Lincoln Electric VANTAGE SVM178-B Service Manual page 194

F-6
Observe Safety Guidelines detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
The machine has welding output
but no control of output. The auxil-
iary power is normal.
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
1. If a remote control unit is con-
nected to the machine, check
the remote control and related
cable.
2. Check the welding and work
cables for loose or faulty con-
nections.
1. Check the brushes for wear and
proper contact to the slip rings.
2. The engine RPM may be low.
CAUTION
VANTAGE® 500
RECOMMENDED
COURSE OF ACTION
1. Check the OUTPUT control
potentiometer and
leads. See the
Diagram.
2. Check the shunt and associat-
ed feedback leads.
Wiring Diagram.
3. Check the voltage feedback
leads for loose or faulty con-
nections. See the Wiring
Diagram.
4. Perform the Chopper Module
Test.
5. The Weld Control PC board
may be faulty.
6. Pull coil board may be faulty.
Except tier II Cummins code
11181.
1. If the engine high idle speed is
low, perform the Throttle Ad -
justment Test.
2. Perform the Rotor Resistance
Test.
3. Perform the Flashing and
Rotor Voltage Test. If the rotor
voltage is low, the field capaci-
tor or field bridge may be faulty.
Test and replace if necessary.
See the Wiring Diagram.
4. If the engine high idle RPM is
OK, then the engine may have
lost horsepower and be in need
of major repair.
5. Tier II Cummins - See EGC test
and adjustment.
F-6
related
Wiring
See the