General specification
General Standards 
The product is designed and produced to comply with BS EN60947-4-3 (Low
voltage switch gear and control gear). Other applicable standards are cited
where appropriate.
Installation Categories 
General installation category details for the driver and power units are
summarised in the table below.
Installation Rated impulse Rated 
Category withstand insulation
voltage (Uimp) voltage
Communications II 0.5kV 50V
Standard/Optional I/O II 0.5kV 50V
Driver module power II 2.5kV 230V
Relays III 4kV 230V
Power Modules (up to 600V) III 6kV 600V
Power Modules (690V) II 6kV 690V
Auxiliary (fan) supply II 2.5kV 230V
Power (at 40°C) 
Caution
Although the driver module supply voltage range is 85 to 265V ac, the
fans (if any) fitted to the power (thyristor) modules are specified for use
at one of 115V ac or 230V ac as specified at time of order. Before
plugging the fan harness into the driver module, ensure that the utility
supply voltage is suitable for the fan(s). Otherwise, fan life may be
shortened or the cooling effect may not be sufficient, either case
presenting a possible hazard to the equipment or to the operator.
Driver module
Voltage range:  100 to 240V ac (+10% - 15%)
Frequency range:  47 to 63Hz
Power requirement:  60W + Power Module fans 
(15W each for 400A/500A/630A power 
modules; 
10W each for 160A/250A modules)
Power module
Number of modules:  Up to four identical units per driver unit
Voltage range:  100 to 600V ac (+10% - 15%) or 
100 to 690V ac (+10% - 15%) 
as specified at time of order
Frequency range:  47 to 63Hz
Nominal current:  16 to 630A  depending on power module
Power dissipation:  1.3W per Amp per phase
Cooling
Up to and including 100A:  Natural convection
Above 100A:  Fan cooling. Fans are connected in parallel 
to driver module connector
Fan supply voltage:  115 or 230V ac, as specified at time of order
(see ‘Caution’ above)
Protection Thyristor drive:  RC circuits and high-speed fuses (Type 1)
Pollution degree: Pollution degree 2 (EN60947-1)
Rated short circuit 
conditional current: 92kA
Utilisation categories AC51: non inductive or slightly inductive loads, 
resistance furnaces
AC56a: switching of transformers
Duty cycle: Uninterrupted duty/continuous operation
Form designation: Form 4
Short circuit protection
co-ordination type: Type1
Load types:  Single or multiphase control of resistive 
loads (low/high temperature coefficient and
non-aging/aging types) and transformer 
primaries. Load voltage/current feedback 
either internal (standard) or external 
(option for use with transformer 
secondaries for example)
Physical 
Dimensions and fixing centres  See Fixing Details
Weight kg (lbs): 
(including 2kg for driver module)
Current 1 phase 2 phases 3 phases 4 phases
50A 6.5 (14.3) 11.0 (24.3) 15.5 (34.2) 20.0 (44.1)
100A 6.5 (14.3) 11.0 (24.3) 15.5 (34.2) 20.0 (44.1)
160A 6.9 (15.2) 11.8 (26.0) 16.7 (36.8) 21.6 (47.6)
250A 7.8 (17.2) 13.6 (30.0) 19.4 (42.8) 25.2 (55.6)
400A 11.8 (26.0) 21.6 (47.6) 31.4 (69.2) 41.2 (90.8)
500A 14.0 (30.9) 26.0 (57.3) 38.0 (83.8) 50.0 (110.2)
630A 14.5 (32.0) 27.0 (59.5) 39.5 (87.1) 52.0 (114.6)
Environment 
Temperature limits Operating:  0°C to 50°C (derate above 40°C as per 
accompanying curves)
Storage:  -25°C to 70°C
Atmosphere:  Non-explosive, non-corrosive and 
non-conductive
Humidity limits:  5% to 95% RH (non-condensing)
Altitude (maximum):  1000 metres
Protection: IP10 (EN60529)
External wiring:  Must comply with IEC 364
Shock (EN60068-2-29): 10g Pk; 6mS duration; 10 bumps
Vibration (EN60068-2-6):  67-150Hz at 1g
EMC 
Standard:  EN60947-4-3 Emissions class A
This product has been designed for 
environment A (Industrial). Use of this  
product in environment B (domestic, 
commercial and light industrial) may cause  
unwanted electromagnetic disturbances in 
which cases the user may be required to take 
adequate mitigation measures.
