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Fault code 20 in allen bradley PowerFlex 755 drive

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Cause : TorqPrv Spd Band comes when the difference between P2 [Commanded SpdRef] and P3 [Mtr Vel Fdbk] has exceeded the level programmed in P1105 [Speed Dev Band] for a time period greater than the time programmed in P1106 [SpdBand Intgrtr].

1. Check wiring between drive and motor.
2. Check release of mechanical brake

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