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CAPACITOR DISCHARGE PROCEDURE
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 elec-
trical 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).
PURPOSE FOR THE PROCEDURE
This procedure will drain off any charge stored in the four large capacitors that are part of the
FET or IGBT switch board assembly. This procedure MUST be performed, as a safety pre-
caution, before conducting any test or repair procedure that requires you to touch internal
components of the machine.
MATERIALS NEEDED
Volt/Ohmmeter (Multimeter)
5/16" Nut driver
3/8" Nut driver
Insulated gloves
Jumper wire with insulated leads and needle-nose ends
High wattage resistor - 25 to 1000 ohms, 25 watts minimum
Piece of glastic board or similar insulating materials on which to secure the resistor
WARNING
TROUBLESHOOTING & REPAIR
F-23 F-23
POWER WAVE 450
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This procedure takes approximately 25 minutes to perform.