DC Bus Overvoltage (Braking/Earth Leakage)

What does OUE mean?

An overvoltage condition has occurred, specifically related to braking operations or an earth leakage at the motor end. During braking, insufficient deceleration time or an undersized/defective brake resistor can cause this. An earth leakage in the motor or cable also contributes. This fault indicates high stress on the drive's DC bus, potentially leading to component failure.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Perform an insulation resistance test on the motor supply cable and the motor (disconnected from the inverter) to check for earth faults.