Lincoln Electric IM812-A manual Contact your local Lincoln

E-2	TROUBLESHOOTING	E-2
	Observe all Safety Guidelines detailed throughout this manual

PROBLEMS

(SYMPTOMS)

POSSIBLE AREAS OF

MISADJUSTMENTS

RECOMMENDED

COURSE OF ACTION

No wire feed when gun trigger is 1. Power source must be on and

pulled.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.- If all recommended possible areas

	Replace gun.				of misadjustment have been
					checked and the problem persists,
Wire feeds for a short time but 1. The drive		motor	may	be
					Contact your local Lincoln
stops feeding. When gun trigger is	overloaded . Check		the	wire	Authorized Field Service Facility.
released and retriggered wire	feeding system. EX. Drive roll
feeding starts but stops again.	tension, reel	brake	and	gun
	cable liner.

Wire feeds OK, but stubs or stops 1. If the power source is a constant

while welding.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.

Rough wire feeding or wire not 1. Gun cable kinked and/or twisted.
feeding but drive rolls turning.	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.

CAUTION

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.

LN-35