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The wire stops or stubs while
welding.
NOTE:On codes above 10100, the
motor leads (541 & 539) are
in Control Board Connector
J4, pins 13 & 14.
FEEDING PROBLEMS (Continued)
TROUBLESHOOTING AND REPAIR
Observe Safety Guidelines
detailed in the beginning of this manual.
Troubleshooting Guide – See Wiring Diagrams for location of specified
components. See Wiring Diagrams for troubleshooting of specific circuits.
F-5F-5
LN-25™
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
The wire feeds for a short period of
time but then stops feeding. When
the gun trigger is released and
then retriggered, the wire resumes
feeding but soon stops again.
1. The drive motor may be
overloaded. Check the wire
feeding path for mechanical
restrictions.
2. While welding make certain the
power source arc voltage is
staying above 15 VDC. The
feeder will not function properly
on less than 15 VDC.
1. Check the motor armature
current through either of the
armature leads (539 or 541). A
typical value is 4 amps DC.
2. If 5 amps or less is indicated
and the armature voltage is
being disabled by the control
board, then the control board
may be faulty. Replace.
3. If more than 5 amps is
indicated, then the motor is
drawing too much armature
current. Check and or replace
the motor brushes.
4. The motor or gearbox may be
faulty. Replace.
1. If the LN-25™ is connected to
a constant current power
source, the arc voltage may be
“dipping” below the 15 VDC
threshold that is essential for
proper LN-25™ operation.
2. Try connecting the LN-25™ to
a constant voltage power
source or a flatter slope output.
3. Make sure the wire feed mode
switch (S3) is in the correct
position for the power source
being used, and proper speed
setting is used for the
procedure.
4. Check for mechanical
restrictions in the wire feed
path.
1. Monitor the motor armature
voltage (leads 539 to 541).
Normal range is 2 to 23 VDC.
If the armature voltage is
proper, then check or replace
the motor brushes.
2. If the motor armature voltage is
not correct, then the control
board may be faulty. Replace.
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
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