Immunity criteria: Immunity criterion 1 (criterion 3 for voltage 
dips and short-time interruptions)
Operator Interface 
Display:  4 lines of up to 10 characters each. Display 
pages can be used to view process variable 
values and to view and edit the 
configuration of the unit. (Editing of the 
configuration is better carried out using 
configuration software (iTools). In addition 
to the standard displays, up to four ‘custom’
pages can be defined which allow bargraph 
displays, text entry etc.
Character format:  7 high x 5 wide yellow-green LCD dot matrix 
array
Push buttons: 4 push buttons provide page and item entry
and scroll facilities
LED indicators (beacons):  3 indicators (PWR LOC and ALM) are 
supplied to indicate that power is applied, 
that Local Control  is selected and that 
there is one or more active alarm 
respectively
Standard Inputs/Outputs (SK1) 
All figures are with respect to driver module 0V, unless otherwise stated.
Number of inputs/outputs
No of analogue inputs: 2
No of analogue outputs: 1
No of digital inputs/outputs: 2 (each configurable as an input or an 
output)
10V (Potentiometer) supply: 1
Update rate:  Twice the mains frequency applied to power
module 1. Defaults to 83.2Hz (12mS) if no 
power applied to power module1 or if the 
frequency lies outside the range 47 to 63Hz)
Termination:  Removable 10-way connector. (5.08 mm. 
pitch)
Analogue Inputs 
Performance: See Tables 1 and 2
Input types: Each input is configurable as one of: 0 to 
10V, 1 to 5V, 2 to 10V, 0 to 5V, 0 to 20mA,    
4 to 20 mA
Absolute maxima + terminal: ±16V or ±40mA
- terminal: ±1.5V or ±300mA
500
400
300
200
100
0

100 Amp unit
50 Amp unit
Temperature °C
Maximum current (A)
600
160 Amp unit
250 Amp unit
400 Amp unit
500 Amp unit
630 Amp unit

Analogue input: Voltage input performance
Parameter Typical Max/Min
Total voltage working input span (Note 1) -0.25V to +12.5V
Resolution (noise free) (Note 2) 13 bits
Calibration error (Notes 3 and 4) <0.25% <0.5%
Linearity error (Note 3) ±0.1%
Ambient temperature error (Note 3) <0.01%/°C
Input resistance (+‘ve terminal to 0V) >140kΩ
Input resistance (-‘ve terminal to 0V) 150Ω
Allowable voltage (-‘ve terminal to 0V) ±1V
Series mode rejection of mains interference 46dB >30dB
Common mode dc rejection 46dB >40dB
Hardware response time 5ms  
Note 1: w.r.t. to the relevant -‘ve input
Note 2: w.r.t. total working span
Note 3: % of effective range (0 to 5V, 0 to 10V)
Note 4: After warm up. Ambient = 25°C
Table 1  Analogue input specification table (voltage inputs)
Analogue input: Current input performance
Parameter Typical Max/Min
Total current working input span -1mA to +25mA
Resolution (noise free) (Note 1) 12 bits
Calibration error (Notes 2 and 3) <0.25% <0.5%
Linearity error (Note 2) ±0.1%
Ambient temperature error (Note 2) <0.01%/°C
Input resistance (+‘ve to -’ve terminal) 235Ω
Input resistance (-‘ve terminal to 0V) 150Ω
Allowable voltage (-‘ve terminal to 0V) <±1V
Series mode rejection of mains interference 46dB >30dB
Common mode dc rejection 46dB >40dB
Hardware response time 5ms
Note 1: w.r.t. total working span
Note 2: % of effective range (0 to 20mA)
Note 3:  After warm up. Ambient =25°C
Table 2  Analogue input specification table (current inputs)
Analogue outputs 
Performance: See Tables 3 and 4
