Lincoln Electric RED-D-ARC DX450 Service Manual page 65

F-21
Observe Safety Guidelines detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
The arc quality is poor with exces-
sive spatter. The arc heat can be
controlled and maintained normal-
ly, the auxiliary output is normal
and the engine operates normally.
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)
WELDING PROBLEMS
The Arc Control may be set too
high.
The output control may be set too
high for the electrode being used.
Check that the electrode is of
good quality, dry and free from
contamination. Try using some
Lincoln Electrode, and setting the
machine per Lincolnʼs recommen-
dation.
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).
CAUTION
Check that the weld circuit isn't
grounded. With the engine off,
check the resistance between
chassis ground and the weld out-
put terminals. The resistance
should be very high, a minimum of
500,000 (500k) Ohms.
The weld control system may be
grounded or malfunctioning.
Perform the Control
Potentiometer and Mode Switch
Test, and the Remote Receptacle
Resistance Test.
The Chopper module may be
defective. Perform the Chopper
Module Resistance Test.
DX450
F-21
RECOMMENDED
COURSE OF ACTION