Quick Start
Commissioning
30 Digistart IS User Guide
www.controltechniques.com Issue: 4
Supply Voltage
(< 440 Vac)
Supply Voltage
(< 575 Vac)
Supply Voltage
(< 690 Vac)
4.4.2 Control supply fuses
The following table lists the recommended control supply fuses. It is recommended that you use slow blow fuses which allow a 10A,
0.01 second surge.
4.5 Bypass contactor
Some Digistart IS soft starters are internally bypassed and do not require an external bypass contactor.
Non-bypassed soft starters may be installed with an external bypass contactor. Select a contactor with an AC1 rating greater than or
equal to the full load current rating of the connected motor.
Internally bypassed models:
IS1x0023B, IS1x0043B, IS1x0053B, IS1x0076B, IS1x0097B, IS1x0105B, IS2x0145B, IS2x0170B, IS2x0200B, IS2x0220B,
IS3x0255B, IS4x0350B, IS4x0425B, IS4x0500B, IS4x0700B, IS4x0820B, IS4x0920B, IS4x1000B
Non-bypassed models:
IS3x0255N, IS4x0360N, IS4x0430N, IS4x0650N, IS4x0790N, IS4x0930N, IS561200N, IS561410N, IS561600N
4.6 Main contactor
A main contactor must be installed if the Digistart IS is connected to the motor in inside delta format and is optional for in-line
connection. Select a contactor with an AC3 rating greater than or equal to the full load current rating of the connected motor.
4.7 Circuit breaker
A shunt trip circuit breaker may be used instead of a main contactor to isolate the motor circuit in the event of a soft starter trip. The
shunt trip mechanism must be powered from the supply side of the circuit breaker or from a separate control supply.
4.8 Power factor correction
If power factor correction is used, a dedicated contactor should be used to switch in the capacitors.
Power factor correction capacitors must be connected to the input side of the soft starter. Connecting power factor
correction capacitors to the output side will damage the soft starter.
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