FD8413 Issue01QFE Electrical Installation

Installation

QFE

1

2. ELECTRICAL INSTALLATION 2

2.1 Warnings 2

2.2 Electrical Connections: QFE Chassis Size 1 3

2.3 Standard Wiring Configurations 3

2.4 MOTOR CONTROL CIRCUITS 6

2.5 Electrical Connections QFE and QFEplus 9

2.6 Supply Connections 13

2.7 Control Card Connections 14

2.9 Typical Load Power Rating for QFE Units 16

2.10 Fuse and Current Ratings 17

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2.ELECTRICAL INSTALLATION

2.1 Warnings

2.1.1 Isolation

Caution:The QFE uses semiconductor devices in the main circuit and is not designed toprovide isolation. For this reason isolation means must be installed in the supply circuit inaccordance with the appropriate wiring and safety regulations.

2.1.2 Electrical Control Supply Requirements

All Models All electrical connections are made to power input and output terminals, controlterminals and an earth stud . Before you apply the control voltage to the control supply terminals,ensure that the selector switch is set to the voltage being used. The diagrams in sections 2.5shows the location of this selector switch. Only make electrical connections to those terminalsspecified. If you connect to other terminals, then you may cause damage to the internalcontrol circuitry. 2.1.3 Access

Caution: Always replace the cover panel on the unit after gaining access to theelectrical connections.

2.1.4 Fuse Protection

The Mains Supply and the Control Supply each require protection. Although all units haveelectronic overload protection for the motor load, the installer should always place fuse protectionbetween the unit and the Mains Supply, not between the unit and the motor. Semiconductorfuses can be supplied as an option for short-circuit protection of the semiconductors. Thesefuses cannot be fitted within QFE chassis size 1 models, and must be mounted externally by theuser. For chassis size 2 and size 3, the user can fit fuses internally by replacing the fuse links inthe power circuit.

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2.2 Electrical Connections: QFE Chassis Size 1

2.2.1 Electrical Supplies

The unit requires two AC supplies: A 3-phase balanced Mains Supply to provide the powerfor the controlled motor.

A single-phase supply: 115V/230V, 50Hz/60Hz, for the internal control circuitry.

The unit will not operate unless the control supply voltage is within the specified limits.It is recommended that the control supply is maintained between starts to ensure overloadintegrity, as the overload resets on control supply removal.

2.2.2 Power, Control and Earth Terminations

ChassisSize

Power Terminals L1, L2, L3 and T1, T2, T3

1 and 2 M8 metric threaded studs.

3 Two M10 fixings per connection

Control Terminals X1, X2

1, 2 and3

Screw clamp terminals suitable for solid or stranded conductor.

Conductor size: 0.5 mm2 (minimum), 2.5mm2 (maximum)

Electrical Ground (Earth) Terminal

1 and 2 Single M8 metric threaded stud.

3 Two M10 metric threaded studs.

2.3 Standard Wiring ConfigurationsThere are two standard wiring configurations for the connection of a motor, a motorcontroller (Soft Start) and the mains supply:

Configuration 1: In-Line connection for Delta and Star (Wye) Connected Motors

This is the recommended connection and is suitable for most motors.

Configuration 2: In-Delta connection for Delta Connected Motors

If required the QFE can be placed within the delta windings.

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2.3.1 Wiring Diagram for In-line Connection of Motors

110V/230VControl Supply

EmergencyStop

STOP

START

K2

K2K1

K2.2

InductionMotor

QFE, QFEplus

L1 L2 L3

T1 T2 T3

EARTHSTUD

S0, 00

S1

X2

X1

24

21

14

11

EARTH(ElectricalGround)

Isolation and Protection Switch-gear(provided by the customer)

K1

Feedercables

Mains SupplyBusbar

L1L2L3

CircuitContactor

Figure 2.3.1 In-line Connection for Motors

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2.3.2 Wiring Diagram for In-Delta connection of motors

InductionMotor

Feedercables

K1

T1 T2 T3

Mains Supply (Ue)

L1 L2 L3

Control

Supply (Us)

EARTH(Electrical

Ground)

U1V1

V2W2

W1

U2

Isolation and ProtectionSwitchgear (provided

by customer)

