INSTALLATION
MVE User Manual (710-17074-00G) |
23
6.12
Power Circuits
Overview
MVE soft starters are designed to operate as part of a system including other components. A bypass contactor or circuit breaker is
required in all installations. MVE can also be installed with a main contactor. In this case, MVE must be installed with fuses.
Additional components may also be required to comply with soft starter panel specifications.
Main Switching Device
The MVE can be installed with a main contactor or a circuit breaker.
•
Select a contactor with an AC3 rating greater than or equal to the full load current rating of the connected motor.
•
Select a circuit breaker greater than or equal to the full load current rating of the connected motor.
The main switching device 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 MV-DS (refer to
Power Circuit Configuration
on page
To ensure that the potentially dangerous medium voltage area is isolated from the low voltage control area, power is supplied to
the main switching device coil from the control voltage terminal block (refer to
Internal Panel Wiring
on page 27).
Bypass Switching Device
The MVE must always be installed with a bypass contactor or circuit breaker.
•
Select a contactor with an AC1 rating greater than or equal to the full load current rating of the connected motor.
•
Select a circuit breaker greater than or equal to the full load current rating of the connected motor.
The bypass switching device 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
on page 24).
To ensure that the potentially dangerous medium voltage area is isolated from the low voltage control area, power is supplied to
the bypass switching device coil from the control voltage terminal block (refer to
Internal Panel Wiring
on page 27).
R Rated Protection Fuses
If the MVE is installed with a main contactor, R Rated protection fuses must be installed on the supply side of the soft starter to
provide Type 1 coordination and short circuit protection for the motor branch circuit. Select the appropriate fuse based on the
motor's rated full load current.
Power Factor Correction
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
Incorrect installation
19108.
A
Power factor correction capacitors should be selected based on the motor data and the required final power factor. Select a
contactor according to the required kVAr.
Power factor correction capacitors must be connected to the supply side of the soft starter.
Correct installation
19122.
A
The soft starter must control the power factor correction capacitor contactor. Use the run output (terminals 33, 34 on the power
interface board).
