Lincoln Electric INVERTEC V275-S Service Manual page 38

F-8
Observe Safety Guidelines
detailed in the beginning of this manual.
FUNCTION PROBLEMS
(SYMPTOMS)
The main input fuses or breakers
repeatedly fail.
The machine operates normally
when connected for 200-230 VAC
input. There is no output when the
machine is connected to 380VAC
or higher.
The machine's output stays at min-
imum-no control of output.
Open Circuit Voltage is abnormally
high. Normal maximum Open
Circuit Voltage is 70 VDC.
The Mode Selector does not func-
tion properly.
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)
FUNCTION PROBLEMS
1. Make certain the fuses or break-
ers are properly sized for the
input draw of the machine.
2. Make sure the reconnect switch
and jumper leads are configured
correctly for the applied input
voltage.
3. The welding procedure may be
drawing too much input current
or the duty cycle may be too
high. Reduce the welding cur-
rent and/or reduce the duty
cycle.
1. Check the input voltage and
input voltage reconnect proce-
dures. See the Installation
Section.
1. Make sure the machine is in the
The Local position. If the problem is
solved the
device may be defective.
1. Refer to the Operation Section
of this manual for normal opera-
tion characteristics.
CAUTION
V275-S
TROUBLESHOOTING GUIDE
RECOMMENDED
COURSE OF ACTION
1. Check the reconnect switches
and associated wiring for loose
or faulty connections. See the
wiring diagram.
2. Perform the Input Rectifier
Test.
3. Perform the Main Switch
Board Test.
4. Perform the Output Diode
Module Test.
5. The input filter capacitors may
be faulty. Check, and if either is
faulty replace both.
1. Perform the Capacitor
Balance Test.
2. Perform the Main Switch
Board Test.
3. Perform the Auxiliary
Transformer Test.
1. Perform the Output Current
Shunt Test.
remote control
2. Check for loose or faulty con-
nections between the output
potentiometer and the control
board. See the wiring diagram.
1. Check for loose or faulty con-
nections between the Mode
Selector Switch and the control
board. See the wiring diagram.
2. The Mode Selector Switch may
be faulty.
3. The control board may be faulty.
F-8