Lincoln Electric INVERTEC V275-S Service Manual page 36

F-6
Observe Safety Guidelines
detailed in the beginning of this manual.
OUTPUT PROBLEMS
(SYMPTOMS)
The V275-S will not produce full
output.
The machine's welding output is
very high and uncontrollable.
If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con-
tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call
1-888-935-3877.
TROUBLESHOOTING & REPAIR
POSSIBLE AREAS OF
MISADJUSTMENT(S)
OUTPUT PROBLEMS
1. The input voltage may be too
low, limiting the output capabil-
ity of the machine. Make cer-
tain the input voltage is correct
for the machine and the recon-
nect switch and jumper lead
configuration.
2. The welding current may be too
high. The machine will fold
back to less than 200 amps if
the welding current exceeds
300 amps.
3. Make sure the machine is in
"Local" output control.
problem is resolved the remote
control device or associated
machine circuitry may be faulty.
1. Put the Local/Remote switch in
the Local position. If the prob-
lem is solved the remote con-
trol device or associated cir-
cuitry may be faulty.
CAUTION
V275-S
TROUBLESHOOTING GUIDE
RECOMMENDED
COURSE OF ACTION
1. Perform the Output Module
Test.
2. Perform the Main Switch
Board Test.
3. Perform the Output Current
Shunt Test.
4. The output Control potentiome-
ter (R1) may be faulty Normal
value is 10,000 ohms.
check associated wiring for
loose or faulty connections.
If the See wiring diagram.
5. The control board may be faulty.
Perform the Control Board
Test.
1. Perform the Output Current
Shunt Test.
2. The output control potentiome-
ter or associated leads may be
faulty. See the wiring diagram.
3. The Control Board may be
faulty. Perform Control Board
Test.
F-6
Also