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Alarm / Fault code 77 in allen bradley PowerFlex 755 drive

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Cause : IR Volts Range- “Calculate” is the autotune default and the value that is determined by the autotune procedure for IR Drop Volts is not in the range of acceptable values.

  1. The value for P73 [IR Voltage Drop], which is calculated from the motor nameplate data, is not within the range of acceptable values, as determined by the Calculated Autotune procedure.
  2. Check the motor nameplate data against parameters P25 [Motor NP Volts] through P30 [Motor NP Power].
  3. Re-enter motor nameplate data.
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