Weld Control Feedback Test - Lincoln Electric RED-D-ARC DX450 Service Manual

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Service and repair should only be performed 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 will determine if the weld control PC board is receiving accurate current and volt-
age feedback from the weld circuit.
This test will only yield usable information if the machine is producing some weld output.
MATERIALS NEEDED
Digital Multi-meter suitable for accurate readings in both the millivolt and normal
Weld voltage ranges.
Resistive load bank
Ammeter, suitable for accurate readings of normal welding current. (Often built into
the load bank)
Wiring Diagram
TROUBLESHOOTING AND REPAIR

WELD CONTROL FEEDBACK TEST

WARNING
DX450
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