Undervoltage Alarm

What does UV mean?

This is a warning displayed on the digital operator during a momentary power loss event. It indicates that incoming AC power has been interrupted, but the drive's control power supply is still being maintained. The alarm signifies the drive is in a ride-thru state and will precede a UV1 fault if power is not restored within the configured ride-thru time (L2-02).

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Check for loose connections in the AC input power circuit to ensure stable and continuous power delivery to the drive.