Lincoln Electric SVM166-A service manual Feeding Problems

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F-6		TROUBLESHOOTING & REPAIR					F-6
TROUBLESHOOTING GUIDE				Observe Safety Guidelines
			detailed in the beginning of this manual.
	PROBLEMS		POSSIBLE AREAS OF	RECOMMENDED
	(SYMPTOMS)		MISADJUSTMENT(S)	COURSE OF ACTION
			FEEDING PROBLEMS
	The wire stops or stubs while		1. If the LN-15 is connected to a	1. Monitor the	motor	armature
	welding.		constant current power source	voltage (leads 550 to 551).
			the arc voltage may be “dip-	Normal voltage range is 2.6VDC
			ping” below the 15VDC thresh-	to 27.4VDC	dependent upon
			old that is essential for proper	wire feed speed. If the armature
			operation.	voltage is correct then check or
				replace the motor brushes.
			2. Try connecting the LN-15 to a
			constant voltage power	2. If the motor armature voltage is
			source.	not correct then the Control
				Board may be faulty.
			3. Check for mechanical restric-
			tions in the wire feeding path.
	The wire feed speed range is only		1. The 83%wire feed speed dual	1. Turn off the 83% procedure
	50 to 374 IPM.(1.3 to 9.5m/min.		procedure is activated with the	switch to return to the full wire
			low speed gear.	feed speed range.
				2. Check the wiring between the
				procedure switch and the con-
				trol board. See the Wiring
				Diagram.
				3. The control board may be faulty.
				Replace.
	The wire feed speed range is only		1. The 83%wire feed speed dual	1. Turn off the 83% procedure
	50 to 600 IPM.(1.3 to 15.3 m/min)		procedures switch is activated	switch to return to the full wire
			with the high speed gear in	feed speed range.
			place.	2. Check the wiring between the
				procedure	switch	and	the
				Control Board. See the wiring
				diagram.
				3. The Control Board		may	be
				faulty. Replace.

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.

LN-15