Lincoln Electric SVM166-A service manual Troubleshooting & Repair

Return to Section TOC

Return to Section TOC

Return to Section TOC

Return to Section TOC

Return to Master TOC

Return to Master TOC

Return to Master TOC

Return to Master TOC

F-5		TROUBLESHOOTING & REPAIR			F-5
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
	When the gun trigger is activated		1. Check to see if the drive rolls	1. With the gun trigger circuit acti-
	there is no wire feed.		are turning when the gun trigger	vated (see the Wiring Diagram)
			is pulled. If the drive rolls are	and the LN-15 set for constant
			turning, then check for a	voltage operation, check the
			mechanical restriction in the	presence of 2.6 to 27.4VDC at
			wire feed path.	leads 550+ to 551-. This is the
				voltage that is applied to the
			2. If the drive rolls do not turn	wire drive motor. This voltage
			then check to make sure the	is dependent upon the wire
			correct DC voltage is being	feed speed setting.
			applied to the LN-15. (15-
			110VDC).	2. If the correct voltage is being
				applied to the drive motor and
			3. Make sure the gun trigger is	the motor does not run the
			functioning correctly.	motor or motor brushes may be
				faulty.
				3. If the correct voltage is not
				being applied to the drive
				motor the Control Board may
				be faulty.
	The wire feeds for a short period		1. The drive motor may be over-	1. Check the motor armature cur-
	of time but then stops feeding.		loaded. Check the wire feed-	rent through either of the arma-
	When the gun trigger is released		ing path for mechanical restric-	ture leads (550 or 551).	It
	then re-activated the wire resumes		tions.	should not exceed 3.5 amps
	feeding but soon stops again.			DC.
			2. While welding make certain the
			power source arc voltage is	2. If more than 3.5 amps is indi-
			staying above 15VDC. The	cated, then the motor is draw-
			feeder will not function properly	ing too much current. Check or
			on less than 15VDC.	replace the motor brushes.
				3. If less than 3.5 amps is indicat-
				ed and the motor is being dis-
				abled by the Control Board,
				then the Control Board may be
				faulty. Replace.
				4. The motor or gearbox 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