Motor Connections (Supplement To Ach550-Uh User's Manual) - ABB ACH550 User Manual

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Motor Connections (Supplement to ACH550-UH User's Manual)

Motor Terminals
See "Drive's Power Connection Terminals" above.
Bypass Contactors
The bypass circuit available with the ACH550 E-Bypass includes two contactors.
One contactor is the bypass contactor (2M) that can be used to manually connect
the motor directly to the incoming power line in the event that the ACH550 is out of
service. The other contactor is the ACH550 output contactor (1M) that disconnects
the ACH550 from the motor when the motor is operating in the Bypass mode. The
drive output contactor and the bypass contactor are interlocked to prevent "back
feeding," applying line voltage to the ACH550 output terminals.
Motor Overload Protection
In the Drive mode, motor overload protection is provided by the ACH550.
In the Bypass mode, motor overload protection is provided by the bypass control
board.
WARNING: If power is applied and the switches and contacts in the control
circuit are commanding the motor to run, the motor will start as soon as the
overload protection is reset.
Use caution when resetting the overload protection to make sure it is safe to
start the motor.
Technical Data
E-Bypass Configurations for ACH550 Drives