Quote Originally Posted by wmgeorge View Post
Turning the power on and off to your VFD will not cause a problem. You should Never turn off the power going to the spindle motor when the VFD is powered up it will cause the VFD to fail. My guess the VFD is either programmed wrong or defective.

My drive is not Chinese maybe that makes a difference as it does not lose the programing.

It does not matter what VFD Drive it is they don't like being plugged in and unplugged and should never be installed like this

The problem is he is not turning the power off, he is unplugging it this by it's self is going to mess up the VFD or damage it, here is a snip from the VFD Drive manual