AB 28 fault code meaning

AB / 28

Series: PowerFlex 700S Phase II

VPL/MC Comm Fail

AC drive

Meaning: A communication failure has occurred between the Velocity Position Loop (VPL) processor and the Motor Control (MC) processor on the main control board. Possible causes are: VPL is flashing MC firmware into the MC processor when HIM indicates "Loading Config".

Possible causes

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