Lincoln Electric IM812-A - Manual (Page 22)

E-2 TROUBLESHOOTING E-2
LN-35
Observe all Safety Guidelines detailed throughout this manual
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your
Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.
CAUTION
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENTS
RECOMMENDED
COURSE OF ACTION
No wire feed when gun trigger is
pulled.
Wire feeds for a short time but
stops feeding. When gun trigger is
released and retriggered wire
feeding starts but stops again.
Wire feeds OK, but stubs or stops
while welding.
Rough wire feeding or wire not
feeding but drive rolls turning.
1. Power source must be on and
open circuit voltage (OCV)
present at weld terminals.
2. LN-35 work clamp may not be
connected.
3. LN-35 polarity switch must match
electrode polarity.
4. Jumper plug on control or option
board may be loose or missing.
5. The power source O.C.V. must
be above 15 VDC. But not more
than 110 VDC.
6. The gun trigger may be faulty.-
Replace gun.
1. The drive motor may be
overloaded. Check the wire
feeding system. EX. Drive roll
tension, reel brake and gun
cable liner.
1. If the power source is a constant
current type supply the arc
voltage may be “dipping” below
15 VDC causing the LN-35 to
stop or hesitate.
2. Connect a constant voltage type
power supply to the LN-35.
3. Make sure wire-feed mode
switch (S3) is in the proper
position.
1. Gun cable kinked and/or twisted.
2. Wire jammed in gun and cable.
3. Incorrect size or installation
of drive roll and guide tubes.
4. Drive roll loose.
5. Gun cable dirty.
6. Worn drive roll.
7. Electrode rusty and/or dirty.
8. Worn nozzle or cable liner.
9. Partially flashed or melted
contact tip.
10. Incorrect idle roll pressure.
11. Wire reel brake tension set too
high.
If all recommended possible areas
of misadjustment have been
checked and the problem persists,
Contact your local Lincoln
Authorized Field Service Facility.