1 Spot Welding Application Using a Motor Gun1.12 Tip Wear Detection and Wear Compensation (Motor Gun)1-1131.12.2 Wear DetectionThis section explains the method to detect the tip wear amount by dry spottouch motion and movable side tip detection.1.12.2.1 Dry Spot Touch MotionThe gun axis position is acquired when the movable side (upper) tiptouches the fixed side (lower) tip.Dry spot touch motion is carried out by a SVGUNCL (dry spot) instruction.“Base position (fixed)” will be registered when this operation is executedwhile “base position (fixed)” is not registered on the spot supervisionwindow.When executing the dry spot touch motion again after this registration isdone, the position difference between the detected position and the baseposition is calculated as the whole wear amount (total amount of fixed sidewear amount and movable side ware amount).SVGUNCL GUN#(1) PRESSTWC TWC-A1 2 31. Gun No.2. Wear detection pressure condition3. Wear detection operation typeNOTEAfter registering the wear base position, do not change thepressure condition settings used for the wear detection dryspot motion.In case the setting is changed, the wear detection may notbe executed appropriately.SUPPLE-MENTAs a pressure condition for the wear detection dry spotmotion, the dry spot pressure file (PRESSCL tag) can beused other than the wear detection pressure condition(PRESSTWC tag) described in chapter 1.12.2.1 Dry SpotTouch Motion and chapter 1.12.2.2 Movable Side TipDetection.When the wear detection pressure condition (PRESSTWCtag) is used, the dry spot is executed under the condition ofthe {TOUCH SPEED} and {DETECT PRESSURE} on thespot supervision window.When the dry spot pressure file (PRESSCL tag) is used, thedry spot is executed under the dry spot pressure file condi-tion.Setting in the dry spot pressure file can be changed duringthe operation because the file may be used in other pur-poses other than wear detecting. For this reason, it is recom-mended to use the wear detection pressure condition(RESSTWC tag).123 of 198
