INSTALLATION
6.14
Power Circuits
Overview
MVS soft starters are designed to operate as part of a system including other components. A main contactor and
bypass contactor are required in all installations. MVS models V02 ~ V07 must be installed with fuses. MVS model
V13 must be installed with either contactor and fuses or a circuit breaker.
The following additional components may also be required:
main isolator/ earth switch
power factor correction
line inductors
transient/ overvoltage protection
MV/LV control supply transformer
Main Contactor
The MVS must always be installed with a main contactor. Select a contactor with an AC3 rating greater than or
equal to the full load current rating of the connected motor or there is an option for a circuit breaker above 7.2 kV.
The main contactor is associated with terminals L1, L2, L3 on the supply side of the soft starter. The coil is
associated with output terminals 13, 14 of the MVS (refer to
Power Circuit Configuration (models V02 ~ V07) on
page 32).
To ensure that the potentially dangerous medium voltage area is isolated from the low voltage control area, power
is supplied to the main contactor coil from the control voltage terminal block (refer to
Internal Wiring –X10 on
page 36).
Bypass Contactor
The MVS must always be installed with a bypass contactor. Select a contactor with an AC1 rating greater than or
equal to the full load current rating of the connected motor or there is an option for a circuit breaker above 7.2 kV.
The bypass contactor is associated with terminals L1, L2, L3 on the supply side of the soft starter, and bypass
terminals T1B, T2B, T3B on the motor side. The coil is associated with output terminals 23, 24, and the auxiliary
Normally Open contact is associated with input terminals C73, C74 of the soft starter (refer to
Power Circuit
Configuration (models V02 ~ V07) on page 32).
To ensure that the potentially dangerous medium voltage area is isolated from the low voltage control area, power
is supplied to the bypass relay coil from the control voltage terminal block (refer to
Internal Wiring –X10 on page
36).
710-13937-00C
MVS Panel User Manual
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