[Cause]
The gun touch and spot welding position correction functions require the gun to open several mm before detection motion. However, the gun could not move because this opening position exceeded the opening-side stroke limit. The opening position was clamped to the opening-side stroke limit. If the opening position is clamped, the panel detection start position cannot be secured.
[Countermeasure]
For the gun touch function, close the gun slightly before starting search (probing) teaching. For the spot welding position correction function, reduce any one of the upper surface detection distance, maximum position correction amount or thickness upper tolerance. Also check that the opening-side stroke limit, electrode tip distance condition and specified thickness are appropriate. Change them to appropriate values if necessary.