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.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

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