Loss of a Line Phase

What does PHF mean?

One or more incoming line phases to the soft starter are either completely missing or have significantly reduced voltage. This leads to single-phasing conditions which are highly destructive to three-phase motors and can damage the soft starter.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Check the motor connections and any isolating devices between the soft starter and motor for integrity.

2. 4

   Assess the general state of the motor for any pre-existing damage or signs of single-phasing.

3. 5

   Verify the line frequency is within tolerance and check the configuration of the 'PHL' parameter (Phase Loss detection) in the 'PrO' menu if applicable.