[Cause]
It may be due to the following reasons:
1. It is possible that the tip of the welding gun contacted the sharpener blade prematurely.
2. It is possible that the teaching position of the welding gun or the position of the grinder is incorrect.
3. It is possible that the welding gun tip and the dresser are not parallel.
4. The zero point calibration position of the welding gun is incorrect (the wear amount of the welding tip is incorrect).
[Countermeasures]
Take the following countermeasures:
1. Confirm the teaching position of the welding gun or the position of the grinder.
2. Confirm the specified thickness value of the pressurization condition or the zero point calibration position of the welding gun.
3. Please increase the allowable error of contact ($SGTDSET[#Grinder number].$CNTCT_THRSH:Standard 3mm).