Lincoln Electric VANTAGE 400 Service Manual page 92

F-44
SLIP RINGS
TEST PROCEDURE
1. Perform the Case Cover Removal procedure.
2. Connect the voltmeter probes to the brush ter-
minals. See Figure F.10. See the wiring dia-
gram.
3. Set the RUN/STOP switch to "RUN" and the
IDLE switch to "HIGH". Start the engine and
allow the RPM to stabilize for about 15 to 30
seconds.
The meter should read 145 to 175 VDC.
4. Set the RUN/STOP switch to "STOP"
5. If the meter reading is normal, this test is com-
plete.
6. If the voltage measures zero or very near zero,
the rotor flashing circuit may be faulty or the
rotor may be shorted.
7. Perform the Rotor Resistance and Ground
Test and the Flashing Voltage Test.
TROUBLESHOOTING & REPAIR
ROTOR VOLTAGE TEST (CONTINUED)
FIGURE F.10 - LEAD LOCATIONS
VANTAGE® 400
BRUSHES
#201
8. If voltage is higher than 175 VDC, the engine
RPM may be too high, or there may be voltage
intrusion from one of the higher voltage stator
windings to the stator exciter winding. Perform
the Engine Throttle Adjustment Test, and
the Stator Short Circuit and Ground Test.
9. If the voltage is lower than 145, but higher
than 120, the engine RPM may be too low, or
there may be problems in the windings or other
exciter circuit components or connections.
Perform the Engine Throttle Adjustment
Test, and then perform the testing described
below, under the heading "If the voltage mea-
sures about 3 to 5 VDC"
F-44
#200A
#200B