Input Phase Loss

What does Input Phase Loss mean?

One or more of the incoming power supply phases to the drive has been lost or experienced a significant voltage drop. This can result from issues in the upstream power grid, tripped circuit breakers, blown fuses, or loose wiring connections at the drive's input terminals. This leads to unbalanced operation and potential damage to the drive.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Verify that all upstream circuit breakers and fuses protecting the drive are intact, properly rated, and not tripped or blown.