The arc is unstable or oscillating, The welding arc is variable or “hunting, Troubleshooting & repair – Lincoln Electric NA-5S User Manual
Page 87: Caution
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TROUBLESHOOTING & REPAIR
F-34
NA-5
Observe all Safety Guidelines detailed throughout this manual
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 216-383-2531 or 1-800-833-9353.
CAUTION
WELDING PROBLEMS
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENTS(S)
RECOMMENDED
COURSE OF ACTION
The arc is unstable or oscillating.
The welding arc is variable or “hunt-
ing”.
1. Check the welding cables for
loose or faulty connections.
2. Make sure the electrode and gas
(if used) is correct for the process
being used.
3. Put the Lincoln power source in
the machine control
mode.Jumper the “BYPASS” pins
on the NA-5 voltage board.
Adjust the weld voltage at the
power source for the process
being used. If the problem is
NOT resolved the power source
may be faulty.
1. Make sure the welding parame-
ters are correct for the welding
procedure being used.
2. Check the welding cables for-
loose or faulty connections.
3. Check the wire feeding path for
restrictions.
4. The contact tip may be worn.
Check or replace.
5. The welding power source may
be faulty. Check or replace.
1. The NA-5 voltage board may be
faulty Replace.
1. Put the Lincoln power source in
the machine control mode.
Jumper the “BYPASS” pins on the
NA-5 voltage board. Adjust the
weld voltage at the power source
for the process being used. If the
problem is resolved check or
replace the control cable or the
NA-5 voltage board may be faulty.