diesel lay-out pdc

Diesel-Loco Layout(Electrical)

S.K.Sinha

What is a Diesel Loco-

• A diesel loco essentially consists of a diesel engine which converts heat energy into mechanical energy for the movement of the loco.

• The above mechanical energy is transmitted to the axles of the loco through some hydraulic or electric means. (Called Hydraulic or Electrical Transmission)

[ Engine- Hydraulic or electrical transmission system-Axles]

• Today, Electrical Transmission is more prevalent .

There are three types of Electrical transmissions

[ Engine- Generator-TM -Axles]

• DC-DC

• AC-DC

• AC-AC

DC-DC Transmission

Diesel EngineTraction

Alternator

Traction Motors

Wheels

Aux M/csAC Gen

DC Motors

Rectifier

AC – DC Transmission

AC-Transmission

Radiator Room Expressor Room Engine Room Generator Room Control Compartments

DB Cab Room

Nose Compartment

Under

Carriage

Lay Out of Diesel Loco (WDM-2)

Distribution Of the main Electrical Components

• Nose Compartment→ Dynamic Brake Grids(12 No.) & Dynamic Brake Blower Motor,Batteries(2 No., placed in the outer right side )

• Cab Room →L/H & S/H Control Stands Throttle Handle, Selector Handle, Reverser Handle, Load Meter, Electrical Speedo Meter, Low Water Switch, Auto Flasher light unit ,OPS etc .

• Control Compartment →Front Part- Relays , Contactors, VRP,TRP.ECP,Ex.CP, ACCR,LAS, Emergency Switch,BKT,Reverer and other controlling devices shown on the next slide

• →Back Part –FS Contactors, R1 &R2 contactors, Resistors etc

• Generator Room →Aux. Gen., Exciter Gen.,FTM Blower, Tr. Gen./Alternator, Rectifier Block (If Alternator is used),Batteries(6 No., placed just outside of the room near the railing))

• Engine Room →Tacho Gen., Governor, Crankcase Exhauster Motor

• Expressor Room →Fuel Pump Motor

• Radiator Room →Eddy Current Clutch Coil Assembly,

• Under Carriage →Tr.Motors and their Cables, Axle Generator, Cyclonic Filter Motor

Dynamic Braking Grid Blower1.It is a DC motor located in nose compartment2. .Its function is to cool dynamic grids during dynamic braking. These grids get heated up when current passes in these grids during braking3..The Blowers supply sufficient air for cooling the grids upwards direction and hot air will be exhausted through the louvers.

Nose Compartment Component

CAB Room Component

A. Master controller.-

It is manually operated cam actuated, multiple contact switches for closing, opening or holding circuits in a sequence. The controller has the handles.i,e Throttle handle, Reverser handle, Selector handle.

1.Reverser Handle-Reverser has three positions FORWARD ,OFF &REVERSE for selecting the desired direction. RH can be moved only when TH is in IDLE position and OFF or NO 1.motoring position. RH can be installed or removed only when in OFF position

.

3.Selector handle:-It has ‘’OFF’’ position with “MOTORING’’ position to the left & ‘’BREAKING.’’ to the right.

2.Throttle handle: -This handle utilized to control speed of engine. It has an IDLE position or “O” and eight. running notches

CAB Room Component

Front View of Control Compartment (Front Part)

Control Compartment (Front View)

Braking and Traction Contactor(BKT) - 2/1 no BKT fitted in front panel of control compartment at bottom.

BKT1-Control Tms.1,4,3,6

BKT2- Control Tms.2,5

Operated by control air pressure and magnet valve.BKT has 2 position

1.Motoring-Armature & field of traction motor connected in series and act as Motor

2.Braking - -Armature & field of traction motor connected separately and TM act as TG during Dynamic Braking.

Note- Some Locos are fitted with only 1no BKT.


REVERER CONTACTOR-

The function of reverser is to change the current position of TM field by which TM armature rotation can be

RESERVED/FORWARD direction.

02/01 reverser contactor-fitted control compartment at bottom REV1&REV2.REV1- control Tms 1,4,3,6REV2- control Tms 2,5 Operated by Control air pressure and magnet valve.

a) Magnet valve.It is an electro pneumatically operated valve which control the flow of compressed air to and from electro pneumatic apparatus.


Circuit Breakers-Work as safety device which trips at its rated currant and save the other components of the same rating

connected in the same circuit

MB1 BatteryBreaker

200A MFPB2 Master Fuel Pump

30A

MB2 ControlBreaker

150A MCB1 MainControl Breaker-1

15A

CEB Crankcase Exhauster

15A MCB2 MainControl Br.-2

15A

FPB Fuel Pump 30A AGFB Aux. Gen. Br.

15A

MFPB1 Master FP 30A


SR Signal Relay ---------------------

When LOP,LWS,Hot Engine, GR, GFOLR

GR/GR1 & GR2

Ground ---------------- ---------------------------

DMR Dead’s man --------------PCS Loco comes to idle & Dynamic brake will also released.

BKR-1 to3 Braking Dynamic Brake

Engine generates 4th notch power & M/G voltage comesdown1.6-28V

WSR-1 to 3 Wheel Slip ----------------------

FSR Field Shunt Field weakening Transition

FSC21 &25 operated and then FS22,23,24,26 operated & weaken the TMs’ Field

TR Transition ----------------------

-----------------------------

GFOLR Gen.Field Alternator ------------------------------

ERR Engine Run Woodward Gov.

