POWER CIRCUITS
710-03261-00A 14 MVS SERIES
Section 5 Power Circuits
5.1 Overview
MVS 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 capacitor contactor
• line inductors
• transient / overvoltage protection
• medium voltage control supply transformer
Please refer to the schematic drawings on pages 12, 13, 15 and 17 for details.
5.2 Main Contactor
A main contactor is required in all MVS Series installations. The contactor should
be selected such that the contactor's AC3 rating is 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 input side of the
soft starter and the coil is associated with output terminals 13, 14 of the MVS (refer
to Diagram 3).
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 2).
5.3 Bypass Contactor
A bypass contactor is required in all MVS Series installations. The contactor should
be selected such that the contactor's AC1 rating is greater than or equal to the full
load current rating of the connected motor.
The bypass contactor is associated with bypass terminals T1B, T2B, T3B on the
starter. The coil is associated with output terminals 23, 24, and the auxiliary
Normally Open contact is associated with input terminals C73, C74 of the MVS
(refer to Diagram 3).
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 2).
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