System Design
Soft Starter Management Software
PC software can provide real-time or offline management of soft starters.
• For real-time management in a network of up to 254 starters, the software must
connect to the soft starter via a Modbus TCP or Modbus RTU card. The software
can monitor, control and program the starter across the network.
• The software can be used to program the starter via the USB port on the pumping
smart card.
• For offline management, a configuration file generated in the software can be
loaded into the starter via the USB port.
3.8 Main contactor or circuit breaker
A main contactor or circuit breaker should be installed with the soft starter.
• A main contactor is recommended to protect the soft starter from voltage
disturbances on the network, while stopped. Select a contactor with an AC3 rating
greater than or equal to the full load current rating of the connected motor.
• Use a shunt trip circuit breaker 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.
Use the main contactor output (33, 34) to control the main contactor.
3.9 Power Factor Correction
If power factor correction is used, a dedicated contactor should be used to switch in the
capacitors.
To use the soft starter to control power factor correction, connect the PFC contactor to a
programmable relay set to Run. When the motor reaches full speed, the relay will close and
power factor correction will be switched in. Do not use the soft starter relay output to
directly switch in power factor correction.
Programmable output (set = Run)
Power factor correction contactor
CAUTION
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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