Lincoln Electric SVM194-A service manual Exciter Stator Short Circuit & Ground Test Procedure

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F-50	TROUBLESHOOTING AND REPAIR		F-50
	EXCITER STATOR SHORT CIRCUIT & GROUND TEST PROCEDURE
PROCEDURE		(continued)
1.	Open either, or both of the side doors.
Note: Secure the doors in the open position using
	the door restraint system. If the machine
	does not have a door restraint system,
	remove the doors or securely restrain them
2.	to prevent them from falling closed.
	Make sure that nothing is plugged into the aux-
3.	iliary receptacles.
	Disconnect and isolate the ground lead con-
	nected to the neutral side of the 115 VAC auxil-
4.	iary receptacle. See the wiring diagram.
	Disconnect and isolate the exciter winding
	leads. (Leads 214 and 215) In earlier codes,
	these wires were color coded yellow and did not
5.	have numbers. See the wiring diagram.
	Using an ohmmeter; check the resistance
	between the following points. Resistance
	should read very high, 500,000 (500k) ohms
	minimum.

• From chassis ground and one of the exciter winding leads.

• From chassis ground and one of the neutral terminals of the 115 VAC receptacle. (The neu- tral terminal is the longer of the two slots.)

• From one of the neutral terminals of the 115 VAC receptacle to one of the exciter leads.

6. If any of these readings are less than 500,000 (500k) ohms, be certain that the windings are completely dry and check for grounded compo- nents or wiring that remain connected to the stator, such as circuit breakers, receptacles, etc. See wiring diagram. If necessary, discon- nect and isolate the stator leads as close to the stator winding as possible.

7. If the low resistance to ground, or between indi- vidual stator windings is determined to be with- in the stator, the stator is defective and should be replaced.

CLASSIC® 300D & 300G