GENERAL MAINTENANCE
GB
(GB) 5
GB
TYPE OF BREAKDOWN
POSSIBLE CAUSES
CHECKS AND REMEDIES
No functions operate.
Faulty power cord (one or more
phases disconnected).
Check and remedy.
Blown fuse.
Renew.
Irregular wire feed.
Insufficient spring pressure.
Try tightening regulating knob.
Wire-guide sheath blocked.
Renew.
Wrong race - unsuitable for wire,
or excessively worn.
Turn roller over or change it.
Braking on coil excessive.
Loosen brake using adjusting screw.
Irregular wire feed.
Oxidized, poorly wound,
poor quality wire, with
tangled or overlapping coils, etc.
Remedy by removing defective coils. If problem persists,
change the wire reel.
Reduced welding power.
Earth cable not connected.
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.
Detached or loose connection on
switches
Check, tighten or renew, as necessary.
Faulty contactor
Check the state of the contacts and the mechanical effi-
ciency of the contactor
Faulty rectifier.
Visually check for signs of burn-out; if present, renew recti-
fler.
Porous or spongy welds.
No gas.
Check presence of gas and gas supply pressure.
Draughts in welding area.
Use a suitable screen. Increase gas delivery pressure if
necessary.
Ciogged holes in diffuser.
Clear clogged holes using compressed air.
Gas leakage due to rupture
in supply hoses.
Solenoid valve blocked.
Check and renew faulty component.
Check solenoid operation an electrical connection.
Porous or spongy welds.
Faulty pressure regulator.
Check operation by removing the hose connecting the
pressure regulator to the power source.
Poor quality gas or wire.
Gas must be extra-dry; change the cylinder or use a differ-
ent type wire.
Gas supply does not switch off.
Worn or dirty solenoid valve.
Dismantle solenoid; clean hole and obturator.
Presslng torch trigger
produces no result.
Faulty torch trigger, disconnected
or broken control cables.
Remove the torch connection plug and short-circuit the
poles; if the machine operates properly, check the cables
and the torch trigger.
Blown fuse.
Renew using a fuse of the same rating.
Faulty power switch.
Clean with compressed air. Ensure that wires are tightly
secured; renew switch if necessary.
Faulty electronic circuit.
Renew circuit.
