6 EN
GENERAL MAINTENANCE
EN
TYPE OF BREAKDOWN
POSSIBLE CAUSES
CHECKS AND REMEDIES
No functions operate.
Faulty power cord (one or more phases discon-
nected).
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 efficiency of the
contactor
Faulty rectifier.
Visually check for signs of burn-out; if present, renew rectifler.
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 regu-
lator to the power source.
Poor quality gas or wire.
Gas must be extra-dry; change the cylinder or use a different 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; re-
new switch if necessary.
Faulty electronic circuit.
Renew circuit.
Summary of Contents for DV 4004 CTLW
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