Output phase loss protection

What does E.LF mean?

This fault indicates a loss of one or more phases (U, V, W) on the inverter's output side, typically between the inverter and the motor. This protective function, which can be enabled by Pr. 251, stops the inverter output to prevent motor damage from unbalanced current flow. Operating a three-phase motor with a phase loss can severely overheat and damage the motor windings.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Verify that Pr. 251 (Output phase loss protection selection) is set to '1' to enable this protective function.