Input Phase Loss

What does PF mean?

The Drive input power supply has an open phase or a large imbalance of input voltage. This can be caused by a missing phase, loose terminal screws, momentary power loss, or significant input voltage fluctuations. Operating with phase loss can lead to drive component stress and damage.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Investigate for momentary power loss events or large input voltage fluctuations in the supply.

2. 4

   Adjust parameter L8-06 (Input Phase Loss Detection Level) according to your application; a higher value makes detection less sensitive.