Cause : Feedback Loss comes when PI Feedback Loss This fault occurs when PI Feedback Loss Detection is programmed to fault (b5-12 = 2) and the PI Feedback < PI Feedback Loss Detection Level (b5-13) for the PI Feedback Loss Detection Time (b5-14). PI Feedback source (e.g. transducer, sensor, building automation signal) is not installed correctly or is not working.

1. Verify Drive is programmed to receive the PI Feedback source signal.
2. Check to ensure the PI Feedback source is installed and working properly.
3. Check the motor for a phase-to- phase short.
4. Check the Drive for a phase-to- phase short at the output
5. Verify C1-01 and C1-02 are set correctly.
6. Check load conditions.