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OUTPUT PROBLEMS
Observe Safety Guidelines detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
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.
CAUTION
TROUBLESHOOTING AND REPAIR
F-7 F-7
INVERTEC® V450-PRO
Thermal light is ON. The
machine regularly “overheats.”
1. The welding application may
be exceeding the
recommended duty cycle
and/or limits of the machine.
2. Dirt and dust may have
clogged the cooling channels
inside the machine. Refer to
the Maintenance Section of
this manual.
3. Air intake and exhaust louvers
may be blocked due to
inadequate clearance around
the machine. Check the upper
section of the machine and
AC/DC switch lower section
intakes.
4. Make sure the fan is
functioning correctly. Machines
are equipped with F.A.N. (fan
as needed) circuitry. The fans
run whenever the output is
enabled and will continue
running for a period of time
(approximately 5 minutes) after
the output is disabled.
1. One of the thermostats may
be faulty. Also check
associated wiring for loose or
faulty connections. See the
Wiring Diagram or the
Machine Diagram in Section
G. There are a total of 2
thermostats in the system.
2. Temporarily jumper out the
thermostat circuit at the
Control Board. See the
Machine Diagram in this
manual to jump this circuit
function for test only. If the
machine does not reset, the
Control Board is defective. If
it does reset, perform the
Thermostat Test.
3. Temporarily jump around the
fan relay contacts to test fan
relay function. See the
Machine Diagram in Section
G to test the fan relay
function.
CAUTION
: 120VAC is used
to run the fan.
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