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INSTALLATION
This robust stack assembly will operate in an ambient temperature of up to 45°C when naturally cooled and has a built in
90°C over temperature trip on the heatsink as a safety feature. The unit should be mounted vertically, with heatsink fins
top to bottom and with sufficient surrounding air space to maximise natural convection cooling. If the unit is mounted in an
enclosure or cabinet, adequate ventilation and/or forced air-cooling should be fitted.
Load considerations
The PR3E series of power controllers are designed for 3-wire, 3-phase floating-star or closed delta, resistive loads. The
PR3-E series are 2-leg thyristor controllers and therefore do not support 3-phase, 4-wire star, star point to neutral loads.
For further information on configured loads, see the ‘Application Circuits’ section of our supporting datasheet – APC (ref.
X10322).
Heating loads such as Molybdenum, Platinum or Tungsten have a typical, 10:1, hot to cold, resistance ratio and therefore,
when cold, draw larger currents than normal, it is recommended to enable the soft start feature when driving these types
of load.
Connections
This unit has simple clamp type connectors for all auxiliary-wiring requirements.
Power Supply
Three way internal jumper JP2 selects the internal power supply input voltage to either 420v or 460v ac rms, phase to
phase. If the jumper link is fitted across HI-COM, 460v is selected with the jumper link fitted across COM-LO, 420v is
selected. The jumper header is labelled as shown below:
COM
HI
LO
The SPM model has an internal power supply, the units are factory set for 420v rms (COM-LO) supply. For operation with
an external power supply the jumper link should be removed from JP2.
Fusing
It is recommended that high speed semiconductor type fuses (as supplied on SPM models) be used for protection. See
SRA Data sheet X10255 for further information. Other external supplies should be fused accordingly.
CE Marking
This famil
y carries a “CE” marking. These burst fire controllers do not normally require a remote filter. For more
information contact our sales desk. A Declaration of Conformity is available on request.
SPECIFICATIONS
Power (Current) ratings:
30kW (42A); 36kW (50A); @ a typical supply of 415V RMS
Input voltage:
400V RMS +/- 10%
Frequency:
50/60Hz
Control Signal Input Options:
0 to 5V or Manual using 5K Potentiometer: SW1-3:OFF, SW1-5:OFF, SW1-6:OFF.
1 to 5V: SW1-3:ON, SW1-5:OFF, SW1-6:OFF. 0 to 10V: SW1-3:OFF, SW1-5:OFF,SW1-
6:ON
2 to 10V: SW1-3:ON, SW1-5:OFF, SW1-6:ON
0-20mA: SW1-3:OFF, SW1-5:ON, SW1-6:OFF. 4-20mA: SW1-3:ON, SW1-5:ON, SW1-
6:OFF.
Alarms Relay Contact Rating:
2A @ 125V ac Max.
Power Indicator:
Power
LED
Status Indicator:
Status LED indicator changes intensity during phase angle soft start or flashes in
synchronisation with bursts.
Over Temperature:
Temperature trip activates @ 90ºC, +/- 1ºC. Fault LED indicator flashes,
continuous fast
pulsing.
Temperature trip de-activates @ 85ºC, +/- 1ºC
Alarm Relay Default State
SW1-4
:
OFF Relay is energised in no fault state, NO contact is closed (connected to
COM).
SW1-4
:
ON Relay is de-energised in no fault state, NO contact is open (disconnected from
COM).
SW1 Pos 4
= ON - Relay is de-
Phase
Phase loss Detection
Fault LED indicator 'flashes' continuous slow pulsing.
Sensor Loss Detection:
Fault LED indicator ‘flashes’
fast pulsing.
SCR/Fuse Fault:
Fault LED and Status LED
alternately flash (SPM model only).
Cable Terminations:
Phase Power
10mm² rising clamp terminal block
Earth
10mm² rising clamp terminal block
Remote Supply, Alarm Relay, Enable, Control Signal 2.5mm² rising clamp terminal block
Terminal Torque Settings:
1.2Nm (10mm²) Power terminals only.
Fusing
30kW: 56ET (56A) High-Speed Semiconductor type fuse, or equivalent.
36kW:
63ET (63A) High-Speed Semiconductor type fuse, or equivalent.
Ambient Temperature:
45
C without de-rating
Dimensions:
152mm (D) x 241mm (W) x 115mm (H)
Fixing Centres:
4 x 5.5mm ø holes on centres 220mm (W) x 130mm (D)
Weight:
2.6kg Maximum (all models)
