DC-Bus Overvoltage

What does OU mean?

The DC-bus voltage has exceeded its maximum permissible limit. This can be caused by an excessively high incoming mains voltage, or by regenerative energy feedback from the motor during braking or feedback operation. If the drive cannot dissipate this excess energy, the overvoltage can damage the internal power components.

Complete Troubleshooting Guide

1. 1

   Measure and verify the incoming mains voltage to ensure it is within the specified operating range for the drive.

2. 2

   Increase the deceleration times in the drive parameters to reduce the rate of regenerative energy generation from the motor.

3. 3

   If a brake chopper and resistor are installed, check their selection, connection, and functionality to ensure effective dissipation of regenerative energy.