INSTALLATION: POWER CIRCUITS
MVS Series
15
710-03261-00D
Power Circuits
5
5.1 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. The following additional components may also be required:
•
main isolator/ earth switch
•
R Rated protection fuses
•
power factor correction
•
line inductors
•
transient/ overvoltage protection
•
control supply transformer
5.2 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.
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
Diagram 1: Standard Power Circuit Configuration
on page 16).
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
Diagram 4: Internal Wiring
on page 21).
5.3 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.
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
Diagram 1:
Standard Power Circuit Configuration
on page 16).
To ensure that the potentially dangerous medium voltage area is isolated from the
low voltage control area, power is supplied to the bypass contactor coil from the
control voltage terminal block (refer to
Diagram 4: Internal Wiring
on page 21).
Chapter 5
