

運転状況

故障

運転管理

負荷

遠方

起動待ち

設定

自動

UP/　DOWN

警報

記憶


＋／－

AUTO

MONITOR

MENU

SET

SELECT/WIDE

2

RUNNING CONTROL

STARTREMOTE

1

FUNC

［× 10h］

ALARM

STR

REMOTE

RUNNING MODE

AUTO START

POWER

LOAD

RESETSHUTDOWN

STOP

MONITOR

UNLOAD STOP button

UNLOAD STOP

■ Performing unload stop during dual/backup operation and/or multiple unit control operation (optional)

　 If the compressor is to be idle for an extended peri-

od of time, turn off dual/backup operation and/or

multiple unit control operation, press the UNLOAD STOP button while the compressor is running and

dry out the compressor.

　 The UNLOAD STOP button is effective when opera-

tion control is set to “SINGLE.” For information on

operation control settings, see page 21.)

　 When restarting operation, return the operation con-

trol to the optional control settings.

89

10. PRECAUTIONS WHEN THE COMPRESSOR IS TO BE IDLE FOR AN EXTENDED PERIOD OF TIME

CAUTION

Gear Case Assembly

100

277278 235

233

234

232

233

375

887

322

307

334

370

389

G65

278

371

G64

135132

301

143

135

321

134

177

336

317

369

883

E83

396

326

399

398

324323

B32339

338

133

133183184

178

320

333

332370

375243200

277235

334

388

327

316

389 884

383

398

338

1

Ref. No. Description

100 First-Stage Air End132 Cover, 1st-stage air end discharge133 Cover, cooling-oil jacket134 Gasket, 1st-stage air end discharge cover135 Gasket, cooling-oil jacket Cover143 Pinion Gear, 1st-stage air end177 Cooling oil-jacket upper cover178 Gasket, oil-jacket upper cover183 Cooling oil-jacket lower cover184 Gasket, oil-jacket lower cover200 Second-Stage Air End232 Cover, 2nd-stage air end discharge233 Cover, cooling-oil jacket234 Gasket, 2nd-stage air end discharge cover235 Gasket, cooling-oil jacket Cover243 Pinion Gear, 2nd-stage air end277 Jacket Seat278 Gasket, Jacket seat301 Gear Case307 Gear, oil pump316 Gasket, oil filling port317 Plug, oil filling port320 Oil Nozzle (1)321 Oil Nozzle (2)322 O-Ring, 1st-stage air end323 O-Ring, cleaning cover324 Cover, cleaning326 O-Ring, oil pump327 Oil Pump332 Stud Bolt (1)333 Stud Bolt (2)334 Parallel Pin (1)336 Oil Level Gauge338 Cover, inspection cover339 O-Ring, cover369 O-Ring, (strainer cover)370 O-Ring, (Air end flange)371 O-Ring, 2nd-stage air end375 Parallel Pin (2)383 Relief Valve388 M6 Flat Head Bolt389 Gear Stopper396 Strainer Cover398 Seal Washer399 Packing, relief valve883 Oil Temperature Control Valve884 O-Ring887 Oil Drain ValveB32 FloatE83 O-RingG64 O-Ring 25G65 O-Ring 30

90

11. PARTS LIST

Motor Assembly2

415

426

425

462

302

401453454455

427

F72

306461

391393

419370

340


302 Pull Gear306 Pinion Gear, oil pump340 Key370 O-Ring391 Shaft Seal393 Gasket, shaft seal401 Motor415 O-Ring (motor flange)419 Cover, shaft seal425 Vibration lsolation Rubber426 Support Bolt, gear case427 Stad Bolt, motor support453 Bearing (Load-side)454 Bearing (Anti-Load-side)455 Grease461 Gear Shaft, oil pump462 M8 Flat Head BoltF72 Grease Pan

91

11. PARTS LIST

92

11. PARTS LIST

Suction Throttle Valve3


500 Suction Throttle Valve Assembly502 Body, STV511 Gasket, air cylinder512 Gasket, air end air intake513 Gasket, STV cover554 U Cover (1)555 O-RingF44 Air Intake DuctF46 O-Ring

554

513

502

F44

511

512

F46555

554

513

502

F44

511

512

F46

520

517

518

503520

522519

521

504510

533

506507

508 534

532

535

536

539525

530 529

514542

514

526

515

528

504

515

516

522

509

541537

540

527

558559

555

538

［Fixed speed type］

Ref. No. Description525 Tying Rod, air cylinder526 Cover, air cylinder527 O-Ring528 Baffle Plate529 Spring Washer (SUS)530 Nut532 Body, blowoff valve533 Guide534 Seal Washer, air cylinder535 Nut536 Wave Spring537 O-Ring538 O-Ring539 Needle Gasket540 O-Ring541 Snap Ring542 Spacer551 Set of Air Cylinder Consumable Parts554 U Cover (1)555 O-Ring558 Adjusting Bolt, suction bypass valve559 Seal Washer, suction bypass valve569 Grease, air cylinderF44 Air Intake DuctF46 O-Ring

