Input Voltage Imbalance (Adv. Code 0)

What does 12 mean?

This fault is triggered when the drive detects a significant voltage imbalance between its input phases or a complete loss of one phase (single-phase condition) while operating under load. Such conditions can lead to excessive current draw, overheating of input components, and potential damage to the drive's input rectifier and DC bus.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Inspect the incoming power supply, including fuses, circuit breakers, contactors, and wiring upstream of the drive, for any issues causing voltage imbalance or a lost phase.

2. 4

   Consult with the facility electrician to address power quality issues at the service entrance or distribution panel upstream of the drive.