Lincoln Electric RED-D-ARC DX450 Service Manual page 50

F-6
Observe Safety Guidelines detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
No output in PIPE MODE.
Outputs normal in other modes.
VRD lights donʼt light up.
No auxiliary power at one or more
receptacles or at the 14 pin
Amphenol.
Weld output is normal and the
engine operates normally.
The machine has low welding out-
put and low auxiliary 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
Make sure VRD ON/OFF toggle
switch is in the off position.
Faulty VRD display board.
Ensure VRD ON/OFF switch is in
the "ON" position.
VRD light may be burned out,
replace both VRD lights.
Faulty VRD display P.C. Board.
Check for loose or faulty connec-
tions at the output receptacles or
14 pin amphenol.
Check for tripped circuit breaker
and/or tripped GFCI receptacles.
The engine RPM may be low.
The brushes may be sticking,
poorly seated or slip rings dirty.
CAUTION
Check the connections at the VRD
ON/OFF switch.
Check the VRD on off switch for
proper function/continuity.
See VRD functional description.
Perform the Control
Potentiometer and Mode Switch
Resistance Test.
The control board may be faulty.
Check connections at the VRD
ON/OFF switch.
Check the VRD on off switch for
proper operation.
See VRD functional description.
Perform the Stator Voltage Test.
Check the wiring between the
auxiliary receptacle and the main
stator.
See the Wiring Diagram.
The engine high idle speed may
be low. Perform the Engine
Full load speed should be about
Control Unit Test.
1810 RPM. Inspect and if neces-
sary service the brushed and slip
rings per the Brush and Slip
Perform the Rotor Voltage Test.
Ring Service.
Perform the Stator Voltage Test.
DX450
RECOMMENDED
COURSE OF ACTION
F-6