Ref. No. Description500 Suction Throttle Valve Assembly501 Air Cylinder Assembly502 Body, STV503 Tube, air cylinder504 Cover, air cylinder506 Piston, blowoff valve507 Valve Sheet, blowoff valve piston508 Plate509 Spindle, air cylinder510 Rod Metal511 Gasket, air cylinder512 Gasket (1), air end air intake513 Gasket, STV cover514 Valve Plate, STV515 Seal Gasket (1)516 Seal Gasket (2)517 Piston, air cylinder518 Seal Gasket (3)519 Seal Gasket (4)520 O-Ring, air cylinder521 Seal Gasket (5)522 Bush, air cylinder

93

11. PARTS LIST

Coolers & Ventilating Fan (1)4

584

695

E48

685

586585

694

692

699

672587

698

697

691

693

E51


584 Partition (1)585 Partition (2)586 Partition (A)587 Partition (B)685 Duct Panel (1)691 Duct Panel (2)692 Duct Panel (3)693 Duct Panel (4)694 Duct Panel (5)695 Duct Panel (6)697 Duct Panel (7)698 Duct Panel (8)699 Duct Panel (9)672 Duct, air intakeE48 Rubber BushE51 Maintenance Cover


661 659

667

666

663

686

659

686

668

686

662

658

681

664

671

678

679

680

660658

680

686

686 686

679678


658 Duct Support (1)659 Duct Support (2)660 Duct Frame661 Duct Frame (1)662 Duct Frame (2)663 Duct Frame (3)664 Duct Frame (4)665 Duct Frame (5)666 Duct Frame (6)667 Duct Frame (7)668 Duct Frame (8)671 Duct, air exhaust678 Bell Mouth679 lmpeller680 Protective Cover681 Fan Motor686 Support, cooling fan

Air-Cooled

Air-Cooled

94

11. PARTS LIST

623

642

639

586

608

647

644

635

650

649

651

645

628

F47643

648

652

632

633 631

646

648

F47

F47

634

E51

E51

E51



586 Rubber Bush608 Aftercooler623 Intercooler628 Duct Panel (1)631 Support (1), base frame632 Support (2), base frame633 Support (3), base frame634 Support (4), base frame635 Support (5), base frame639 Oil cooler642 Duct Panel (2)643 Duct Panel (3)644 Duct Panel (4)645 Duct Panel (5)646 Duct Panel (6)647 Duct Panel (7)648 Duct Panel (8)649 Duct Panel (9)650 Duct Panel (10)651 Duct Panel (11)652 Duct Panel (12)E51 Maintenance CoverF47 Vibration Isolation Rubber

Air-Cooled

95

11. PARTS LIST



601 Shell, aftercooler602 Tube Nest, aftercooler605 Gasket, aftercooler tube nest608 Aftercooler Assembly610 Oil cooler Assembly611 Tube Nest, oil cooler612 Cover, oil cooler water chamber613 Gasket, oil cooler water chamber cover614 Cover, oil cooler615 Gasket, oil cooler cover623 Intercooler Assembly624 Shell, intercooler625 Tube Nest, intercooler626 Gasket, intercooler tube nest627 Support, oil cooler

601

605

602

625

626

624

614

615

611

613

612

627

623

608

610

Water-Cooled


Ref.No. Description

404 Ventilating Fan628 Duct Panel (1)629 Duct, air exhaust631 Support (1), base frame632 Support (2), base frame633 Support (3), base frame634 Support (4), base frame671 Duct (1), fan motor672 Duct (2), fan motor673 Duct (3), fan motor678 Support(2), fan motor679 Fan681 Fan Motor686 Support (1), fan motorE48 Rubber BushF47 Vibration Isolation RubberF49 Vibration Isolation Rubber

671

672

673

404

F49

629

628

634

631

633

632

671

672

673

678

679

681

686

E48

E48

F47

Water-Cooled［Fixed speed type］

96

11. PARTS LIST

Oil Pump5

329328

345356

363

355

353

354

378

343

362

342


300 Consumable Parts Kit, oil pump327 Oil Pump Assembly328 Bearing329 Oil Seal342 Body343 Housing, oil pump bearing345 Key353 Inner Rotor354 Outer Rotor355 Shaft356 Key362 Snap Ring363 O-Ring378 Bush Bearing

Instrument Panel6

744

749

757748

719

746


719 Digital Panel744 Lithium Battery746 Control PCB748 Seat, instrument panel749 Display Unit757 Screw

97

11. PARTS LIST

752

D75

702

701703

E46

D73

745D09

D08706

740

D06

E48

704

708

709

729

743

743

743

E47

E45

935

D14

931

D14

B72

720

Starter Box7


700 Starter Box Assembly701 Electromagnetic Contactor (42)702 Electromagnetic Contactor (6)703 Thermal Relay704 Electromagnetic Switch, ventilating fan motor706 Fuse708 Current Transformer709 Terminal Block720 Transformer729 Electromagnetic Contactor740 Enhancer Unit743 Rubber Bush745 Control Board752 Fuse931 Flat Handle935 HingeB72 Cover, Starter panelD06 Terminal BlockD08 Auxiliary RelayD09 Auxiliary RelayD14 MagnetD73 Protective RelayD75 TransformerE45 Rubber BushE46 Rubber BushE47 Rubber BushE48 Rubber Bush


