Motor Phase Loss

What does OPF mean?

This fault signifies a loss of one or more phases in the power supply to the motor from the drive's output. Common causes include loose or broken motor connections, an open output contactor, or incorrect motor sizing/connection resulting in current instability. Operating with a phase loss can lead to motor overheating, reduced efficiency, and eventual failure.

Complete Troubleshooting Guide

1. 1

   Thoroughly check all power connections between the drive and the motor for looseness or damage.

2. 2

   If an output contactor is used, verify it is closing properly and set [Output Phase Loss] (OPL) to [Output cut] (OAC) (page 94) if necessary for operation with a contactor.

3. 3

   Review and optimize motor parameters such as [IR compensation] (UFr), [Rated motor volt.] (UnS), and [Rated mot. current] (nCr); then perform an [Auto tuning] (tUn) operation (page 43).

4. 4

   For testing, consider temporarily deactivating motor phase loss detection ([Output Phase Loss] (OPL) = [No] (nO)) if running without a motor or with a low-power motor.