Lincoln Electric DC-655 service manual Control, Board LED Chart

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F-5		F-5
		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
	OUTPUT PROBLEMS
The input contactor chatters.	1. Check the three-phase input	1.	Check for loose or faulty wiring
	line voltage at the machine.		between	the	input	power
	The input voltage must match		switch (SW1), the fault protec-
	the rating plate and reconnect		tion relay (CR2) and the input
	panel configuration.		contactor.	See the		Wiring
			Diagram.
		2.	The fault protection relay (CR2)
			may have	defective contacts.
			Check or replace.
		3.	The control board may be
			defective.	See	the	Control
			Board LED Chart.
		4.	The input contactor may be
			faulty.
The machine is dead - the input	1. Check the three-phase input	1.	Check the wiring between the
contactor does not operate. The	line voltage at the machine.		fault protection relay (CR2) and
pilot light is lit.	The input voltage must match		the input contactor (CR1).
	the rating plate and reconnect	2.	The fault protection relay (CR2)
	panel configuration.
			may have	defective contacts.
	2. Turn the machine off and then		Check or replace.
	back on to reset the fault pro-	3.	The input	contactor		may be
	tection circuit. See the Control
			faulty.
	Board LED Chart.

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.

IDEALARC DC-655