4

AC line phase fault

Danfoss · VLT 2800 Variable Speed Drive

What does 4 mean?

A phase is missing on the AC line supply side of the adjustable frequency drive. This fault only activates in 3-phase AC line systems. It indicates an issue with the incoming power supply to the drive, such as a blown fuse, tripped breaker, or utility problem.

Additional Steps

Steps 1–2 are listed in Priority Fix.

  1. 3

    Verify incoming power connections to the drive are secure.

Source: Danfoss VLT 2800 Variable Speed Drive
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