Input Phase Loss

What does PF mean?

The PF fault occurs when the inverter detects the loss of one or more incoming AC power phases. This is determined by monitoring the DC bus voltage ripple; if the voltage difference (∆V) exceeds a threshold for 0.5 seconds, the fault is declared, and the motor coasts to a stop to prevent damage.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Ensure that the input phase loss protection (L8-05) is enabled if this protection is desired. If it's disabled, the inverter will not detect this condition.

2. 4

   Check for any external power supply issues, such as utility fluctuations or brownouts, that could cause momentary phase loss.