700 Starter Box Assembly704 Electromagnetic Switch, ventilating fan motor706 Fuse708 Current Transformer709 Terminal Block720 Transformer729 Electromagnetic Contactor740 Enhancer Unit743 Rubber Bush745 Control Board752 Fuse931 Flat Handle935 HingeB72 Starter Box AssemblyD06 Terminal BlockD08 Auxiliary RelayD09 Auxiliary RelayD14 MagnetD73 Protective RelayD75 TransformerE04 Cooling Fan, inverter unitE05 Control Circuit Board, inverterE06 Power Supply Circuit Board, inverterE07 Smoothing CondenserE08 Main Circuit Board, InverterE16 Diode Module Circuit BoardE17 Inverter AssemblyE45 Rubber BushE46 Rubber BushE47 Rubber BushE48 Rubber Bush

［Fixed speed type］

752

E05

E07

E46

D73745

D09D08

706

740

D06

E48

704

708709

729

743

743

743

E47

E45

935

D14

931

D14

B72

720

E04

E16 E06

E17

E08

D75

98

11. PARTS LIST

Air Piping8

F10

035

F01

023

003

867

035

034

040

036

027

D71

024037

039

D70

025

021

026

868

F66

871

870

D72

098

670

875

874

036

F11036

868

022

035

035

035038

029

F65

F49

F47

Air-Cooled


003 Condensate Separator021 Demister022 Air Piping (1)023 Air Piping (2)024 Air Piping (3)025 Air Piping (4)026 Air Piping (5)027 Air Piping (6)029 Air Piping (8)034 Gasket, 1st-stage air end discharge flange035 Gasket, 1st-stage036 Gasket, 2nd-stage (1)037 Gasket, 2nd-stage suction038 O-Ring, 2nd-stage suction039 Gasket, 2nd-stage air end discharge flange040 Gasket, 2nd-stage (2)098 Flexible Piping, 2nd-stage discharge670 High-Precooler867 Gasket, aftercooler868 Cover, check valve870 Gasket871 Check Valve874 Discharge Piping875 Safety ValveD70 Thermistor (1)D71 Thermistor (2)D72 Thermistor (3)F01 Air Piping (10)F10 Safety Valve SeatF11 Support, discharge pipingF47 Vibration Isolation RubberF49 Fix Board, separatorF65 Condensate Water Separator SeatF66 O-Ring, condensate water separator seat

99

11. PARTS LIST

Air Piping8

875

874

033

001

002

010

869

870

871

870

868

F05

F09

040

F09

F04

F03

040

F09

F02

F09040

F01D71

039

037

029

028

035

027

D72

003

F66F65

010

044

035

024

035

023

D70

022

035

034

038

056

021

058

020026

035

002

038

Water-Cooled


039 Gasket, 2nd-stage air end discharge flange040 Gasket, 2nd-stage044 Intercooler Header (2)056 Inner Piping058 Bolt868 Cover, check valve869 Aftercooler Header (2)870 Gasket871 Check Valve874 Discharge Piping875 Safety ValveD70 Thermistor (1)D71 Thermistor (2)D72 Thermistor (3)F01 Air Piping (11)F02 Air Piping (12)F03 Air Piping (13)F04 Air Piping (14)F05 Air Piping (15)F09 Discharge FlangeF65 Intercooler Header CoverF66 O-Ring, Intercooler Header Cover


001 Aftercooler Header (1)002 O-Ring (cooler)003 Intercooler Header (1)010 Gasket, cooler header020 Demister021 Demister022 Air Piping (1)023 Air Piping (2)024 Air Piping (3)026 Air Piping (6)027 Air Piping (7)028 Air Piping (8)029 Air Piping (9)033 O-Ring, 2nd-stage discharge034 Gasket, 1st-stage air end discharge flange035 Gasket, 1st-stage037 Gasket, 2nd-stage suction038 Gasket, 2nd-stage suction (2)

100

11. PARTS LIST

ⒶへⒶ

043

F68

F67

F69 F80 H01H02 045

H01H02

045

F80

F40

F48

F48

H75

876


043 Check Valve045 Orifice, condensate piping876 2 way Valve (1)F40 Drain Piping SeatF48 Vibration Isolation RubberF67 3 way Switching ValveF68 Support (H), drain pipingF69 Support (L), drain pipingF80 Drain Solenoid ValveH01 Strainer ElementH02 O-ring, strainer elementF76 2 way Valve (2)

Condensate Piping9

Condensate Piping9

Air-Cooled

Water-Cooled

047007

006

043

F80876

H75

045

045

F48

F40

F69

F68

F67

H01H02


006 IC Strainer Assy007 Gasket, IC strainer043 Check Valve045 Orifice, condensate piping047 IC Strainer Element876 2 way Valve (1)F40 Drain Piping SeatF48 Vibration Isolation RubberF67 3 way Switching ValveF68 Support (H), drain pipingF69 Support (L), drain pipingF80 Condensate Solenoid ValveH01 Strainer ElementH02 O-Ring, strainer elementH75 2 way Valve (2)

