Abstract
During the drive speed operation with motor, due to the big difference between the synchronous speed and the motor speed, it likely causes too much current. When the current exceeds a certain limit, it will cause the drive to current protection of the acceleration. For the over-current drive in the tanker case, by analyzing the causes of over-current proceeding, the key points are described from the load check, the drive hardware check, the parameters check, input/output circuit inspection and so on. When the large start torque or acceleration torque is necessary, the motor torque of about 100 to 150% can be generated in the low frequency area by adjusting the torque boost.
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