[Car5858]

LOL you mean a one time use boat anchor.

There are documented problems with this contoler atfter conversion to single phase. The inverter is not able to handle the change well, causes jumpping and HS travel when you try to use grid function.

Try swapping Z and X cards and see if the problem occures on the Z. This should help isoulate the problem.

Sometimes the floresent lighting also interfers with the siginal.

These are just some of the results found.

Personally I would put a xylotech drive on it. I am running this on my router with 406 inoz steepers at 1/8 steps with good results.