YASKAWA YRC1000 Operator's Manual page 124

1 Spot Welding Application Using a Motor Gun
1.12 Tip Wear Detection and Wear Compensation (Motor Gun)
1.12.2.2 Movable Side Tip Detection
The gun axis position is acquired when the movable side (upper) tip
passes the sensor.
The movable side tip detection operation is carried out by a SVGUNCL
(dry spot) instruction.
"Base position (movable)" will be registered when this operation is
executed while "base position (movable)" is not registered on SPOT
SUPERVISION window.
When executing the movable side tip detection motion again after this
registration is done, the position difference between the detected position
and the base position is calculated as the wear amount at the movable
side.
If this operation is done after the procedures described in
chapter 1.12.2.1 Dry Spot Touch Motion, the wear amount of the fixed
side and the movable side are calculated independently and the results
are indicated on the spot supervision window.
<Example>
SVGUNCL GUN#(1) PRESSTWC TWC-B
1 2 3
1. Gun No.
2. Wear detection pressure condition
3. Wear detection operation type
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