Lincoln Electric SVM194-A Troubleshooting and Repair, Series Coil Short Circuit Test Procedure

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F-58	TROUBLESHOOTING AND REPAIR	F-58
	SERIES COIL SHORT CIRCUIT TEST PROCEDURE (continued)

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PROCEDURE

1. Place the current range switch in the Max posi- tion, connect the Classic® 300 to a load bank and start the engine.

2. Apply a load of 250 amps and allow the machine to reach normal operating tempera- ture, (about 30 minutes)

3. Move the fine current control to the max posi- tion, and then adjust the load bank to obtain a 300 amp load.

4. Read the engine RPM and the voltage at the output terminals. See the Engine RPM Adjustment Tests for instructions on how to check RPM.

Kubota powered models should read 1790 to 1810 RPM, and 34 to 48 VDC at the output terminals. Classic® 300G should read 1780 to 1810 RPM and 33 to 42 VDC at the output terminals. Perkins powered models should read 1650 to 1750 RPM, and 33 to 42 VDC at the output terminals.

5. Remove the load and place the range switch in the minimum position.

6. Shut down the engine and place the length of cable and ammeter between the output termi- nals, or close the shorting contactor on the load bank.

7.Start the engine and read the current in the shorting cable. It should read from 95 to 120 Amps.

8.Stop the engine and move the selector switch to the 80 to 130 Amp tap. Restart the engine and read the current in the shorting cable. It should read from 150 to 200 amps.

9.Stop the engine and move the selector switch to the 120 to 190 Amp tap. Restart the engine and read the current in the shorting cable. It should read from 240 to 300 amps.

10.Stop the engine and move the selector switch to the 160 to 240 Amp tap. Restart the engine and read the current in the shorting cable. It should read from 330 to 410 amps.

11.If the current is considerably higher than indi- cated above for all of the tests, check engine RPM.

12.If some, but not all of the values are signifi- cantly higher than specified, the series coils are likely shorted and should be replaced.

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CLASSIC® 300D & 300G