DC Bus Undervoltage

What does DC Undervoltage mean?

The voltage on the internal DC bus has fallen below the minimum detection level (L2-05). This usually indicates a failure of the main power supply, a lost input phase, or an insufficient power supply capacity to meet the drive's demands. This condition causes the drive to shut down or operate erratically.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Inspect all input wiring and associated protective devices for loose connections, open circuits, or faults.