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INPUT CONTACTOR TEST
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 electri-
cal 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 troubleshooting
assistance before you proceed. Call 216-383-2531 or 1-800-833-9353 (WELD).
TEST DESCRIPTION
This test will determine if the input contactor is receiving the correct coil voltage and if the con-
tacts are functioning correctly.
MATERIALS NEEDED
Volt/Ohmmeter (Multimeter)
5/16" Nut driver
External 120 VAC supply
Input Contactor (CR1) Simplified Control Circuit, Figure F.6
Square Wave TIG Wiring Diagram (located in the Electrical Diagrams section of this manual)
WARNING
TROUBLESHOOTING & REPAIR
F-28 F-28
SQUARE WAVE TIG 355
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