1. Check if the insulation of the wire from U-V-W to the hybrid servo motor is bad.
2. Check if the hybrid servo motor is stalled.
3. Such errors occur when the red light of PG card flashes. The causes of these errors could be loose contact/ disconnection between encoder, motor drive and motor.
4. When such errors occur at the beginning, during or at the end of pressure/ flow command
 Adjust also the ramp up/down rate of pressure/flow command (Pr00-29 to Pr00-32)
or
 Adjust the pressure/ flow reference time (Pr00-46~ Pr00-49) or
 Adjust the slope from the hybrid servo drive.
5. When such errors occur while pressure/ flow command is constant, adjust PI value (Pr00-20 ~ Pr00-25)
6. Make sure if there is any disturbance/ noise, set Pr00-04: #11 (Pressure feedback),

#12(Pressure command), 25 (flow rate command). Then observe if the values fluctuate.
7. Replace the hybrid servo drive with a larger output capacity model.