X1

X2

EARTHSTUD

QFE UNIT

In-delta connections forcorrect rotation of motor

Terml Fwd Rev

T1 W1 V1T2 V1 W1T3 U1 U1L1 V2 W2L2 U2 U2L3 W2 V2

Figure 2.3.2 In-Delta connection for Delta connected induction motors

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2.4 MOTOR CONTROL CIRCUITS

2.4.1 Motor BypassingA separate bypass contactor may be connected in parallel with the QFE or QFEplus. This allowsa solid connection of the motor to the mains supply that eliminates the heating effect associatedwith thyristor losses. Soft-starting and Soft-stoppingremain active as normal. At the completion of thestarting ramp, a bypass contactor is closed around themain connections to remove the thyristors from circuit.The contactor is controlled by a programmable relay setas a ‘Top of Ramp’ relay. This configuration ensuresthat bypassing only occurs when the motor terminalvoltage is at mains voltage. The adjacent diagramsshow typical power and contactor control circuits forbypassing.The motor bypassing configuration requires that youselect the protection mode to either START+BYPASSor PHASE LOSS ONLY.

K1

Mains SupplyBusbar

L1L2L3

CircuitContactor

BypassContactor

QFEQFEplus

L3L2L1

T3T2T1

K2

Motor Power Circuit

115V/230VControl Supply

EmergencyStop

STOP

START

K3.1

K3K1

K3.2

QFEQFEplus

S0, 00

S1

X2

X1

24

21

14

11

ContactorControlCircuit

K2

Figure 2.4.1:Motor Bypassing Power and Contactor ControlCircuits

QFE

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2.4.2 Multiple Motor StartingThe QFE is capable of starting parallel-connected motors simultaneously provided each motorhas similar characteristics and load. For such configurations, the rating of the QFE should meetor exceed the total power rating for all the motors.

Alternatively, the QFE can start motors sequentially using bypass contactors under the control ofthe programmable relay set as a ‘Top of Ramp’ relay. The dual setting feature of the QFEenables the control of individual groups of motors with different start-up requirements. (Forfurther details on multiple motor applications, consult the supplier.)

2.4.3 External Motor Protection RelayThe rating for a motor protection relay should be as for Direct-on-Line (DOL) starting, and if it isan electronic relay, then the user should confirm it's suitability for use with a soft-starter. If themotor load is high-inertia (extended start time) then a longer trip time may be required.

2.4.4 Motor ReversingThe diagram in figure 2.4.6 shows a typical motor reversing circuit using two contactors, K1 andK2, to interchange two phases of the 3-phase supply connections. For this application the soft stop must be set to zero.

It is also recommended that: -

A period of 150 - 350 ms elapses between the FORWARD and REVERSE commands

If the reversing rate is high, the QFE current rating may need to be selected based on thestarting duty; refer to sections 1.5.13(a) and 1.5.13(b).

2.4.5 Connection of an External Current TransformerFor the QFE and QFEplus it is possible to connect an external current transformer to theinternally mounted electronic control card. (For further details, consult the supplier.)

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2.4.6 Wiring diagram for Motor Reversing

FORWARD

REVERSE

K2

14

13

22

21

K1

K1

14

13

22

21

K2

K2

A2

A1

K1

A2

A1

S0, 0014X2

QFE, QFEplus

S111X1

Contactor ControlCircuit

Control Supply

EmergencyStop

Enable

STOP

Power Circuit MainsSupplyBusbar

L1L2L3

K1K2

Fuses

Isolator

QFE QFEplus

L3L2L1

T3T2T1

Motor

Figure 2.4.6: Typical Power and Contactor Control Circuit for Motor Reversing

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2.5 Electrical Connections QFE and QFEplus

2.5.1 Chassis Size1 and 2

Cover(inside view)

T3T2T1

L3L2L1

ElectronicControl Card

AuxiliaryFunction Card

X1,

X2

X1,

X2

size

1 size2

size

1

size

2

EARTH STUDElectrical ground (PE)An M8 threaded stud for connection to the system earth.

ELECTRONIC CONTROL CARDRefer to sections 2.5.3 and 2.7.1

AUXILIARY FUNCTION CARD(QFE plus only). Refer to section2.5.4 and 2.7.2.

POWER TERMINALS T1, T2, T3 (Output)Induction motor. For correct motorrotation, these connections mustcorrespond with the supply connectionsat L1, L2, L3.

POWER TERMINALS L1, L2, L3 (Input)Isolatable 3-phase supply (via contactor,isolator, etc.). Any phase can connect toany terminal.

