variostar 247 variostar 317, 317-2 operating instructions ... - dpiaca

Fault Cause RemedyTorch and hosepack become very hotOperating-mode selector switch does notfunctionMains fuse or miniature circuit-breakertrips when torch trigger is pressedIntermittent welding delivers unsatisfactorywelding resultsIn spot welding, the quality of the weldspotsis variableInsufficient penetration in spot weldingPoor earth connection or complete break in earthconnectionCurrent cable in the welding torch is faultyMain contactor or step switch is faultyDesign dimensions of torch are not sufficient for thistask, or duty cycle has been exceededControl system or switch are faultyThe fuse or miniature c.b. used is too weak, or isof the wrong typeIntermittent welding time t1 and / or Intermittentpause time t2 are not set correctlySheets not always resting snugly on one anotherSurface of workpiece is too dirtySpot-welding time is too shortSpot-welding power is too lowWirefeed speed is too lowCheck the earthing cable and clampReplace the hosepackChange the contactor or step switchRespect the duty cycle and loading limits and/oruse a more powerful type of torchChange the MR25AUse fuses specified in the Technical Data, or aminiature c.b. with a "U" characteristicUsing the respective dials, alter the Intermittentwelding time t1 and Intermittent pause time t2Press the sheets tightly togetherClean the surfaces of the sheets to be weldedLengthen the spot-welding time by adjusting thespot-welding time dialShift the step-switch to a higher setting (considerusing CO 2 as the shielding gas)Increase the wirefeed speedENGLISH15