Lincoln Electric SVM123-A service manual Function Problems

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F-9	TROUBLESHOOTING & REPAIR				F-9
	Observe all Safety Guidelines detailed throughout this manual
	PROBLEMS	POSSIBLE AREAS OF		RECOMMENDED
	(SYMPTOMS)	MISADJUSTMENT(S)		COURSE OF ACTION
		FUNCTION PROBLEMS
Machine shuts off (input contac-		1. Remove all welding cables	1. Check for grounds and or
tor drops out) when the welder		and control cables from the		shorts in the #73, #74, #75,
output terminals are electrically		DC-1000. Jumper #2 to #4 at		#76, #77 circuit. See wiring
energized. (#2 to #4 closure at		the terminal strip. If the		diagram.
terminal strip.)		machine does NOT shut off
		and normal open circuit volt-	2.	Check for grounds and shorts
		age is present at the welder		in the welder output terminals
		output terminals, the problem		and associated leads. See
		is external to the DC-1000.		wiring diagram.
		Either the remote leads #73,
		#74, #75, #76 or #77 are	3.	Check the output shunt and
		grounded to the negative out-		associated leads. See wiring
		put cable, or there is a short		diagram.
		on the welding output termi-
		nals.	4. Perform the Control Board
				Test.
		2. If the machine still shuts off
		when all control and welding
		cables are removed, then the
		problem is internal to the DC-
		1000.
The DC-1000 will NOT shut off		1. Contact your local Lincoln	1. The input contactor (1CR)
when the Stop button is pushed.		Authorized Field Service		contacts may be stuck closed.
		Facility.		Check and replace if neces-
				sary.
			2. The Interlock contacts (part of
				1CR) may be faulty. Replace
				if necessary.
			3. The Start/Stop button may be
				faulty. Check or replace.

CAUTION

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 216-383-2531 or 1-800-833-9353.

IDEALARC DC-1000