Output types: Each output is configurable as one of 0 to 
10V, 1 to 5V, 2 to 10V, 0 to 5V, 0 to 20mA,  
4 to 20 mA
Absolute maxima + terminal: (-0.7V or -300mA) or (+16V or +40mA)
0V terminal: ±2A
Analogue output: Voltage output performance
Parameter Typical Max/Min
Total voltage working span -0.5V to +12.5V
(within ±20mA (typ.) current span)
Short circuit current <24mA
Resolution (noise free) (Note 1) 12.5 bits
Calibration error (Notes 2 and 3) <0.25% <0.5%
Linearity error (Note 2) <±0.1%
Ambient temperature error (Note 2) <0.01%°C
Minimum load resistance >800Ω
DC output impedance <2Ω
Hardware response time (10% to 90%) 20ms <25ms
Note 1: w.r.t. total working span
Note 2: % of effective range (0 to 5V, 0 to 10V)
Note 3: After warm up. Ambient = 25°C 
Table 3  Analogue output specification table (voltage outputs)
Analogue output: Current output performance
Parameter Typical Max/Min
Total current working span -24mA to +24mA
(within -0.3V to +12.5V voltage span)
Open circuit voltage <16V
Resolution (noise free) (Note 1) 12.5 bits
Calibration error (Notes 2 and 3) <0.25% <0.5%
Linearity error (Note 2) <±0.1%
Ambient temperature error (Note 2) <0.01%°C
Maximum load resistance <550Ω
DC Output conductance <1μA/V
Hardware response time (10% to 90%) 20ms <25ms
Note 1: w.r.t. total working span
Note 2: % of effective range (0 to 20mA)
Note 3: After warm up. Ambient = 25°C 
Table 4  Analogue output specification table (current outputs)
10V supply (Potentiometer supply)
Output voltage: 10.0V ± 0.3V @ 5.5mA
Short circuit o/p current: 15mA max.
Ambient temperature drift: ± 0.012%/°C (typ); ±0.04%/°C (max.)
Absolute maxima  Pin 1: (-0.7V or -300mA) or (+16V or +40mA)
Digital I/O
Hardware response time: 100μs
Voltage inputs 
Active level (high): 4.4V<Vin<30V
Non-active level (low): -30V<Vin<+2.3V
Input impedance: 10kΩ
Contact closure input 
Source current: 10mA min; 15mA max
Open contact 
(non active) resistance:  >500Ω
Closed contact 
(active) resistance:  <150Ω
Current source output 
Source current: 9mA<Isource<14mA @ 14V
10mA<Isource<15mA @ 0V
9mA<Isource<14mA @ -15V
Open circuit voltage: <14V
Internal pull-down resistance: 10kΩ (to 0V)
Absolute maxima + terminal: ±30V or ±25mA
- terminal: ±2A
Notes:
1. Absolute maximum ratings refer to externally applied signals
2. The 10V potentiometer supply is designed to supply two 5kΩ
potentiometers connected in parallel with one another.
3. The maximum current for any 0V terminal is ±2A.
Relay Specification 
The relays associated with this 
product have gold plated contacts 
applicable to ‘dry circuit’ 
(low current) use.
Contact life Resistive loads: 100,000 operations (de-rate with inductive
loads as per figure)
High power use  Current: <2A (resistive loads)
Voltage: <264V RMS
Low power use  Current: >1mA
Voltage: >1V
Contact configuration:  Single pole change-over (One set of 
Common, Normally Open and Normally 
Closed contacts)
Termination Relay 1 (standard): 3-way connector on underside of driver 
unit 
Watchdog relay (standard): 3-way connector on underside of driver 
unit 
Relays two to four (option): 12-way option module connector
Absolute max switching capability: <2A at 240V RMS (resistive loads)
Note: Normally closed and normally open refer to the relay when the coil
is not energised.
