ACQ550-CC Packaged Drive with Bypass
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Technical Data
Motor Connections
Motor Terminals
See preceding “Power Connection Terminal Data” tables.
Bypass Contactors
The bypass circuit in the ACQ550 Bypass includes two contactors. One contactor is
the bypass contactor (2M) that can be used to connect the motor directly to the
incoming power line in the event that the ACQ550 is out of service. The other
contactor is the ACQ550 output contactor (1M) that disconnects the ACQ550 from
the motor when the motor is operating in the Bypass mode. The drive output
contactor and the bypass contactor are electrically interlocked to prevent “back
feeding,” applying line voltage to the ACQ550 output terminals.
Motor Overload Protection
The ACQ550 with Bypass includes a motor overload relay to provide thermal motor
protection. It is connected in both drive and bypass modes of operation. For motor
full load currents through 80 amperes, the Motor Overload Relay is an adjustable
trip, bimetallic overload relay with a class 20 trip characteristic. Above 80 amperes,
the Motor Overload Relay is an adjustable trip, electronic overload relay with
selectable class 10, 20 or 30 trip characteristic. The class 20 setting on the
electronic overload relays is the appropriate choice for the majority of the motors
used in North America.
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 relay is reset.
Use caution when resetting the overload relay to make sure it is safe to start
the motor.
