Chopper board, Input voltage and resistance test, Troubleshooting & repair – Lincoln Electric MULTI-WELD SVM151-A User Manual

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TROUBLESHOOTING & REPAIR

F-26

MULTI-WELD 350

CHOPPER PC BOARD INPUT VOLTAGES AND RESISTANCE TEST

WARNING

Service and repair should be performed by only 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 1-800-833-9353 (WELD).

TEST DESCRIPTION

This test will determine if there are shorted IGBTs or Chopper PC Boards. This test will
also verify that the Chopper PC Boards are receiving the correct operating voltages.

MATERIALS NEEDED

Volt/Ohmmeter
3/8"Nut driver
7/16" Wrench
Wiring Diagram

This procedure should take approximately 50 minutes to perform.