The CNC is built for Welding Application and the issue is all about the crash happens in Z axis.Did not know the reason for the cause and this problem doesnt occurs often.Need to know whether these following reasons can affect the performance of the CNC Controller.The CNC works fine if it runs in ideal condition without welding but while welding it occurs the same problem.

1. Does welding polarity can affect the servo motor performance?

2. Does the Harmonics disturbs the signals of the servo motor?