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 1-888-935-3877.
DESCRIPTION
This test will determine if the weld control PC board is able to produce the PWM (Pulse
Width Modulated) gate signal needed to control the IGBTs (Insulated Gate Bipolar
Transistor) on the chopper module. This test will also verify that the control PC board can
turn the PWM gate signal on and off properly.
MATERIALS NEEDED
Digital Multi-meter
Frequency counter, or digital Multi-meter with frequency counter function
Wiring Diagram
Control Inner-Connection diagram
WELD CONTROL BOARD PWM GATE SIGNAL TESTWARNING
TROUBLESHOOTING & REPAIR
F-69 F-69
VANTAGE® 400
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