Troubleshooting - Lincoln Electric LN-25 Operator's Manual

E-2
PROBLEMS
(SYMPTOMS)
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.
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, con-
tact your local authorized field service facility for technical troubleshooting assistance before you proceed.

TROUBLESHOOTING

POSSIBLE
CAUSE
FEEDING PROBLEMS
1. Power source must be on
and open circuit voltage
(OCV) present at weld
terminals.
2. LN-25 work clip may not be
connected.
3. LN-25 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
supply the arc voltage may
be "dipping" below 15 VDC
causing the LN-25 to stop
or hesitate.
2. Connect a constant voltage
type power supply to the
LN-25.
3. Make sure wire-feed mode
switch (S3) is in the proper
position.
CAUTION
LN-25
RECOMMENDED
COURSE OF ACTION
Contact your local
Lincoln Authorized
Field Service Facility
type
E-2