Lincoln Electric LN-15 WIRE FEEDER SVM166-A Service Manual page 44

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TROUBLESHOOTING GUIDE TROUBLESHOOTING GUIDE
PROBLEMS
(SYMPTOMS)
The wire stops or stubs while
welding.
The wire feed speed range is only
50 to 374 IPM.(1.3 to 9.5m/min.
The wire feed speed range is only
50 to 600 IPM.(1.3 to 15.3 m/min)
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 & REPAIR
POSSIBLE AREAS OF
MISADJUSTMENT(S)
FEEDING PROBLEMS
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
source.
3. Check for mechanical restric-
tions in the wire feeding path.
1. The 83%wire feed speed dual
procedure is activated with the
low speed gear.
1. The 83%wire feed speed dual
procedures switch is activated
with the high speed gear in
place.
CAUTION
LN-15
detailed in the beginning of this manual. detailed in the beginning of this manual.
RECOMMENDED
COURSE OF ACTION
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.
voltage power 2. If the motor armature voltage is
not correct then the Control
Board may be faulty.
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.
Diagram.
3. The control board may be faulty.
Replace.
1. Turn off the 83% procedure
switch to return to the full wire
feed speed range.
2. Check the wiring between the
procedure
Control Board. See the wiring
diagram.
3. The Control Board may be
faulty. Replace.
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Observe Safety Guidelines Observe Safety Guidelines
See the Wiring
switch and the