101

11. PARTS LIST

Oil Piping (1)10

887

D34

775F31

776

890


775 Oil Piping (3)776 Oil Piping (4)887 Oil Drain Valve890 Flexible PipingD34 O-RingF31 Gear Case Breathing Piping

Air-Cooled

Oil Piping (1)10

890 F31

D34

F32

H73

Water-CooledRef. No. Description

890 Flexible PipingD34 O-Ring (gear case breathing)F31 Gear Case Breathing PipingF32 Oil Piping FittingH73 O-Ring (oil cooler fitting)

102

11. PARTS LIST

Oil Piping (2)10

D35

771

H67

882

888

H66

770

D81

880

D35

226

D35

774

773

D52

D35

H67


226 Solenoid Valve, oil drain770 Oil Piping (OP suction)771 Oil Piping (OP discharge)773 Oil Drain Piping (1)774 Oil Drain Piping (2)880 Oil Strainer882 Oil Filter Element888 Oil Temperature SensorD35 O-RingD52 Oil Nozzle (1)D81 Oil Nozzle (2)H66 O-Ring (OP suction)H67 O-Ring (OP discharge)

Cooling Water Piping11008

009

011

013

012

015

016

017

014


008 Piping (1)009 Piping (2)011 Pet Cock012 Piping (3)013 Seat (1), cooling water piping014 Seat (2), cooling water piping015 Seat (3), cooling water piping016 Stop Valve (1), for a water flow control017 Stop Valve (2), for a water flow control

Water-Cooled

Air-Cooled Water-Cooled

103

11. PARTS LIST

Blowoff Air Piping12

902900

901

E94

A86


900 Blowoff Silencer901 Seat, blowoff silencer902 Cover, blowoff silencerA86 Piping Fitting (φ35)E94 Blowoff Air Piping


900 Blowoff Silencer (H)901 Seat, blowoff silencer (H)902 Cover, blowoff silencer (H)D29 Seat (1L), blowoff piping E21 Blowoff Solenoid Valve (1H)E22 Blowoff Solenoid Valve (2)E23 Seat (1H), blowoff piping E34 Support, blowoff solenoid valveE68 Blowoff Solenoid Valve (1L)E69 Seat, blowoff silencer (L)E70 Cover, blowoff silencer (L)E79 Blowoff Silencer (L)E94 Blowoff Air Piping (H)E96 Blowoff Air Piping (L)G62 Piping fitting

Air-Cooled ［Fixed speed type］

902

G62

E94

E22

E96

E22

E69

E21

E34

E79E70

901

900

E68G62

G62

E23

D29

104

11. PARTS LIST

Blowoff Air Piping12

E95

902

901

900

E94

A86

A86


900 Blowoff Silencer901 Seat, blowoff silencer902 Cover, blowoff silencerA86 Piping Fitting (φ35)E94 Blowoff Air Piping (H1)E95 Blowoff Air Piping (H2)

Water-Cooled［Fixed speed type］

E94

E96E95

G62

G62

G62

G62

G62

G62

D29 E68

E69E79

E70

E34

902

901

E21

E23

E22


900 Blowoff Silencer (H)901 Seat, blowoff silencer (H)902 Cover, blowoff silencer (H)D29 Seat (1L), blowoff piping E21 Blowoff Solenoid Valve (1H)E22 Blowoff Solenoid Valve (2)E23 Seat (1H), blowoff piping E34 Support, blowoff solenoid valveE68 Blowoff Solenoid Valve (1L)E69 Seat, blowoff silencer (L)E70 Cover, blowoff silencer (L)E79 Blowoff Silencer (L)E94 Blowoff Air Piping (H1)E95 Blowoff Air Piping (H2)E96 Blowoff Air Piping (L)G62 Piping Fitting (φ28)

105

11. PARTS LIST

Control Air Piping13

898

D26

849

D99

D79

D26

019

892

085799

A82

A80

A82

A80

A81

E40

H63

899


019 Check Valve085 O-ring, control line filter799 Element, control line filter849 Support, pressure sensor892 Support plate, solenoid valve898 Pressure Differential Indicator899 Solenoid Valve ManifoldA80 Transparent HoseA81 Hose ConnectorA82 Wire ClampD26 Pressure SensorD79 Filter NippleD99 Interstage Pressure SensorE40 Seat (1), pressure detecting pipeH63 Seat (2), pressure detecting pipe

Air-Cooled ［Fixed speed type］

106

11. PARTS LIST


898

D26

849

D99

D79

D26

E40

H63


849 Support, pressure sensor898 Pressure Differential IndicatorD26 Pressure SensorD79 Filter NippleD99 Interstage Pressure SensorE40 Seat (1), pressure detecting pipeH63 Seat (2), pressure detecting pipe

