Drives Service & Support > PowerFlex 700 > Fault Finder

Fault Number : 77

Fault Display : IR Volts Range

Fault Name : IR Volts Range

Fault Type : None

Fault Description : "Calculate" is the autotune default and the value determined by the autotune procedure for IR Drop Volts is no in the range of acceptable values.

Corrective Action : Double check that the motor nameplate data in parameters 40-49 is entered properly with the motor attached to the drive. This fault should only occur during the Autotune procedure. By having inaccurate motor nameplate data entered, the IR Drop Volts calculated by the drive are not in a usable range.

Typically the range of parameter 62 [IR Voltage Drop] is anywhere from 0 to 10 volts.

A problem with the motor during autotune can also result in erratic values which may cause this fault.

You will have to run the Autotune procedure again.