Lincoln Electric R3R 375-I, R3R 500-I manual Recommended

E-2		TROUBLESHOOTING	E-2
	Observe all Safety Guidelines detailed througout this manual
	PROBLEMS	POSSIBLE CAUSE	RECOMMENDED
	(SYMPTOMS)		COURSE OF ACTION
		FUNCTION PROBLEMS
A. Input contactor chatters.		1.Faulty input contactor.	1.Repair or replace.
		2.Low line voltage.	2.Check with Power Company.
B. Machine input contactor does not		1.Supply line fuse blown.	1.Replace (look for reason for
operate.			blown fuse first).
		2.Power circuit dead.	2.Check voltage.
		3.Broken or loose power lead.	3.Repair.
		4.Wrong voltage.	4.Check voltage against
			instructions.
		5.Thermostats tripped. (High	5.a. Make sure the fan is operating
		Temperature Warning Light	and that there are no obstruc-
		should be lit.) (Welder	tions to free flow of air.
		overheated.)	b. Operate at normal current
			and duty cycle.
			c. Replace High Temperature
			Warning Light if defective.
		6.Input contactor coil open.	6.Replace.
		7.Open winding on 115V pilot	7.Replace.
		transformer.
		8.Power ON-OFF switch not	8.Replace.
		closing.
		9.Lead broken or loose connec-	9.Replace.
		tion in 115V starter circuit.
		10.Thermostats defective. (High	10.Turn input power off (115V cir-
		Temperature Warning Light	cuit is hot when input power is
		should be lit.)	connected). Check thermostats
			with continuity meter – should
			read short-circuit when machine
			is cool. Replace if defective.
			There are two thermostats; one
			on the secondary lead and one
			on the choke. Replace High
			Temperature Warning Light if
			defective.

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.

IDEALARC® R3R 375-I, 500-I AND 600-I