Air-Cooled

107

11. PARTS LIST


D26

892

899

019

085799

A82

A80

A82

A81

898

D79

D26

D99849


019 Check Valve085 O-ring, control line filter799 Element, control line filter849 Support, pressure sensor892 Support plate, solenoid valve898 Pressure Differential Indicator899 Solenoid Valve ManifoldA80 Transparent HoseA81 Hose ConnectorA82 Wire ClampD26 Pressure SensorD79 Filter NippleD99 Interstage Pressure Sensor

Water-Cooled ［Fixed speed type］

108

11. PARTS LIST


Water-Cooled

D26

E40

849

D26D99

D79898


849 Support, pressure sensor898 Pressure Differential IndicatorD26 Pressure SensorD79 Filter NippleD99 Interstage Pressure SensorE40 Seat (1), pressure detecting pipe

109

11. PARTS LIST

938

952912

H69

909

945

H72

969

907

926

H68

986984

911

982

981

H59

951

970

915

983

944

905

929

A71

908

953

942

924

D25

985

906

904

910

939

938

A71

D25

D25

D25 H68

946

925

947

913

914

941

E88

E88

H70

H70

H70D14

H68

H60

H71

H61

967

943

Air-Cooled

Enclosure (1)14


904 Front Door905 Front-Lower Panel906 Front-Upper Panel907 Left Panel (2)908 Right-Upper Panel909 Right-Lower Panel910 Left Panel (1)911 Rear Panel (2)912 Left Door913 Top Panel (1)914 Top Panel (2)915 Cover, air exhaust924 Cover (1), power cord925 Cover (1), piping926 Cover (2), piping929 Rubber Bushing, control cable938 Handle


939 Rubber Bushing941 Top Frame942 Common Base943 Left-Corner Frame944 Front Frame945 Right-Corner Frame946 Rear-Upper Frame947 Rear-Center Frame951 Left-Upper Frame952 Right-Upper Frame953 Instrument Panel967 Rear Panel (1)969 Right Frame970 Left Frame981 Support, Cover (1)982 Support, Cover (2)－－


983 Support, Cover (3)984 Support, Cover (4)985 Support, Cover (5)986 Support, Cover (6)A71 Fork Slot CoverD14 MagnetD25 ChainE88 MagnetH59 Left-Corner CapH60 Right-Corner CapH61 Seal PlateH68 SupportH69 SupportH70 M6 Exterior ScrewH71 Magnet Rubber (1)H72 Magnet Rubber (2)－－

110

11. PARTS LIST

Enclosure (2)14

E71

978

E72

974903

E67

E71

E75

975932

E72E64

973

976

E74

E65

E75

E28

977

E28

E66

949

922

E67

E73

933

E66

E65

E64

E53

E52

E77

E52

D85

E76

E78

E53

981

982

948

972


903 Cover, air intake filter duct922 Air Intake Filter932 Wing Nut933 Stud Bolt948 Support, Duct (6)949 Duct, air intake filter972 Support, air intake filter duct973 Duct-Upper, air intake974 Duct-Lower, air intake975 Cover (1), motor duct976 Duct (1), motor977 Duct (2), motor978 Cover (2), motor duct981 Duct (1), ventilating fan982 Duct (2), ventilating fanD85 Support (1), motor ductE28 Duct (3), louveE52 Handle (1)E53 Handle (2)E64 Board (1), air intake ductE65 Board (2), air intake ductE66 Duct (1), louveE67 Duct (2), louveE71 Support, Duct (1)E72 Support, Duct (2)E73 Support, Duct (3)E74 Support, Duct (4)E75 Support, Duct (5)E76 Support (2), motor ductE77 Duct (4), louveE78 Duct (5), louve

Air-Cooled

111

11. PARTS LIST

Enclosure (1)14

914

913

H60

914

925938

912

907

H59951

910

D25

D25

E88

E88

D25

H70

H70

H70

D14953

D25

905

904

A71942

A71

945

982 983

H68

985

941

984981

H68

H68

H69

909

929

908

924

939

938

986

952

H61

H61

970

967

947

946

926

H71 911969

D91

906 943

944

Water-Cooled


904 Front Door905 Front-Lower Panel906 Front-Upper Panel907 Left Panel (2)908 Right-Upper Panel909 Right-Lower Panel910 Left Panel (1)911 Rear Panel (2)912 Left Door913 Top Panel (1)914 Top Panel (2)915 Cover, air exhaust924 Cover (1), power cord925 Cover (1), piping926 Cover (2), piping929 Rubber Bushing, control cable938 Handle


939 Rubber Bushing941 Top Frame942 Common Base943 Left-Corner Frame944 Front Frame945 Right-Corner Frame946 Rear-Upper Frame947 Rear-Center Frame951 Left-Upper Frame952 Right-Upper Frame953 Instrument Panel967 Rear Panel (1)969 Right Frame970 Left Frame981 Support, Cover (1)982 Support, Cover (2)－－


