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Parker 890 drive overcurrent fault

We have a parker 890 CD drive (rated current 12 A) driving a motor of 4 kW. The motor draws constant current of 4A. There is no variation in current at all. We have monitored current through DSE 890 chart also. The motor keeps drawing constant current 4A (30%), DC link voltage remains constant 540V  and all of a sudden the drive shows overcurrent fault and current drops from 4A to zero. Cable length from drive to motor is around 20 m.