The arc is unstable and or “hunting, Troubleshooting and repair, Caution – Lincoln Electric POWER MIG 11521 User Manual
Page 47
WELDING PROBLEMS
Observe Safety Guidelines detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely,
contact the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed.
Call 1-888-935-3877.
CAUTION
Poor arc striking with electrode
sticking or blasting off.
1. Make sure the settings for wire
feed speed and voltage are cor-
rect for the process being used.
2. Make certain the gas shielding is
correct for the process being
used.
3. Make sure the machine’s recon-
nect panel is configured properly
for the input voltage being
applied.
1. The output capacitors may be faulty.
Check for loose connections at the
capacitors. Also check for leaky
capacitors. Replace if necessary.
WARNING: The liquid electrolyte in
these capacitors is toxic. Avoid
contact with any portion of your
body.
2. Perform
the
The arc is unstable and or “hunting” 1. Check for a worn or melted con-
tact tip.
2. Check for loose or faulty connec-
tions on the work and gun cables.
3. Make sure the electrode polarity is
correct for the welding process
being used.
4. Check for rusted or dirty electrode
wire.
5. Make sure the machine’s settings
and shielding gas are correct for
the process being used.
1. Check for loose or faulty connections
at the output terminals, choke, out-
put capacitors, output selector
switch, output contactor, and all
heavy current carrying leads. See
the Wiring Diagram.
2. Check the output selector switch for
proper operation and good connec-
tions.
3. The output capacitors may be faulty.
Check for loose connections at the
capacitors. Also check for leaky
capacitors. Replace if necessary.
WARNING: The liquid electrolyte in
these capacitors is toxic. Avoid con-
tact with any portion of your body.
4. Perform
the
TROUBLESHOOTING AND REPAIR
F-9
F-9
Power MIG® 215XT