983 Support, Cover (3)984 Support, Cover (4)985 Support, Cover (5)986 Support, Cover (6)A71 Fork Slot CoverD14 MagnetD25 ChainD91 Seal PlateE88 MagnetH59 Left-Corner CapH60 Right-Corner CapH61 Seal PlateH68 SupportH69 SupportH70 M6 Exterior ScrewH71 Magnet Rubber (1)－－

112

11. PARTS LIST

Enclosure (2)14

978

974903

975932

973

976

977

949

922

933

D85

E76

981

982

948

972

Water-CooledRef. No. Description

903 Cover, air intake filter duct922 Air Intake Filter932 Wing Nut933 Stud Bolt948 Support, Duct (6)949 Duct, air intake filter972 Support, air intake filter duct973 Duct-Upper, air intake974 Duct-Lower, air intake975 Cover (1), motor duct976 Duct (1), motor977 Duct (2), motor978 Cover (2), motor duct981 Duct (1), ventilating fan982 Duct (2), ventilating fanD85 Support (1), motor ductE76 Support (2), motor duct

113

11. PARTS LIST

D45 D40

D37

D41

D44

D43

D39

D42

D38

D46

D48

D47

D49

D78

φ8

φ12

3/8

φ8

Oil Mist Remover15

Ref.No. Description

D37 ElementD38 O-RingD39 Solenoid ValveD40 Pressure GaugeD41 EjectorD42 Vacuum IndicatorD43 Valve SheetD44 Valve SpringD45 Air Filter/Air Pressure RegulatorD46 Diaphragm, air pressure regulatorD47 Valve Stem, air pressure regulatorD48 Element, air filterD49 Float TrapD78 Packing

12.1 Limited WarrantyThis Limited Warranty applies to products manufactured by Hitachi Industrial Equipment Systems Co., Ltd. (as

HIES hereinafter).

Warranty PeriodThe warranty period is 12 (twelve) calendar months after the date of the product delivery or 18 (eighteen) cal-

endar months after the date of the product shipping (as indicated by the bill of lading), whichever passes ear-

lier.

Limitation of the WarrantyIn the warranty period, HIES will only supplies the replacement parts or product. However, this is only applied

ifthey break down in the correct usage condition,according to Instruction Manual and the notification on the

product label.This Limited Warranty does not extend in the following cases.

(1) Product over the warranty period.(2) Product failed or damaged as a result of misuse or negligence of warnings, cautions, and instructions

asindiated on the labels on the product and the Instruction Manual.(3) Product failed or damaged as a result of repair or modification by anyone other than HIES and an

authorized HIES distributor, who is not professional with the product.(4) Product failed or damaged as a result of not using HIES genuine parts. (5) Product’s parts to be periodically replaced or serviced according to the labels on the product and the

Instruction Manual,(6) Product failed or damaged as a result of fire, earthquake, flood, thunderbolt or any other natural disaster

and the use of abnormal power supply voltage (higher or lower than the rated voltage ±10%).(7) Product failed or damaged as a result of the use in abnormal environmental conditions as follows:

Installation location: Outdoors.

Ambient temperature: Lower than 5 degree C or higher than 45 degree C.

Ambient humidity: Higher than 90%.

Surrounding environment: Inflammable, combustible or explosive gas or dust contained, corrosive gas

contained, or metal or cement powder, sand, a ball of dust contained.

HIES shall not liable for any indirect or consequential damages caused by the failed product, including any lost

production or sales.

Contact your distributor to obtain warranty services if necessary.

12.2 After-Sales ServiceIf you have a problem when using the product, read the section 4, “TROUBLESHOOTING,” carefully and examine

the problem by yourself. If you still cannot find the answer, contact your distributor and declare the following infor-

mation:

● Model (TYPE)● Serial Number (MFG. NO.)

Check the nameplate on the product

● Total Operating Hours and Delivery Date● Your Problem● Customer’s Operation Interruption Condition

｝

114

12. WARRANTY, AFTER-SALES AND SERVICE

Date Time

Motor1st-Stage Air End

2nd-Stage Air End

2nd-Stage

Suction Air

Temperature

℃

Ambient

Temperature

℃

Oil

Temperature

℃

Oil

Pressure

MPa

Load

Ratio

%

Quantity of

Cooling

Water

ℓ

出力

kW

Total

Operation

Hours

h

Daily Control Remarks

Voltage

V

Current

A

Temperature

℃

Pressure

MPa

Temperature

℃

Pressure

MPaIntercooler Aftercooler

Condensate

Drain Trap

Oil

Level(Parts Change etc.)

