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LN-15
TROUBLESHOOTING & REPAIR
F-6 F-6
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
FEEDING PROBLEMS
The wire stops or stubs while
welding.
1. If the LN-15 is connected to a
constant current power source
the arc voltage may be “dip-
ping” below the 15VDC thresh-
old that is essential for proper
operation.
2. Try connecting the LN-15 to a
constant voltage power
source.
3. Check for mechanical restric-
tions in the wire feeding path.
1. Monitor the motor armature
voltage (leads 550 to 551).
Normal voltage range is 2.6VDC
to 27.4VDC dependent upon
wire feed speed. If the armature
voltage is correct then check or
replace the motor brushes.
2. If the motor armature voltage is
not correct then the Control
Board may be faulty.
The wire feed speed range is only
50 to 374 IPM.(1.3 to 9.5m/min.
1. The 83%wire feed speed dual
procedure is activated with the
low speed gear.
1. Turn off the 83% procedure
switch to return to the full wire
feed speed range.
2. Check the wiring between the
procedure switch and the con-
trol board. See the Wiring
Diagram.
3. The control board may be faulty.
Replace.
The wire feed speed range is only
50 to 600 IPM.(1.3 to 15.3 m/min)
1. The 83%wire feed speed dual
procedures switch is activated
with the high speed gear in
place.
1. Turn off the 83% procedure
switch to return to the full wire
feed speed range.
2. Check the wiring between the
procedure switch and the
Control Board. See the wiring
diagram.
3. The Control Board may be
faulty. Replace.
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.
TROUBLESHOOTING GUIDE Observe Safety Guidelines
detailed in the beginning of this manual.