Lincoln Electric IM620-B manual Problems Possible Symptoms Cause, Recommended Course of Action

E-2 TROUBLESHOOTING E-2

PROBLEMS	POSSIBLE
(SYMPTOMS)	CAUSE
	FEEDING PROBLEMS
No wire feed when gun trigger is	1.	Power source must be on
pulled		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.

Wire feeds for a short time but	1. The drive motor may be
stops feeding. When gun trigger	overloaded. Check the wire
is released and retriggered wire	feeding system. EX. Drive
feeding starts but stops again.	roll tension, reel brake and
	gun cable liner.

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

RECOMMENDED COURSE OF ACTION

Contact your local

Lincoln Authorized

Field Service Facility

CAUTION

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.

LN-25