Lincoln Electric RED-D-ARC DX450 Service Manual page 53

F-9
Observe Safety Guidelines detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
The machine welds but it will not
maintain a steady output.
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely,
contact the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed.
Call 1-888-935-3877.
TROUBLESHOOTING AND REPAIR
POSSIBLE AREAS OF
MISADJUSTMENT(S)
OUTPUT PROBLEMS
This condition may be normal in
the Downhill Pipe Mode. The
downhill pipe mode allows the arc
current to increase and decrease
slightly as the arc length changes.
Check that the electrode is of
good quality, dry and free from
contamination. Try using some
Lincoln Electrode, and setting the
machine per Lincoln recommenda-
tion. If shielding gas is used,
check that the gas and gas flow
are correct. Check for damaged,
pinched or leaking gas lines.
Check for proper work, and elec-
trode leads and connections (size,
length, coils, or bad connections).
The machine may not be main-
taining the correct RPM.
See ENGINE MANUAL.
CAUTION
Perform the Engine Control Unit
Test.
If the engine will not maintain the
correct load RPM, the engine
may be in need of service. The
fuel, air, and fuel filters should be
checked.
Check internal cables and leads
that connect the weld winding of
the stator, chopper module and
the shunt, choke and output ter-
minals. See the Wiring
Diagram. Look for damaged
conductors or faulty connections.
DX450
RECOMMENDED
COURSE OF ACTION
F-9