fd8413 issue01 qfe electrical installation electrical installation installation qfe 1 2. electrical...
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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
Installation
QFE
2
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.
Installation
QFE
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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.
Installation
QFE
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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
Installation
QFE
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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
Installation
6
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
Installation
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.)
Installation
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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
Installation
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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.
Installation
QFE
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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
Installation
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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
Installation
QFE
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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
Installation
QFE
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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
Installation
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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.
Installation
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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.
Installation
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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
Installation
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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.
Installation
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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
Installation
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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
Installation
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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