KEYPAD CIRCUITCARD

CABLE

To remove cover, unscrew2 positions size 14 positions size 2

CONTROL VOLTAGE TERMINALS X1, X2 (Input) CONTROL VOLTAGE SELECTOR SWITCHEnsure that the selector switch position corresponds to the control supply used, either 110V or 230V, before you apply the control supply.

Figure 2.5.1 QFE and QFEplus Chassis Size 1 and 2 Electrical Connections

Take care when you remove and replace the cover not to damage the cable thatinterconnects the keypad circuit card and the electronics control card.

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2.5.2 Chassis Size 3

T1 T2 T3

L1 L2 L3

200 200

30Hingedcover

To open covers, unscrew in 4 positions

AuxiliaryFunction Card

Hingedcover

AUXILIARY FUNCTION CARD(QFE plus only) Refer to sections 2.5.4 and 2.7.2.

KEYPAD CIRCUIT CARD

ELECTRONIC CONTROL CARDRefer to sections 2.5.3 and 2.7.1

POWER TERMINALS T1, T2, T3 (Output) to Induction motor. For correct motor rotation, these connections must correspond with the supply connections at L1, L2, L3.

CONTROL VOLTAGE TERMINALS X1, X2 (Input)CONTROL VOLTAGE SELECTOR SWITCHEnsure that the selector switch position corresponds to the control supply used, either 115V or 230V, before you apply the control supply.

POWER TERMINALS L1, L2, L3 (Input)Isolatable 3-phase supply (via contactor,isolator, etc.). Any phase can connect toany terminal.

EARTH STUD Electrical ground (PE)An M10 threaded stud for connection to the system earth. Alternative at top.

Figure 2.5.2: QFEplus Chassis Size 3 Electrical Connections

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2.5.3 Electronic Control Card

J7 Ribbon cableconnectorto auxiliaryFunction Card

J1*

J4J3*J2*

D5J5*J6*

J8 J9 J10

RelayK1

RelayK2

ElectronicControl Card

J11

22 24 21 12 14 11

J13*Connectionto chassis mountedpower device

J14*Connectionto chassis mountedpower device

J12*Connectionto chassis mountedpower device

nc th/sw

Thermal switch input for monitoring the unit heatsink temperature, normally-closed. (For manufacturer’s use only.)

Programmable Input, Control Input 1 (S1, S0).A voltage applied to these terminals will either SET or CLEAR the parameter/bit mapped by P65. Default: Start/Stop

Programmable output, Relay K1.Change-over contacts that can be mapped from a selected parameter.Default: - Run Relay

Programmable output, Relay K2.Change-over contacts that can be mapped from a selected parameter. Default: Top of Ramp

D5 (Green)Indicates the presence of the control supply.

Keypad connection header.* INTERNAL FACTORYFITTED CONNECTIONS:J1, J2, J3, J5, J6,J12, J13 and J14.

Figure 2.5.3: Electronic Control Card Electrical Connections

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2.5.4 Auxiliary Function Card (QFEplus only)

4-20

mA

0V

0 -1

20V

0 -2

1V

AN

2

AN

1

0V 12V

0V0V

4434 S2 S3+t

41

4442

31

3432

RV1RV2

4-20mATrim

DC i/pTrim J9

K3

K4

J144232+t4-20mA

0V120V0 - 0 -

21VAN2AN10V 12V0V0V S2 00 S3 00

© FAIRFORD ELECTRONICS LtdPCB8200X6

J10

34 31 44 41

32 31 42 41 00 00

TerminalMarkings

Function Description

0VAN1

AnalogueOutput 1

A voltage (range 0-10V) represents the analogue value of aselected parameter. (Advanced user facility)

0VAN2

AnalogueOutput 2

A voltage (range 0-10V) represents the analogue value of aselected parameter. (Advanced user facility)

0-120V0-21V

DC Input Input for either 0-21V or 0-120V with analogue trimming pot.Can be mapped to a selected parameter. (Advanced user facility)

0V Zero volts Common 0V terminal for DC input and Voltage Output.

0V12V

Voltage Output A voltage source (12V, 100mA max.) for use with either the4-20mA input or the DC input. (Advanced user facility)

0V4-20mA

4-20mAInput

Input for an external electronic device with analogue trimmingpot.Can be mapped to a selected parameter. (Advanced user facility)

ThermistorInput

Two-wire input for a PTC motor thermistor.P42 indicates the relative value.

