E-3
TROUBLESHOOTING
E-3
INVERTEC STT II
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your
Local Lincoln Authorized Field Service Facility
for technical troubleshooting assistance before you proceed.
CAUTION
Observe Safety Guidelines detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
No output. Main fuses open, indicat-
ing excessive current draw.
Machine loses output when gun trig-
ger is pulled or arc is struck.
Machine output returns after a few
seconds and trigger is pulled again.
The Thermal indicator light is lit.
Machine is dead - no output -no
fans - no display.
POSSIBLE AREAS OF
MISADJUSTMENT(S)
1.
With input power removed
inspect input leads for possible
shorts or grounds or misconnec-
tions.
2. Install new fuses and reapply
power. If fuses open again con-
tact your local Lincoln Authorized
Field Service Facility.
1. The over current sensor is being
activated indicating that too much
output current is being drawn
from the machine. Reduce weld-
ing current demands or remove
“fault” in welding cables.
2. Make sure that the gun tip is not
“shorted” to the work surface and
that the proper welding proce-
dures are being used.
1. Power switch must be in the
“ON” position.
2. Check the input voltage. Make
sure all three phases are applied
to the machine.
3. With input power removed check
that the input voltage set-up
switch and jumper “A” ( the
reconnect auxiliary jumper) are in
the proper position for input volt-
age being used. See Reconnect
Procedure in the Installation
Section.
4. With input power removed check
continuity of 3 amp slow blow
fuse located on reconnect panel.
RECOMMENDED
COURSE OF ACTION
If all recommended possible areas
of misadjustment have been
checked and the problem persists,
Contact your local Lincoln
Authorized Field Service
Facility.
OUTPUT PROBLEMS
Summary of Contents for INVERTEC STT II Series
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