Lincoln Electric Cross Country 300 Service Manual page 18

LINCOLN ELECTRIC
Observe Safety Guidelines
detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
No welding output in any
mode. The auxiliary output is
normal. The engine operates
normally.
The machine has low welding
output and low auxiliary
output.
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.
POSSIBLE AREAS OF
MISADJUSTMENT(S)
OUTPUT PROBLEMS
1. If the correct OCV is present
at the weld output terminals,
check the welding cables,
connectors, work clamp,
electrode holder, etc. for loose
or faulty connections.
2. Check for damaged
conductors or faulty
connections on the heavy
current carrying leads that
connect the output studs to the
chopper module and to the
output rectifier bridge. Also
check the shunt and the choke
assemblies for damage and
faulty connections.
1. The engine RPM may be low.
The brushes may be sticking or
poorly seated or the slip rings
may be dirty.
CAUTION
Cross Country™ 300 Service Manual
TROUBLESHOOTING GUIDE
RECOMMENDED
COURSE OF ACTION
1. Check gate leads 23 and 25
and weld control board power
leads 13 and 14 for loose or
faulty connections. See Wiring
Diagram.
2. Perform the Chopper
Module Function Test
Procedure.
3. Perform the Stator Voltage
Test Procedure.
4. Perform the Stator Short
Circuit And Ground Test
Procedure.
5. Perform the Output Rectifier
Bridge Test Procedure.
6. The weld control board may
be faulty. Perform the Weld
Control Board Voltage Test
Procedure.
7. Perform the Choke Test
Procedure.
8. Perform the Weld Control
Board PWM Gate Signal Test
Procedure.
1. The engine high idle speed
may be low. Full load speed
should be about 1800 RPM.
Inspect and if necessary, service
the brushes and slip rings per
the Brush And Slip Ring Service
Procedure.
2. Perform the Rotor Voltage
Test Procedure.
3. Perform the Stator Voltage
Test Procedure.
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