A: GD300-01A-315G-4 drives permanent magnet synchronous air compressor, fault phenomenon: STo or OV1 is reported when running to 120HZ. How to solve it?

Reason analysis: 

The motor has a power of 280kW, a rated frequency of 150HZ, and a rated current of 487A. When the new machine is tested and running at 150HZ, the load current of about 640A is significantly higher.

Solution: 

Check the balance of the three-phase output voltage and output current of the frequency converter. If the current measured by the clamp meter is consistent with the frequency converter display, it indicates that the hardware is normal.

Checked the oil circuit of the air compressor and found no mechanical abnormalities. Do autotuning of the motor parameters and optimize parameter P02.21 from 0.19 to 0.15 and P02.22 from 0.37 to 0.25. The maximum current during 150Hz operation is around 480A, and the operation is stable.