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Fault code 91 in allen bradley PowerFlex 755 drive

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Cause : Pri VelFdbk Loss comes when a feedback Loss has been detected for the source of P127 [Pri Vel Feedback]. The feedback loss could be due to a problem detected by the feedback option module selected by P125 [Pri Vel Fdbk Sel] or due to a loss in communication between the feedback option module and main control board.

  • The source of primary velocity feedback must be configured not to fault if the feedback loss switchover feature is used.
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