CEMONT MAXISTAR 250T Betriebs-Wartungs Und Sicherheitsanleitung Seite 8

EN
TYPE OF BREAKDOWN
No functions operate.
Irregular wire feed.
Reduced welding power.
Porous or spongy welds.
Porous or spongy welds.
Gas supply does not switch off.
Presslng torch trigger produces no
result.
GENERAL MAINTENANCE
POSSIBLE CAUSES
Faulty power cord (one or more phases discon-
nected).
Blown fuse.
Insufficient spring pressure.
Wire-guide sheath blocked.
Wrong race - unsuitable for wire, or excessively
worn.
Braking on coil excessive.
Oxidized, poorly wound, poor quality wire, with
tangled or overlapping coils, etc.
Earth cable not connected.
Detached or loose connection on switches.
Faulty contactor.
Faulty rectifier.
No gas.
Draughts in welding area.
Ciogged holes in diffuser.
Gas leakage due to rupture in supply hoses.
Solenoid valve blocked.
Faulty pressure regulator.
Poor quality gas or wire.
Worn or dirty solenoid valve.
Faulty torch trigger, disconnected or broken
control cables.
Blown fuse.
Faulty power switch.
Faulty electronic circuit.
CHECKS AND REMEDIES
Check and remedy.
Renew.
Try tightening regulating knob.
Renew.
Turn roller over or change it.
Loosen brake using adjusting screw.
Remedy by removing defective coils. If problem persists, change the
wire reel.
Check that the power cord is in good condition and make sure that the
ground clamps are flrmly fixed to the works piece, which must be free
of rust, grease and paint.
Check, tighten or renew, as necessary.
Check the state of the contacts and the mechanical efficiency of the
contactor.
Visually check for signs of burn-out; if present, renew rectifler.
Check presence of gas and gas supply pressure.
Use a suitable screen. Increase gas delivery pressure if necessary.
Clear clogged holes using compressed air.
Check and renew faulty component.
Check solenoid operation an electrical connection.
Check operation by removing the hose connecting the pressure regu-
lator to the power source.
Gas must be extra-dry; change the cylinder or use a different type
wire.
Dismantle solenoid; clean hole and obturator.
Remove the torch connection plug and short-circuit the poles; if the
machine operates properly, check the cables and the torch trigger.
Renew using a fuse of the same rating.
Clean with compressed air. Ensure that wires are tightly secured; re-
new switch if necessary.
Renew circuit.
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