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 TM 55-1905-223-24-3
WARNING
Disconnect main line circuit breaker to generator, if applicable,
and tag.
(e) Start ship's service generator set and bring it to rated speed (1800 rpm). TM 55-1905-223-10.
NOTE
It is essential that the speed is correct when checking the output
voltage.
(2) Using a multimeter, measure the dc voltage at leads X and XX. The voltage must read between 12.0 to
13.2 volts.
(3) Using a multimeter, check the output from the main stator terminals on the main terminal board (1,
(a) If the voltage is balanced and within 1 percent of nominal, the main windngs and rectifier
i
semiconductors are good and require no further test.
(b) If an unbalance is shown on any phase of more than 1 percent, this indicates that a fault exists in
the main stator windings. Check the main excitation windings (step (5) of this procedure).
NOTE
The balance check should be made again with all external wiring
connections removed to eliminate the possibility of external
shorts.
(c) If the voltage is balanced but reading low when separately excited, this indicates that afault exists
in either the rectifier assembly or one of the excitation windings. Check the rectifier
semiconductors, step (4), and excitation windings, step (5) of this procedure.
NOTE
Ensure the separate battery supply is between 12.0 and 13.2
volts and the speed is 1800 rpm.
3-19
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