Implementing A Bypass Connection; Example Bypass Connection - ABB ACS880-07 Hardware Manual

Implementing a bypass connection

If bypassing is required, employ mechanically or electrically interlocked contactors
between the motor and the drive and between the motor and the power line. Make sure
with interlocking that the contactors cannot be closed simultaneously.
WARNING! Never connect the drive output to the electrical power network. The
connection may damage the drive.

Example bypass connection


An example bypass connection is shown below.
Q1 Drive main switch
Q4 Bypass circuit breaker
K1 Drive main contactor
K4 Bypass contactor
K5 Drive output contactor
Guidelines for planning the electrical installation 83
S11 Drive main contactor on/off control
S40 Motor power supply selection (drive or direct-on-
line)
S41 Start when motor is connected direct-on-line
S42 Stop when motor is connected direct-on-line
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