Air-Cooled

Benchmarks(Fixed speed type)

220（220）or lessWhen loading:0.27 or lessWhen unloading:-0.08～0

225（255）or less0.70（0.93）or less

68or less

45or less

68or less

0.12 to

0.18

Condensatedrained

Condensatedrained

Condensatedrained

In oil levelgauge

Air-Cooled

Benchmarks(V type)

225（225）When loading:0.30 or less0.02～0.10（Purging）

225（255）or less0.70（0.93）or less

68or less

45or less

68or less

0.08 to 0.18（0.04 to 0.16）※1

Condensatedrained

Condensatedrained － In oil level

gauge

Water-Cooled

Benchmarks(Fixed speed type)

210（210）or lessWhen loading:0.27 or lessWhen unloading:-0.08～0

215（245）or less0.70（0.93）or less

65or less

45or less

65or less

0.12 to

0.18

Condensatedrained

Condensatedrained

Condensatedrained

In oil levelgauge

Water-Cooled

Benchmarks(V type)

215（215）When loading:0.30 or less0.02～0.10（Purging）

215（245）or less0.70（0.93）or less

65or less

45or less

65or less

0.08 to 0.18（0.04 to 0.16）※1

Condensatedrained

Condensatedrained － In oil level

gauge

NOTES: 1. The □ marked items as well as the number of loading times are indicated on the LCD.2. The values in the parentheses are for the working pressure of 0.93 MPa.3. Regarding ※mark, upper figure is for 45Hz driving frequency, lower figure in ( ) is for less than 45Hz driving frequency.

115

13. OPERATION RECORD LOGBOOK

Model DSP-90A5NDSP-90A6N

DSP-100A5NDSP-100A6N

DSP-120A5NDSP-120A6N

DSP-100VA5NDSP-100VA6N

Air

Co

mp

ress

or

Discharge Pressure MPa 0.70/0.93 0.70/0.93 0.70/0.93 0.70/0.93Ambient Operating Pressure and Temperature ℃ Atmospheric Pressure, 0 to 45 Atmospheric Pressure, 0 to 45Gases Handled － Air AirCapacity m3/min 16.6/13.9 18.0/15.4 20.5/17.3 18.0/15.4Air End Shaft Power kW 103.5 115.0 138.0 115.0No. of Compression Stage － Two Stage Two StageDriving Method － Direct Coupling + Gear Driven Direct Coupling + Gear DrivenMotor Starting Method － Star-Delta Starting InverterDischarge Air Pipe Connection inch 2 (flange connection) 2 (flange connection)Discharge Air Temperature ℃ Atmospheric Temperature + 15, or less Atmospheric Temperature + 15, or lessOil System Capacity L 26 (Not filled) 26 (Not filled)Capacity Control System － Offl ine or online, 0％ or 100％, 2-step control by suction throttle valve Variable Speed + Purge +

Motor Auto start/stop control

Oil Cooler/Aftercooler/ Intercooler － Corrugated Fin Structure with Aluminum Slitted-Fin Corrugated Fin Structure

with Aluminum Slitted-Fin

Mai

n M

otor

(50

Hz) Nominal Output kW 90 100 120 100

Type － 2 Pole Totally Enclosed Motor 2 Pole Totally Enclosed MotorVoltage Ｖ 200 380/400/415 200 380/400/415 380/400/415 380/400/415Current A 370 190/185/185 410 210/205/205 240/240/240 210/205/205Frequency Hz 50 50Number of Pole － 2-Pole 2-PoleInsulation Class － Class F Class F

Mai

n M

otor

(60


Type － 2 Pole Totally Enclosed Motor 2 Pole Totally Enclosed MotorVoltage Ｖ 220 440 220 440 440 440Current A 340 170 375 185 210 185Frequency Hz 60 60Number of Pole － 2-Pole 2-PoleInsulation Class － Class F Class F

Coo

ling

Fan

Mot

or (1

)(2)

(5

0Hz)

Nominal Output kW 1.1×2 1.5×2 1.5×2Type － TCW4903BH Totally-Enclosed PN-604-15H PN-604-15HVoltage Ｖ 200 380/400/415 200 380/400/415 380/400/415 380/400/415Current A 4.6 2.4/2.3/2.2 4.6 2.4/2.3/2.2 3.4/3.4/3.4 3.4/3.4/3.4Frequency Hz 50 50Number of Pole － 4-Pole 4-PoleInsulation Class － Class E Class E

Coo

ling

Fan

Mot

or (1

)(2)

( 60H

z)

Nominal Output kW 1.1×2 1.5×2 1.5×2Type － TCW4903BH Totally-Enclosed PN-604-15H PN-604-15HVoltage Ｖ 220 440 220 440 440 440Current A 4.2 2.1 4.2 2.1 3.3 3.3Frequency Hz 60 60Number of Pole － 4-Pole 4-PoleInsulation Class － Class E Class E

Total Weight kg 2,250 2,400 2,350External Dimensions (W×D×H) mm 2,150×1,520×1,975 2,150×1,520×1,975

NOTE: 1. The capacity values in above table are converted values in response to the suction condition. For guaranteed values, please contact your nearest dealer or Hitachi local representative offices. 2. The earth leakage circuit breakers are out of scope of supply from Hitachi. 3. DSP NEXT series compressors are not designed, intended or approved for breathing air applications. 4. Pressures are indicated as the gauge pressure. 5. Motor Output values are nominal outputs. 6. DSP NEXT series cannot run in excess of 45℃ of ambient temperature. Ventilation and/or air conditions should be considered to main-

tain the compressor room temperature. 7. For the quality of the cooling water for water-cooled models, please contact your nearest dealer or Hitachi local representative offices. 8. Install the DSP indoors and avoid flammable and corrosive environment, moisture and dust. 9. Choose 3.5 - 4.5 ton duty fork truck for transportation of the DSP’s. 10. Hitachi may make improvements and/or changes in the appearance and/or specifications described in this publication at anytime with-

out notice.

