Lincoln Electric SVM148-B service manual Welding Problems

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F-20				F-20
TROUBLESHOOTING & REPAIR
OBSERVE SAFETY GUIDELINES		TROUBLESHOOTING GUIDE
DETAILED IN THE BEGINNING OF THIS MANUAL.
PROBLEMS	POSSIBLE AREAS OF	RECOMMENDED
(SYMPTOMS)	MISADJUSTMENT(S)	COURSE OF ACTION
	WELDING PROBLEMS
The welding arc is “cold.” The	1. Check for loose or faulty con-	1. Check for the correct open cir-
engine runs normally (3700 RPM	nections at the weld output ter-	cuit voltage (OCV) at the weld-
no load). The auxiliary power is	minals and welding cable con-	ing output terminals. If the cor-
functioning normally.	nections.	rect voltage is present at the
	2. The welding cables may be too	output	terminals,	check for
		loose connections on the heavy
	long or coiled, causing an
		current carrying leads inside the
	excessive voltage drop.
		Ranger 300 D. See the Wiring
		Diagram.
		2. If the OCV is low at the welder
		output	terminals,	perform the
		Engine	Throttle	Adjustment
		Test.
		3. Perform the Output Rectifier
		Bridge Test.
		4. Check for shorted or grounded
		windings in the reactor and also
		in the main stator. See the
		Wiring Diagram.

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 1-800-833-9353.

RANGER 300 D AND 300 DLX