Lincoln Electric SVM166-A service manual Perform the Wire Drive Motor

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F-7	TROUBLESHOOTING & REPAIR					F-7
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 feed motor runs very fast		1. Make sure the LN-15 is operat-			1. Perform the Wire Drive Motor
and there is no control.		ing in the CV mode.			Test.
		2. Make sure the wire speed con-			2. Perform the Hall Effect Module
		trol and procedure	switch	are
					Test.
		operating correctly.	See	the
		wiring diagram			3. The Control Board may be faulty.
					Replace.

The wire feed speed varies during	1. The drive rolls may be slipping		1. Perform the Wire Drive Motor
welding but the meter reading	causing feeding problems.		Test.
remains constant.	2. The LN-15 may be	in the
			2. Perform the Hall Effect Module
	Constant Current mode.	Verify
			Test.
	on power-up that the LN-15 is
	set for Constant Voltage weld-
	ing.

3.Reduce the spindle brake resis- tance.

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