[Cause]
Excessive load was detected when the electrode tips contacted during automatic threshold measurement motion. The gun axis mastering is incorrect.
[Countermeasure]
Check for foreign matter between the electrode tips during threshold measurement and master the gun axis again. Then perform the measurement motion again. If this alarm continues to occur, the gun's sliding friction exceeds the friction measured during automatic tuning. Eliminate the cause of the increased friction, perform automatic tuning again, or try both.