Optional Input/Output Modules (SK3, SK4, SK5)
Up to three input/output modules can be fitted, each containing the inputs
and outputs detailed below. Unless otherwise stated below, the specification
for the optional I/O (including relays) is as given above for the standard I/O.
Termination: Removable 12-way (5.08mm pitch) 
connector per module
Number of modules: Up to 3
Number of inputs: 1 analogue input and 2 digital inputs per 
module
Number of outputs: 1 analogue output per module
Number of relays: 1 set of common, normally open and 
normally closed contacts per module
10V potentiometer supply 
output voltage: 10.0V ±0.3V at 5.5mA
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1 0.8 0.6 0.4 0.2
Reduction factor
Inductive life = resistive life x reduction factor

Mains Network Measurements
All network measurements are calculated over a full mains cycle, but
internally updated every half-cycle. For this reason, power control, current
limits and alarms all run at the mains half-cycle rate. The calculations are
based on network waveform samples, taken at a rate of 20kHz. 
Measurements on each network phase are synchronised to its own phase
and if the line voltage cannot be detected, the measurements will stop for
that phase. It should be noted that, depending on the network
configuration, the phase voltage referred to is one of:
a. the line voltage referenced to neutral in four star,
b. the line voltage referenced to neutral or another phase for single phase 
networks or
c.  the line voltage referenced to the phase applied to the next adjacent 
power module for three phase star or delta networks.
The parameters below are directly derived from measurements for each
phase.
Accuracy (20 to 25°C)
Line frequency (F): ±0.1Hz
Line RMS voltage (Vline): ±0.5% of Nominal Vline
Load RMS voltage (V): ±0.5% of Nominal V for readings
>1% of Nominal V
Thyristor RMS current (IRMS): ±0.5% of Nominal IRMS for current 
readings >3.3% of Nominal IRMS
Unspecified for readings <3.3% of 
Nominal IRMS
Note:  For external current feedback this 
specification does not include errors
associated with external current 
transformers.
Load RMS voltage squared (Vsq): ±1% of (Nominal V)2
Thyristor RMS current squared (Isq): ±1% of (Nominal I)2
True load power (P): ±1% of (Nominal V) x (Nominal I)
Frequency resolution:  0.01Hz
Measurement resolution:  11 bits of Nominal value (noise 
free)
Meas. drift with ambient temp: <0.02% of reading /°C
Further parameters (S, PF, Q, Z, Iavg, IsqBurst, IsqMax, Vavg, Vsq Burst,
VsqMax and PBurst) are derived from the above, for each network 
(if relevant). See EPower User Guide Section 6.19.1 (Meas submenu) for
further details.
External Current Transformer
Ratio:  Chosen such that the full scale 
output from the current transformer
is 5 Amps
Communications
Modbus TCP (Ethernet)  Type: 10baseT (IEEE801)
Protocol: Modbus TCP
Connector: RJ45 with indicators 
(Green = Tx activity; 
Yellow = Network activity)
Modbus RTU  Protocol: Modbus RTU slave
Transmission standard: 3-wire EIA485
Connector: Twin, parallel-wired RJ45, with 
indicators (Green = Tx activity; 
Yellow = Rx activity)
Isolation (EN60947-4-3): Installation category II, Pollution 
degree 2
Terminals to ground: 50V RMS or dc to ground (double 
isolation)
DeviceNet: Protocol: DeviceNet
Connector: 5-way with indicators 
(Network Status and Module Status) 
Profibus: Protocol: Profibus DPV1
Connector: 9-way D type with indicators 
(Operator Mode and Status)
EtherNet/IP: Protocol: EtherNet/IP
Connector: RJ45 with 3 indicators
CC-Link:  Protocol: CC-Link version 1.1
Connector: 5-way with indicators