Lincoln Electric IM602-A manual Problems

E-2		TROUBLESHOOTING	E-2
	Observe all Safety Guidelines detailed throughout this manual
	PROBLEMS	POSSIBLE	RECOMMENDED
	(SYMPTOMS)	CAUSE	COURSE OF ACTION

PROBLEMS

Input contactor (CR1) chatters.	1. Faulty input contactor (CR1).
	2. Low line voltage.
Machine input contactor does not	If Power Pilot light is off:
operate.	1.	Make sure the proper three-
		phase input power is applied to
		the DC-655 machine.
	2.	The power switch (SW1) may be
		faulty.
	3.	The pilot transformer may be
		faulty.
	If Power Pilot light is on:
	1.	The input contactor may be
		faulty.
	2.	Input shutdown may be activated
		(LED3 on on Control Board). See
		Shorted Rectifier Fault
		Protection in Operation Section.
Machine input contactor operates,	1. Electrode or work cables may be
but no output when trying to weld.		loose or broken.
	2.	Firing P.C. board is not connected
		or is faulty. See PC board LED
		information.
	3.	Trigger circuit may not be working.
		Place Output Terminals Switch to
		the ON position, or place a jumper
		wire across #2 and #4 on the ter-
		minal strip. If output is enabled
		then check control cable to feeder
		if connected.
	4.	If the thermal protection light is
		ON the machine is overheated.
		Make sure the fan is operating
		and remove the cause of the
		overheating problem.

Contact your Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance.

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.

DC-655