Weld Control Feedback Test Procedure - Lincoln Electric Cross Country 300 Service Manual

LINCOLN ELECTRIC
WELD CONTROL FEEDBACK TEST 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 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 troubleshooting 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 voltage feedback
from the Weld Circuit. This test will only yield usable information if the machine is producing some weld
output.
MATERIALS NEEDED
Digital Multimeter 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
TEST PROCEDURE
1. Set the 'Stop / (Auto Idle/Run) / (High Idle/Run)' switch in the "High Idle/Run" position. See Figure
F.25.
2. Place the weld mode selector switch in the "CC-STICK" position. See Figure F.25.
3. Make sure that nothing is plugged into the Amphenol receptacle.
4. Connect the resistive load bank and the ammeter to the weld output terminals per the equipment
manufacturer's instructions; also connect the voltmeter probes across the weld output terminals.
See Figure F.25.
NOTE: If the optional Weld Meter Kit is not installed, proceed to step 9.
5. Start the machine and apply a load of about 200 amps, as shown on the external ammeter. If the
machine will not produce 200 amps, apply as much load as you can.
6. Compare the readings shown on the external ammeter and voltmeter to the amps and volts
displayed on the front panel of the machine.
7. If the readings shown on the front panel displays are about the same or very close to the reading on
the external meters, the feedback is probably good, and this test is complete.
8. If the readings differ significantly, continue with this procedure.
9. Remove the load from the weld terminals and turn off the engine. (The load bank and ammeter can
remain connected.)
10. Perform the Case Cover Removal Procedure.
Cross Country™ 300 Service Manual
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