Analysis the Reason of Head and Tail Pully Driving and Bidirectional Motor Negative Phase Sequence over Current Protection Malfunction

Analysis the wiring of head and tail pully driving & bidirectional 6KV motor，and found the reason of negative phase sequence over current protection malfunction did occur when the motor ran in the reverse direction , then compared the solution methods to make sure which one is better. At last use the method that change the sampling program to make the motor negative phase sequence over current protection wil in effect.