323431

ProgrammableOutputRelay K3

Relay K3 Default function - AlarmChangeover contacts that can be mapped from a selectedparameter. (Advanced user facility)

424441

ProgrammableOutputRelay K4

Default function - Overload IntegratorChangeover contacts that can be mapped from a selectedparameter. (Advanced user facility)

S200

ProgrammableInput 2

Control Input 2Can be mapped to a selected parameter. (Advanced user facility)

S300

ProgrammableInput 3

Control Input 3Can be mapped to a selected parameter. (Advanced user facility)

Figure 2.5.4: Auxiliary Function Card Electrical Connections

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2.6 Supply Connections

2.6.1 Electrical Supply

Power terminals 1 L1, 3 L2, 5 L3 on all units may be connected to a balanced3-phase, 3-wire AC supply that is within the limits specified below.

QFE Nominal Supply Voltage Range

Rated Operational Voltage (Ue)230V/460V 230 -15% 460 + 10%

Rated Frequency (Hz) 50/60 +/- 2Hz

QFE-E Nominal Supply Voltage Range

Rated Operational Voltage (Ue)500V/690V 500 -15% 690 + 10%

Rated Frequency (Hz) 50/60 +/- 2Hz

Phase sequence:

The QFE will operate with any 3-phase rotation sequence. It is important however, to ensure thatthe correct connections are made when used with a rotation sensitive load

2.6.2 Motor Connections

The motor connects to terminals 2 T1, 4 T2, 6 T3. All QFE and QFEplus units will control anystandard 3-phase squirrel-cage induction motor capable of operating satisfactorily whenconnected to the main supply with its normal load coupled.

2.6.3 Control SupplyAll units require a separate 2-wire, single-phase supply connected to terminals X1 and X2. Atthe Control Voltage Selector Switch, the user can select either 115V or 230V. The diagrams insection 2.5 show the location of the terminals X1 and X2 for each model of QFE or QFEplus.

Supply voltage must be in the range 115V (-15%, +10%) or 230V (-15%, +10%).

Note: 1. The control supply requires external fuse protection.

2. Ensure that the control voltage selector switch is set for the control supply voltagethat you intend to apply to the unit before applying power.

Chassis size Current rating Nominal Power Consumption 115V fuse 230V fuse

up to 23A 8VA 125mA 63mA

30A & 44A 10VA 200mA 100mA

Size 1

59A to 146A 12VA 200mA 100mA

Size 2 174A to370A

18VA 200mA 100mA

Size 3 500A to900A

control card 8VA

separate fan supply 140VA

125mA

2A

63mA

1A

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2.7 Control Card ConnectionsAll the control inputs and outputs are on the Electronic Control Card (ELC), mountedwithin the unit. Diagrams in section 2.5 show the location of the electronic controlcard.

2.7.1 Control Inputs QFE and QFEplus

Identification Description

nc th/sw Thermal switch input (2 terminals).The internal thermal switch connections to monitor the unit heatsinktemperature. (For use by the manufacturer only.)

Start/Stop12/24V DC

or115/230V AC

Programmable Input, Control Input 1. (S1, S0)Application of a voltage between S1 and S0 will either SET (normal logicsense) or CLEAR (inverted logic sense) the parameter mapped to byparameter P65.

Removal of this voltage will either CLEAR (normal logic sense) or SET(inverted logic sense) the parameter mapped to by parameter P65

The default setting is P52, Bit 4: Start/Stop, which is active only when theoperator selects and enters REMOTE STARTING at the keypad. Theapplication of a voltage, as specified, between these terminals, will initiate aSTART.The removal of this voltage will initiate a STOP.

2.7.2 Auxiliary function Card Inputs — QFEplusAdditional inputs available on the Auxiliary Function Card (AFC) fitted within the unit.

Identification Description

0-21Vor

0-120V

with 0V

Programmable Input, DC Input.The voltage applied between either 0-21V or 0-120V, but not both, and theadjacent 0V return connection (common with 0-12V output), maps to theparameter selected by P47.Can be used for monitoring and selecting set points.Input can also be used for the control of static loads.Default setting, 0: no parameter selected.

