sir we buy new 591P 725A DC drive . sir we using 10 prker dc drive all are showing display is 2QUARDENT drive . but sir this drive showing 4quardent . also when the motor is running with load motor become jerking and ampere is fluctuating. used another drive parameter but same problem . so now i install old drive and run the motor . i couldn't run the drive . sir please give me one suggestion.