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Alarm / Fault code 27 in allen bradley PowerFlex 755 drive

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Cause : Torq Prove Cflct comes when P1100 [Trq Prove Cfg] is enabled, these parameters must be properly configured first is P35 [Motor Ctrl Mode] and another is P125 [Pri Vel Fdbk Sel] and P135 [Mtr Psn Fdbk Sel] must be set to a valid feedback device.

  1. The feedback device does not have to be the same device.
  2. However, Open Loop and Simulation Feedback are not considered valid feedback devices.
  3. If parameters 125 and 135 are set to a feedback module, verify that the module parameters are set properly.
  4. On the module, the feedback loss action CANNOT be set to 0 “Ignore.” Does not work in PM FV mode.
  5. Does not work with single ended or channel A only encoders.
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