116

14. STANDARD SPECIFICATIONS

Air-Cooled

Model DSP-90W5NDSP-90W6N

DSP-100W5NDSP-100W6N

DSP-120W5NDSP-120W6N

DSP-100VW5NDSP-100VW6N

Air

Co

mp

ress

or

Discharge Pressure MPa 0.70/0.93 0.70/0.93 0.70/0.93 0.70/0.93Ambient Operating Pressure and Temperature ℃ Atmospheric Pressure, 0 to 45 Atmospheric Pressure, 0 to 45Gases Handled － Air AirCapacity m3/min 16.8/14.0 18.3/15.6 21.0/17.6 18.3/15.6Air End Shaft Power kW 103.5 115.0 135.0 115.0No. of Compression Stage － Two Stage Two StageDriving Method － Direct Coupling + Gear Driven Direct Coupling + Gear DrivenMotor Starting Method － Star-Delta Starting InverterDischarge Air Pipe Connection inch 2 (flange connection) 2 (flange connection)Discharge Air Temperature ℃ Cooling Water Temperature 13, or less Cooling Water Temperature 13, or lessCooling Water Pipe Connection inch 1-1/2 1-1/2Cooling Water Temperature ℃ 35 or less 35 or lessCooling Water Quantity m3/min 160 180 160Oil System Capacity L 16 (Not filled) 16 (Not filled)Capacity Control System － Offl ine or online, 0％ or 100％, 2-step control by suction throttle valve Variable Speed + Purge +

Motor Auto start/stop control

Oil Cooler － Water-Cooled Horizontal Shell-and-Tube Type (Water: inside, Oil: outside)Intercooler － Water-Cooled Horizontal Shell-and-Tube Type (Water: outside, Air: inside)Aftercooler － Water-Cooled Horizontal Shell-and-Tube Type (Water: outside, Air: inside)

Mai

n M

otor

(50


Type － 2 Pole Totally Enclosed Motor 2 Pole Totally Enclosed MotorVoltage Ｖ 200 380/400/415 200 380/400/415 380/400/415 380/400/415Current A 370 190/185/185 410 210/205/205 240/240/240 210/205/205Frequency Hz 50 50Number of Pole － 2-Pole 2-PoleInsulation Class － Class F Class F

Mai

n M

otor

(60


Type － 2 Pole Totally Enclosed Motor 2 Pole Totally Enclosed MotorVoltage Ｖ 220 440 220 440 440 440Current A 340 170 375 185 210 185Frequency Hz 60 60Number of Pole － 2-Pole 2-PoleInsulation Class － Class F Class F

Coo

ling

Fan

Mot

or (1

)(2)

(50H

z)

Nominal Output kW

－

0.2×2Type － PN-404-02HVoltage Ｖ 380/400/415Current A 0.5/0.5/0.6Frequency Hz 50Number of Pole － 4-PoleInsulation Class － Class E

Coo

ling

Fan

Mot

or (1

)(2)

(60H

z)

Nominal Output kW

－

0.2×2Type － PN-404-02HVoltage Ｖ 440Current A 0.6Frequency Hz 60Number of Pole － 4-PoleInsulation Class － Class E

Total Weight kg 2,100 2,250 2,200External Dimensions (W×D×H) mm 2,150×1,520×1,825 2,150×1,520×1,825

NOTE: 1. The capacity values in above table are converted values in response to the suction condition. For guaranteed values, please contact your nearest dealer or Hitachi local representative offices. 2. The earth leakage circuit breakers are out of scope of supply from Hitachi. 3. DSP NEXT series compressors are not designed, intended or approved for breathing air applications. 4. Pressures are indicated as the gauge pressure. 5. Motor Output values are nominal outputs. 6. DSP NEXT series cannot run in excess of 45℃ of ambient temperature. Ventilation and/or air conditions should be considered to main-

tain the compressor room temperature. 7. For the quality of the cooling water for water-cooled models, please contact your nearest dealer or Hitachi local representative offices. 8. Install the DSP indoors and avoid flammable and corrosive environment, moisture and dust. 9. Choose 3.5 - 4.5 ton duty fork truck for transportation of the DSP’s. 10. Hitachi may make improvements and/or changes in the appearance and/or specifications described in this publication at anytime with-

out notice.117

14. STANDARD SPECIFICATIONS

Water-Cooled

Printed in JapanDSA-575 2010.2

Note down your Compressor’s Specifications for reference in the future.

Hitachi Industrial Equipment Systems Co.,Ltd.

Model DSP- kW 　Hz

Compressor Serial No.

Installed on day month year

Start-Up on day month year

Purchased from Phone : Sales Person :

huong dan su dung may nen khi khong dau hitachi dsp 90-120 vawn

Engineering