176 Rockwell Automation Publication 750-UM006C-EN-P - March 2022
Chapter 6 Troubleshooting
Circuit Breaker
Troubleshooting
The drive has three circuit breakers that are accessible on the front cover. All
three circuit breakers must have power present for the drive to operate and
control a motor and its brake properly.
Open Auxiliary Circuit Breaker Door
1. Follow procedure to Remove Power on page 146.
2. Use a (flathead screwdriver) to rotate the locks counter-clockwise to
open the auxiliary circuit breaker door on the front cover.
3. Switch all circuit breakers (main power 400/480V AC, 24V DC control
power, and mechanical brake or source brake) to the OFF positions.
ATTENTION: To avoid an electric shock hazard, verify that the voltage on the
bus has entirely discharged before servicing.
ATTENTION: The drive contains high-voltage that takes time to discharge
after removal of the main power supply. Before working on the drive, isolate
the main power supply from the line input (L123). Wait 3 minutes for the to
discharge to reach minimal voltage levels. Failure to do so can result in
personal injury or death.
WARNING: Circumstances that can cause an explosion may exist, which may
lead to personal injury or death, property damage, or economic loss. If the
branch circuit protection device trips, you must use the software to verify
that the source brake function is still operational before putting the
equipment back in service. If the source brake function is not working
properly, loss of brake function or motor damage can occur.
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