S2, 00 Programmable Input, Control Input 2.Operation is the same as Control input 1 (S0, S1 on the main control card)Sets or clears the parameter mapped to by parameter P67Default setting, None

S3, 00 Programmable Input, Control Input 3.Operation is the same as Control input 1 (S0, S1 on the main control card)Sets or clears the parameter mapped to by parameter P69Default setting, P52, Bit 6: Parameter Group Selector

+t Thermistor Input (2 terminals). For the connection of a standard PTC motorthermistor to BS4999 or IEC 34-11. (When unused, insert a shorting linkbetween these two terminals.)

4-20mA,0V

Programmable Input, 4-20mA Input.The signal maps to the parameter selected by P45. Can be used formonitoring and selecting set points. Input can also be used for the control ofstatic loads.Default setting, 0: no parameter selected.

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2.7.3 Control Outputs — QFE and QFEplusAdditional inputs available on the Auxiliary Function Card (AFC) fitted within the unit.

Identification Description

22, 24, 21 Programmable Output, Relay K1.A Bit = 1 on the parameter/bit selected by P57 makes Relay K1 ACTIVE(normal logic sense) or INACTIVE (inverted logic sense).Default setting, P52, Bit 5: Main Contactor

Relay change-over contacts: Contact rating:: 230VAC, 3A AC1121 - Common. 22 - Normally-closed. 24 - Normally-open

12, 14, 11 Programmable Output, Relay K2.A Bit = 1 on the parameter/bit selected by P59 makes Relay K2 ACTIVE(normal logic sense) or INACTIVE (inverted logic sense).Default setting, P8, Bit 3: Top of Ramp or Full Volts

Relay change-over contacts: Contact rating:: 230VAC, 3A AC1111 - Common. 12 - Normally-closed. 14 - Normally-open

2.7.4 Auxiliary function card Outputs— QFEplusThe Auxiliary Function Card (AFC) mounts within the unit on the QFEplus.The diagrams in section 2.5 show the location of the auxiliary function card.

Identification Description

0V, AN1 Programmable Output, DAC OUTPUT 1.Analogue output. A signal that represents the analogue value of theparameter mapped from P49.Voltage range: 0V to 10V. Maximum current: 10mA

0V, AN2 Programmable Output, DAC OUTPUT 2.Analogue output. A signal that represents the analogue value of theparameter mapped from P50.Voltage range: 0 - 10V. Maximum current: 10mA

0V, 12V A voltage source for use with either the 4-20mA or the 0-21V input.Maximum current output: 100mA

32, 34, 31 Programmable Output, Relay K3.A Bit = 1 on the parameter/bit selected by P61 makes Relay K3 ACTIVE(normal logic sense) or INACTIVE (inverted logic sense).Default setting, P9, Bit 0: Alarm

Relay change-over contacts: Contact rating:: 230VAC, 3A AC1131 - Common. 32 - Normally-closed. 34 - Normally-open

42, 44, 41 Programmable Output, Relay K4.A Bit = 1 on the parameter/bit selected by P63 makes Relay K4 ACTIVE(normal logic sense) or INACTIVE (inverted logic sense).Default setting, P9, Bit 1: Overload Integrating

Relay change-over contacts: Contact rating:: 230VAC, 3A AC1141 - Common. 42 - Normally-closed. 44 - Normally-open.

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2.9 Typical Load Power Rating for QFE Units

QFEModelNumber

Powerrating at230V

Powerrating at400V

Powerrating at460V

QFE-EModelNumber

Powerrating at575V

Powerrating at690V

9 2.2 4 4 9 5.5 7.5

16 3.7 7.5 7.5 16 11 15

23 6.3 11 11 23 15 22

30 7.5 15 15 30 18.5 30

44 11 22 22 44 30 37

59 16 30 32 59 37 55

72 20 37 40 72 45 60

85 22 45 45 85 55 75

105 30 55 55 105 75 90

146 45 75 80 146 110 132

174 55 90 110 174 132 160

202 63 110 132 202 150 200

242 75 132 150 242 185 220

300 90 160 185 300 220 300

370 110 200 220 370 250 375

500 160 250 300 500 375 500

600 185 320 375 600 450 600

750 250 400 450 750 560 750

900 300 500 560 900 670 900

Table 2.9 Approx. load power in KW

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2.10 Fuse and Current Ratings

