Power unit: Line asymmetry

What does A30057 mean?

Frequencies detected on the DC link voltage suggest line asymmetry or the failure of a line or motor phase. If this alarm persists, it will eventually trigger fault F30011 after a specific duration. This condition causes imbalanced currents, increased losses, and premature component wear, and if unresolved, will lead to a drive trip, interrupting operation.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   If no phase failure is found, reduce the drive's output power to prevent triggering fault F30011.