A: When a low-power SP100 is used to drive a pump of the same power rating, E4, E5, and E6 overcurrent faults may occur. What could be the cause?

After analyzing the match between the output current and frequency, as well as the unpredictability of the three different overcurrent faults, it was determined that the issue is a hardware filtering problem.

Recommendation:

Slightly reduce the carrier frequency and slip compensation parameters, and fine-tune the settings based on on-site operating conditions until stable operation is achieved.