Phase Inversion

What does PIF mean?

The sequence of the incoming line phases (L1, L2, L3) does not conform to the expected sequence configured by the 'PHr' parameter in the soft starter. This can cause the motor to rotate in the incorrect direction or prevent it from starting.

• Incorrect wiring of the incoming line phases (L1, L2, L3) to the soft starter, causing a reversal of the expected phase sequence.
• External changes upstream in the power distribution causing a phase sequence reversal (e.g., maintenance on a transformer or switchgear).
• Soft starter parameter (e.g., P6-04 (Phase Rotation Check Enable)) is active and detecting a sequence mismatch from its internal reference.
• Mismatch between the actual incoming phase sequence and the 'PHr' parameter (Phase Rotation) setting in the soft starter.

Click steps to track your progress.

1. 1

   1. Verify the physical wiring sequence of the incoming line phases (L1, L2, L3) to the soft starter's input terminals against the electrical schematic.

2. 2

   2. Use a phase rotation meter to confirm the phase sequence of the incoming power supply at the soft starter's input terminals.

3. 3

   3. Check the soft starter's phase rotation parameter (e.g., P6-04 or 'PHr' for Phase Rotation) and ensure it is enabled and set to match the actual incoming sequence (e.g., 'ABC' or 'ACB').

4. 4

   4. If the application requires a specific motor rotation, swap any two incoming phases (e.g., L1 and L3) at the soft starter input terminals to correct the sequence.