Lincoln Electric SVM194-A service manual 57TROUBLESHOOTING and REPAIRF-57

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F-57TROUBLESHOOTING AND REPAIRF-57

SERIES COIL SHORT CIRCUIT TEST PROCEDURE

WARNING

Service and repair should be performed only by Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.

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

TEST DESCRIPTION

This test checks the short circuit output of the welding generator at each current range tap. This test should be done if the output is considerably higher than indicated on the current controls, or if there appears to be too little difference between the output of adja- cent range switch positions.

CAUTION: Very high loads will be applied to the generator during these tests. Loads higher than 250 amps must only be applied long enough to get stable meter readings. Severe damage may result if a high load is applied for more than a minute or two.

MATERIALS NEEDED

Load bank, preferably with a shorting contactor.

Length of heavy weld cable about 10 feet long (if load bank has no shorting contactor) Ammeter, able to accurately read about 450 Amps.

Misc. hand tools

Voltmeter or Multimeter Tachometer or Multimeter that can read frequency

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CLASSIC® 300D & 300G