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LN-15
TROUBLESHOOTING & REPAIR
F-7 F-7
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
FEEDING PROBLEMS
The wire feed motor runs very fast
and there is no control.
1. Make sure the LN-15 is operat-
ing in the CV mode.
2. Make sure the wire speed con-
trol and procedure switch are
operating correctly. See the
wiring diagram
1. Perform the Wire Drive Motor
Test.
2. Perform the Hall Effect Module
Test.
3. The Control Board may be faulty.
Replace.
The wire feed speed varies during
welding but the meter reading
remains constant.
1. The drive rolls may be slipping
causing feeding problems.
2. The LN-15 may be in the
Constant Current mode. Verify
on power-up that the LN-15 is
set for Constant Voltage weld-
ing.
3. Reduce the spindle brake resis-
tance.
1. Perform the Wire Drive Motor
Test.
2. Perform the Hall Effect Module
Test.
CAUTION
If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con-
tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call
1-888-935-3877.
TROUBLESHOOTING GUIDE Observe Safety Guidelines
detailed in the beginning of this manual.