Lincoln Electric LN-25 SVM114-C - Manual (Page 43)

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-5 F-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. T h e d r i ve m o t o r m ay b e
over loaded. Check the wire
fe e d i n g p a th fo r m e c h a n i c a l
restrictions.
2. While welding make certain the
p owe r s o u r c e a r c vo l t a g e i s
s t ay i n g a b ove 1 5 V D C. T h e
feeder will not function properly
on less than 15 VDC.
1. C h e ck t h e m o t o r a r m a t u r e
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
a n d t h e a r m a t u r e vo l t a g e i s
being disabled by the control
board, then the control board
may be faulty. Replace.
3. I f m o r e t h a n 5 a m p s i s
i n d i c a t e d , t h e n t h e m o t o r i s
d raw i n g t o o mu c h a r m a t u r e
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 c o n s t a n t c u r r e n t p owe r
source, the arc voltage may be
“ d i p p i n g ” b e l ow t h e 1 5 V D C
threshold that is essential for
proper LN-25™ operation.
2. Try connecting the LN-25™ to
a c o n s t a n t vo l t a g e p owe r
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
s e t t i n g i s u s e d fo r t h e
procedure.
4. C h e ck fo r m e c h a n i c a l
r e s t r i c t i o n s i n t h e w i r e fe e d
path.
1. M o n i t o r t h e m o t o r a r m a t u r e
vo l t a g e ( l e a d s 5 3 9 t o 5 4 1 ) .
Normal range is 2 to 23 VDC.
I f t h e a r m a t u r e vo l t a g e i s
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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