Lincoln Electric SVM146-A service manual Torch Continuity and Solenoid Test, Test Procedure

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F-24 F-24

TROUBLESHOOTING & REPAIR

TORCH CONTINUITY AND SOLENOID TEST (continued)

FIGURE F.5 - TORCH CONNECTOR - MACHINE END

				7		8
			6			9
			5
			4			1
				3		2
	TEST PROCEDURE					3. Using the ohmmeter, check the torch resis-
	1. Remove input power to the PRO-CUT 80					tances per Table F.5.
						NOTE: Take the “Pin” test point measurements
		machine.
2.		Remove the torch	assembly from	the			at the machine end of the torch assem-
							bly. See Figure F.5.
		machine.
			TABLE F.5 - TORCH ASSEMBLY RESISTANCES
		TEST	CIRCUIT(S) BEING			EXPECTED		TEST
		POINTS	TESTED			RESISTANCE		CONDITIONS
		Pin 7 to Pin 8	Parallel pilot arc			1.5 ohms maximum		None
			leads
		Pin 7 to Torch	One pilot arc lead to			1.0 ohm maximum		Torch consumables
		Nozzle	nozzle					in place
		Pin 8 to Torch	One pilot arc lead to			1.0 ohm maximum		Torch consumables
		Nozzle	nozzle					in place
		Pin 1 to Pin 9	Torch trigger circuit		100K ohms minimum			Torch trigger NOT
								pulled (not activated)
		Pin 1 to Pin 9	Torch trigger circuit			1.0 ohm maximum		Torch trigger pulled
								(activated)
		Pin 2 to Pin 3	Electrode Solenoid			45 to 55 ohms		None
		Pin 7 to Torch	Pilot and Electrode			1.0 ohm maximum		Torch consumables
	Electrode at machine		circuit					in place
		end of torch
		Pin 8 to Torch	Pilot and Electrode			1.0 ohm maximum		Torch consumables
	Electrode at machine		circuit					in place
		end of torch
4.		If any of the resistance checks are not cor-				5. Carefully apply the 12 VDC supply to the
		rect, the torch assembly may be faulty.				electrode solenoid.		(positive to Pin 2 and
		Repair or replace.				negative to Pin 3).		The electrode solenoid
						should activate. Listen for the solenoid
						action in the torch handle. If the solenoid
						does not activate, it may be faulty. Replace.

PRO-CUT 80