Lincoln Electric SVM101-B service manual See Input Rectifier test

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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
No ouput. Main fuses open, indicat-			Inspect input leads for possible	Inspect interior of machine for phys-
ing excessive current draw.			shorts or grounds or misconnec-	ical signs of electrical and heat dam-
			tions.	age. Replace any damaged compo-
				nents after conducting the tests
			Install new fuses and reapply power.	below:
			If fuses open again, go to next col-	1.	See Input Rectifier test.
			umn of this Guide.
				2.	See Switch Board test.
				3.	See Capacitor Balance	tests.
				4.	See Snubber Resistor test.

Machine does not produce more	Check input voltages, fuses, and	1.	See Protection Board Output.
than 250 amps on meter (while	input voltage reconnect procedures.		Voltage test.
welding) when connected to	See Installation section of this man-	2.	Control Board may be defective.
3-phase supply.	ual.
		3.	See Input Rectifier test (com-
			ponent D13).
Machine does not produce more	Normal operation.	No	test necessary. The single-
than 250 amps on meter (while		phase operation is detected by the
welding) while connected to single-	Nothing is wrong.	Protection Board and the output cur-
phase supply		rent is limited accordingly.
Machine operates okay at 230 VAC	Check input voltage and input volt-	1.	Check Re-connect Switches
or lower. No output at 380 VAC or	age reconnect procedures. See	2.	See Protection Board Output
higher	Installation section of this manual.
			test.
		3.	See Capacitor Balance tests.
		4.	See Snubber Resistor test.
		5.	See Switch PC Board test.

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.

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