2.10.1 Full-Load, Current Limit and Short-Circuit Protection

QFE and Rated Operational Short-Circuit Protection Device (SCPD)QFEplus

ModelCurrent Ie (Unit FLC) Fuse Type Current Total I2t

ClearingNumber (A rms) (FE Code) Rating (A) at 660V (A2s)

91623

91623

FUSE 32FUSE 32FUSE 33

6363

100

770770

24503044597285

105146

3044597285

105146

FUSE 33FUSE 35FUSE 36FUSE 37FUSE 37FUSE 39FUSE 39

100160200250250400400

24507500

150002850028500

105000105000

174202

174202

FUSE 41FUSE 41

500500

180000180000

242300370

242300370

FUSE 42FUSE 42FUSE 43

500500630

170000170000350000

500600750900

500600750900

FUSE 44FUSE.44FUSE.45FUSE.45

900900

12501250

670000670000

19500001950000

ALLCurrent Limit (range of setting from keypad, user selected)

Minimum: 100% Unit FLCMaximum: 800% Unit FLC

Note: The fuses for QFE models 9 to 146 (Size 1) must be fitted externally to the unit.For QFE models 174 to 370 (Size 2) and 500 to 900 (Size 3), the recommended fusesmay be fitted internally, in place of the removable links.

2.10.2 External Fuse RequirementsThe rating of fuse protection for the motor circuit should be at least twice the ratedcurrent of the motor. When high inertia loads (e.g. fans) are being started, specialconsideration should be given to fuse ratings due to the extended ramping times.

For semiconductor protection fusing, refer to the table in section 2.10.1 above.

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2.10.3 Overload Current Profile and Duty Cycle AC-53a

IEC 947-4-2 Motor Utilisation Category: AC-53a ( not operating in bypassmode)

To calculate times for a lower value of current, divide the square of the next highest givencurrent multiplied by it’s given time by the square of the required current.

For example, to find the time, Tx , for X=2.5 x Ie , then Tx = (32 x 35)/(2.52) = 50 seconds.

EXAMPLE IEC RATING INDEX

3 - 35 : 99 - 10:AC53a:30A

Rated Operational current (Ie)

Utilisation Category

For a 99% on-load factor,and 10 standard operatingcycles per hour, the unit canaccommodate 3 x Ie for 35seconds.

-9-16-23-30-44-59

-72-85

— ———

99 10353

— ———

99 1045

-105-146-174-202

— ———

99 10353

99 1064

— ———

-242-300-370-500-600-750-900

— ———

60 3353

60 364

— ———

The models of QFE and QFEplus shown will meet the categoryAC-53a overload current profiles specified.

Ratio ofOn-load period

to total load(F, %)

Number ofoperating

cycles per hour(S)

Duration ofOverload

(Tx,

seconds)

OverloadCurrent

(X, multipleof Ie)

QFE andQFEplus Model

Numbers

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2.10.4 Overload Current Profile AC-53B

IEC 947-4-2 Motor Utilisation Category: AC-53b ( operating in bypass mode)

-9-16-23-30-44-59-72

-85

— ——

4 1205

— ——

35 1203

-105-146-174-202

6 1204

— ——

— ——

35 1203

-242-300-370-500-600-750-900

EXAMPLE IEC RATING INDEX

5 - 4 : 120:AC53b:30A

Rated Operational current(Ie) for starting duty only

UtilisationCategory

The unit can accommodate5 x Ie for 4 seconds, butrequires 120 seconds beforeinitiating any subsequentstart.

6 3604

— ——

— ——

35 3603

The models of QFE and QFEplus shown will meet the categoryAC-53b overload current profiles specified.

Duration of Overload(Tx, seconds)

Unit Off Time(OFF-time, seconds)

Overload Current(X, multiple of Ie)

QFE andQFEplus Model

Numbers

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2.10.5 Overcurrent Trip Graph

Note: This formula applies to motors that have current ratings less than the unit currentrating

(adjustable by P34 (or P93) ‡; default setting: 110%)

P35 (or P94) ‡

Overload Delay

‡ Parameter selected through either the primary or secondary group of value parameters.

Setting for the OverloadLevel (P34 or P93) = x 120%

Motor Current Rating

Unit Current Rating(parameters P24, P25)

Fault current ( Motor Current x N ) 1 10 2 3 4 5 6 7 8 9

0.01

0.1

1

10

100

1000

Secondsto trip

DefaultDelay = 140

Overload start point

Delay = 80

Delay = 30

Delay = 10