Input Phase Loss

What does PF mean?

The drive has detected a loss of one or more phases in its incoming AC power supply. This can lead to improper operation, reduced motor performance, or drive damage.

Click steps to track your progress.

1. 1

   Measure incoming AC supply voltage at the drive's R/L1, S/L2, T/L3 input terminals to confirm all phases are present, balanced, and within specifications.

2. 2

   Inspect all upstream power components (e.g., circuit breakers, fuses, contactors, wiring connections) for damage, loose terminals, or signs of overheating.

3. 3

   Verify the integrity and continuity of the incoming power feeder cables from the main distribution point to the drive's input terminals.

4. 4

   Check the drive's input power monitoring parameters (e.g., undervoltage trip levels, phase loss detection sensitivity) to ensure they are correctly configured for the incoming supply and not overly sensitive.