For notching up A,B,C,D valves will be excited N/O ERR contacts.

Important RelaysControl Compartment (Front View)

SR(SIGNAL RELAY)-This relay gets energized in event of safety devices and operates the Alarm Gong for providing Audio Signal.

DMR(Demagnetising relay/Dead’s men relay)-This relay gets operated after MCB are put on.If there is a train parting or chain pulling ,DMR gets de energized through PCS and bring the engine toIDLE,irrespective to TH positions.


Electrical Gauges

• Load meter

• Electric speedometer

• Battery ammeter Control Compartment Component

Control Stand Component

LOAD METER-1.It is a colour band device to be used as guide for correct loco operations.2.The pointer on the colour band indicates the relative amount of tractive effort being developed by the loco.and load current on the TMs3.The green zone represents normal operating current& conditions. In this zone ,operating time is unrestricted 4.The yellow zone indicates short time capacity of TM.The indicated marks on yellow zone indicate the maximum time allowed.The max time allowed in the yellow zone,is 50 minutes.

Field shunt contactors-six nos fitted back part of control compartment

It is electro magnetic devices which open and close electrical circuits .This contactor introduce the field shunting resistor to the traction motor field.

FSC pickup at the of series parallel shunt &parallel shunt combination.

Control Compartment (Back Part) components

Electrical Rotating Components

• Traction Generator/ Alternator• Exciter Generator• Auxiliary Generator• Traction Motor Blowers ( FTTM, RTTM)• Traction Motors• Axle Generator• Fuel Pump Motor• Tacho Generator• Crank Case Exhauster Motor• Cyclonic Filter motor• Eddy Current Clutch Coil assembly

• Traction Generator- It is separately excited Dc Generator

Function- Supply the current to Traction Motor

• Technical Specification-• No load voltage -770 VDC

• Speed of armature - 400-1000rpm

• Alternator-It is 3phase A.C generator• Function- Supply the current to Traction Motor

• Technical Specification-

• No load voltage -980 VDC(WDM2) - 1130 VDC(WDG3A/WDG4)

. Speed of Rotor -400-1000rpm

Generator Room Component

Auxiliary Generator

1. 4-pole self excited Dc machine

2. Mounted on TG gear box and driven by the bull gear

3. Function-

a.Charging of battery

b.Excite the field of Exciter

c.Current supply to Control circuit, FPM, CCM,ECC& lighting circuit

4.Technical Specification-

Rating - 72+_1VDC

Current - 160amp

speed - 950 to 2386.rpm Horse power- 12 H.P

Generator Room Compartment

EXCITER

• 1. 4-pole separately excited

Dc machine• 2 Mounted on TG gear box

and driven by the bull gear• 3 Specially designed to

excite the field of Main Generator

• 4..Technical Specification-• Rating- 85-200VDC• speed- 950 to2386.rpm •

Horse power- 12H.P


FRONT TRUCK TRACTION MOTOR BLOWER (FTTM)

FTTM blower is gear driven from the main generator shaft and supplies air to the motors no 1,2,3 in the truck below the cabin.

FTTM BLOWER


TRACTION MOTOR----------------------------------This is DC series MotorTechnical Specification- Max Voltage-600V Max Current - 980 amp speed (Armature) - 2275 rpm Horse power- 400 H.P

Function-1. Traction motor convert the electric power delivered by the traction generator into mechanical power, to drive the wheel.

2. During dynamic braking traction motors acts as generator.

Under Carriage Compartment

FUEL PUMP MOTOR-This motor is located on right side of the engine in expressor room.

-It gets the current from auxiliary source.

- It is a DC motor and it is used to drive governor oil pump and fuel oil pumps.

-Fuel oil pump is towards generator end where as the governor oil pump is towards the radiator room.

Technical Specification- 1.Rated output HP-1.5

2.voltage-72v

3.current-21A

4.Speed-1725RPM.

Expressor Room Components

.1. It is an AC generator that control engine speed.

2.Its main shaft gear is driven by cam shaft gear of the diesel engine and hence it generates an output signal having a frequency proportional to the engine speed.

3. Its outputs are supplied to the (i) Mixer-Reference Circuits (Card No.188)(ii) Function Generator Circuits

(Card No.292)

(iii) Speed coil circuits ,if there is EH Governor.

TACHO GENERATOREngine Room Component

CRANK CASE EXHAUSTER MOTOR

This motor is located on the left side of the engine above no-8 cylinder-It is DC compound motor. Which is used to rotate a blower to exhaust the oil fumes and vapors from the engine crank case&it creates vacuum above 1.5” - 2”.Technical specification-Max voltage-75vMax current-4.9 AMPHorse power-0.5hpSpeed -3000rpm

Engine Room ComponentEngine Room Component

AXLE GENERATOR

generator, which is fitted on L-2 axle.

- Its single- phase voltage output is utilized for Electrical.speedometer to indicate locomotive speed& transitions.

-It is an axle driven AC

Under Carriage Component

Dynamic Braking Grid Blower1.It is a DC motor located in nose compartment2. .Its function is to cool dynamic grids during dynamic braking. These grids get heated up when current passes in these grids during braking3..The Blowers supply sufficient air for cooling the grids upwards direction and hot air will be exhausted through the louvers.

Nose Compartment Component

Thank Y

ou

diesel lay-out pdc

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