Troubleshooting - Helvi UNIMIG 298+T2E Manual De Uso

17.0
This chart will assist you in resolving common problems you may encounter. These are
not all the possible solutions.
PROBLEM
No "life" from welder
Fan operates normally, but
when gun trigger pulled,
there is no wire feed, weld
output or gas flow
Feed motor operates but
wire will not feed
Lack of penetration
Wire is birdnesting at the
drive roller
Wire burns back to contact
tip
Workpiece clamp and/or
cable gets hot.
38
-ENGLISH-

TROUbLESHOOTINg

POSSIBLE CAUSE
Input cable or plug malfunction.
Wrong size fuse.
Faulty trigger on gun
Thermostat intervention
Faulty wire feeding motor (rare)
Insufficient feed roller pressure
Burr on end of wire
Liner blocked or damaged
Voltage or wire feed speed too
low.
Loose connection inside the
machine (rare).
Worn or wrong size contact tip.
Loose gun connection or faulty
gun assembly
Wrong size wire.
Torch moved too fast.
Eccessive pressure on drive roller
Gun liner worn or damaged
Contact tip clogged or damaged
Liner stretched or too long
Contact tip clogged or damaged
Wire feed speed to slow
Wrong size contact tip
Bad connection from cable to
clamp
Slag buildup inside nozzle or
nozzle is shorted.
Wire feed speed too fast
POSSIBLE SOLUTION
Check for proper input cable connec-
tion
Check fuse and replace as necessary
Replace torch trigger
Allow welder to cool. The extinguishing of
the pilot lamp / switch on the front panel
indicates the thermostat has closed.
Replace wire feeding motor
Increase roller pressure
Re-cut wire square with no burr
Clear with compressed air or replace
liner
Re-adjust the welding parameters.
Clear with compressed air and tighten
all connections.
Replace the contact tip.
Tighten or replace torch.
Use correct size welding wire.
Move the gun smoothly and not too
fast.
Adjust pressure on drive roller.
Replace wire liner
Replace contact tip
Cut wire liner at the right lenght
Replace the contact tip
Increase wire speed
Use correct size contact tip.
Tighten connection or replace cable.
Clean or replace nozzle.
Decrease wire feed speed