Lincoln Electric 200 service manual Shunt Field Winding Test

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F-4	TROUBLESHOOTING & REPAIR			F-4
Observe Safety Guidelines detailed in the beginning of this manual.
	PROBLEMS	POSSIBLE AREAS OF	RECOMMENDED
	(SYMPTOMS)	MISADJUSTMENT(S)	COURSE OF ACTION
The engine starts and runs at		OUTPUT PROBLEMS	1. Check for loose or broken
		1. Check for loose or missing
correct speed, but there is no, or		brushes in the DC exciter.	wires between the exciter
very low, welder output voltage.		2. The exciter may need	brushes and the DC
There is no DC auxiliary output			receptacle and the fine
		“flashing.” See Flashing the	current control field rheostat.
voltage.		Fields in this section.	See the Wiring Diagram.
			2. Perform the DC Exciter Test.
The engine starts and runs at		1. Check the welding cables for	1. Check the fine current control
the correct speed but there is no,		loose or faulty connections.	field rheostat for resistance
or very low, welder output. The		2. Check for loose or missing	and proper operation. Normal
DC auxiliary output voltage is			resistance is 64 ohms. Check
normal.		brushes in the welding	associated wires for loose or
		generator.	faulty connections. See the
		3. Check for open circuit voltage	Wiring Diagram.
		at weld studs, check heavy	2. Perform the Main Generator
		current carrying leads for loose	Shunt Field Winding Test.
		or corroded connections	3. Check the continuity of the
			interpole coils. They should
			show continuity from the
			positive brusholders to the
			positive output terminal and
			should NOT be grounded to
			the generator frame.
			4. Check the continuity of the
			series coils. They should
			show continuity from the
			negative brusholders, through
			the current selector switch, to
			the negative output terminal
			and should NOT be grounded
			to the generator frame.
			5. The main armature may be
			faulty. Check for grounds
			and/or shorts.

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed. Call 1-888-935-3877.

PIPELINER® 200