Lincoln Electric IM553-C manual Troubleshooting, Problems

E-2		TROUBLESHOOTING	E-2
	Observe all Safety Guidelines detailed throughout this manual
	PROBLEMS	POSSIBLE AREAS OF	RECOMMENDED
	(SYMPTOMS)	MISADJUSTMENT(S)	COURSE OF ACTION
		PROBLEMS
Machine fails to hold the “heat” con-		a. Rough or dirty commutator.
stantly.
		b. Brushes may be worn down to
		limit.
		c. Field circuit may have variable
		resistance connection or intermit-
		tent open circuit due to loose con-
		nection or broken wire.
		d. Electrode lead or work lead con-
		nection may be poor.
		e. Wrong grade of brushes may
		have been installed on generator.
		f. Field rheostat may be making
		poor contact and overheating.	Contact your Local Lincoln Authorized
			Field Service Facility for technical
Welder starts but fails to generate		a. Generator or exciter brushes may	troubleshooting assistance.
current.		be loose or missing.
		b. Exciter may not be operating.
		c. Field circuit of generator or
		exciter may be open.
		d. Exciter may have lost excitation.
		Flash Fields(1)
		e. Series field and armature circuit
		may be open-circuited.
(1)FLASHING THE FIELDS:

1.Stop the engine welder and remove the cover from the exciter.

2.Turn the “Fine Adjustment Control” (rheostat) to “100” on the dial.

3.Using a 12 volt automotive battery, connect its negative terminal to the negative brush holder. The negative brush holder is the one nearest to the rotor lamination. See the wiring diagram. With the engine NOT running, touch the positive battery ter- minal to the positive brush holder. Remove the bat- tery from the circuit.

4.Replace the exciter cover. Start the welder and the generator voltage should build up.

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.

CLASSIC II DEUTZ