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Hi, in order to maintain the large torque even at low running speed, a sensorless vector motor drive would help. Different from common drives, most of the vector motor drives have large torque when...

I think you can take a try of the Veichi sensorless vector drive which is of detailed instruction and stable performance.

When VFD drives are wrong, if you have learned the basic steps about how to troubleshoot it, then it can help you save a lot of time.
You can get more details about VFD troubleshooting here.