Lincoln Electric R3R-500, R3R-300 service manual Input Contactor

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F-7		F-7
	TROUBLESHOOTING & REPAIR
	TROUBLESHOOTING GUIDE	Observe Safety Guidelines
		detailed in the beginning of this manual.

PROBLEMS	POSSIBLE AREAS OF			RECOMMENDED
(SYMPTOMS)	MISADJUSTMENT(S)			COURSE OF ACTION
		OUTPUT PROBLEMS
The machine does not have maxi-	1. Make sure the correct three-			1.	Check the Output Control (R1).
mum output.		phase input voltage is being			Normal	resistance is				10,000
		applied to the machine.			ohms.	Also check associated
	2.	Make certain the Dial	Control		wiring for loose or faulty con-
					nections.		See	the		Wiring
		Switch (SW3) is in the correct
					Diagram.
		position. (Not present on R3R
		300).		2.	Check	the	Ouptut			Control
	3.	If the remote control	is being		Switch	(S2)	and	associated
					wiring. See the Wiring Diagram.
		used, set the Output Control
		Switch (SW2) to the Machine or		3.	Perform the Main Transformer
		Local position and control the			Test.
		weld output with the machine		4.	Perform	the		SCR/Diode
		Output Control (R1).	If the
					Bridge Rectifier Test.
		problem is resolved, check the
		remote control unit and associ-		5.	If the Pocket Amptrol					is not
		ated cable leads. If the Pocket			functioning		properly,		perform
		Amptrol option is being used,			the Pocket		Amptrol			Circuit
		the Pocket Amptrol circuit may			Test.
		be faulty.		6.	The control		board		may be
					faulty. Replace.
The machine will not shut off when	1. Make sure the three-phase			1.	Check the Input Power Switch
the power switch is put in the OFF		input lines are connected cor-			(S1) and associated leads. See
position.		rectly to the R3R machine.			the Wiring Diagram.
				2. Perform		the	Input Contactor
					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 216-383-2531 or 1-800-833-9353.

IDEALARC R3R