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POSITIVE
SLIP RING
NEGATIVE
SLIP RING
BRUSH HOLDER ASSEMBL
Y
BRUSHES
VOLTMETER LEADS
FIGURE F.7 – EXCITER ROTOR VOLTAGE TEST
EXCITER ROTOR VOLTAGE TEST (continued)
PROCEDURE (continued)
5. Connect the volt meter probes to the brush termi-
nals. See the wiring diagram and Figure F.7
NOTE: On this machine, and all other Lincoln Electric
DC generator machines, the black exciter lead
is positive, and the red lead is negative.
6. Set the RUN/STOP switch to “RUN” and the IDLE
switch to “HIGH”. Do not start the engine at this
time.
7. Within 30 seconds of switching the run/stop switch
to the run position, read the “flashing” voltage
across the brush connections. The meter should
read approximately 2 to 4 VDC. (Check this voltage)
If this voltage reading is correct, start the engine and
continue the testing.
If this voltage is not within these limits, perform the
Flashing Voltage Tests.
NOTE: If more than 30 seconds (One minute for some
models) has passed, the engine fault lamp will
turn on and the fuel solenoid and flashing volt-
age will be turned off. Before the engine can
be started, the engine protection system will
need to be reset by switching the run/stop
switch off, then on again.
8. Start the engine and allow the RPM to stabilize for
about 15 to 30 seconds.
The meter should read 124 to 132 VDC*.
(continued on following page)
TROUBLESHOOTING AND REPAIR
F-31 F-31
SAE-400 SEVERE DUTY
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