Mains phase loss

What does WARNING/ALARM 4 mean?

A phase is missing on the supply side of the frequency converter, or the mains voltage imbalance is excessively high. This message can also appear due to a fault in the input rectifier within the frequency converter, potentially leading to drive malfunction or damage.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Review settings in parameter 14-12 (Function at Mains Imbalance) to ensure the drive's response to such conditions is appropriate.