Lincoln Electric IM 513-B manual Troubleshooting, Trouble Causes What to do

TROUBLESHOOTING

TROUBLE		CAUSES		WHAT  TO  DO
1. Machine has no output	a.	Electrode or work lead loose or
			a.	Repair Connection.
with machine switch in		broken.
CV mode.
	b.	No generator output.	b. Refer to quick check procedure for
				generator only.
	c.	CR4 is not working, or no input to	c. Refer to procedure for Checking the
		CR4.		Cold Tip Contactor (CR4).
	d.	Protective circuits operating due to	d.	Turn engine off. Remove short
		output short circuit.		circuit.
	e.	Broken or loose wiring connec-	e.	Broken or loose connections from
		tions.		WFM to control panel and engine
				welder. Refer to wiring diagram to
				check.
	f.	Defective P.C. Board	f.	Refer to P.C. Board Troubleshooting
				Procedure.
2. Machine has minimum	a.	No shunt field voltage.	a.	In CV mode, check for 10-60 VDC
output and no control.				across pin 8 of J3 and pin 1 of J4 on
				WFM P.C. Board.
				-- Check for loose or broken
				connections in wiring harness.
				-- Refer	to	P.C.	Board
				Troubleshooting Procedure.
	b.	Excessive current, thermal shut-	b.	Remove load and allow machine to
		down.		cool down.	If output returns after
				cool down, reduce output or duty
				cycle.
				-- Check for continuity at quick con-
				nects between leads 609 and 608
				inside the WFM.
				-- Check wiring harness with these
				connections.
				-- Check continuity of the thermostat
				located on the generator negative
				brushholder.
	c.	Open in feedback circuitry.	c.	Check in-line connector, P.C. Board,
				and wiring harness plugs, especially
				leads 667 and 621.
	d.	Voltage adjust potentiometer circuit	d.	Refer to procedure for checking
		open or misconnected.		Voltage Control Potentiometer on
				Machine. Check wiring of lead num-
				bers 75, 76, and 77.
	e.	Defective P.C. Board.	e.	Refer to P.C. Board Troubleshooting
				Procedure.

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