Control Power Supply Voltage Fault

What does Uv2 mean?

The voltage supplied to the control drive input power is too low. This can occur if parameter L2-02 is changed from its default value without installing a Momentary Power Loss Ride-Thru unit, or if there is damage to the control power supply wiring or internal control circuitry, impacting drive control stability.

Complete Troubleshooting Guide

1. 1

   For specific drive models (CIMR-A*2A0004-2A0056 and CIMR-A*4A0002-4A0031), correct parameter L2-02 setting or install an optional Momentary Power Loss Ride-Thru unit.

2. 2

   Cycle power to the drive. If the fault reoccurs, inspect and replace any damaged control power supply wiring, the control board, or the entire drive.

3. 3

   If internal circuitry damage is suspected, cycle power again. If the problem continues, replace either the control board or the entire drive; contact Yaskawa for assistance.