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 (f) To secure one generator form parallel
generator no. 2 (1) by turning handle left to CLOSED
operation, proceed as follows:
position. Turn handle to the right to TRIP position for an
1. Check ammeters (14 and 41) to see
open circuit.
that loads of both generators are equal. Adjust with
NOTE
rheostat to obtain an equal load if necessary.
The disconnect switches below are
2. Open generator equalizer switch
large knife type blades and operate
(39).
stiffly.
Be sure you use enough
3. Remove load from the generator to
pressure
to
completely
operate
be secured by turning rheostat clockwise slowly until
switches.
generator being left on line indicates that it is carrying
(b) Open or close the generator disconnect
75 percent of the load. Turn circuit breaker handle to
switches (16 and 38) by pulling handle away from panel
TRIP position.
for OFF, or push toward panel for ON.
4. Adjust voltage to 115 volts.
(c) The electrical distribution switches (18
5. Open generator disconnect switch
through 37) close the circuit when moved right to ON,
(16 or 38) of the generator to be secured.
and open the circuit when moved left to OFF.
6. Secure auxiliary set (para. 2-11d).
CAUTION
(g) To shift the electrical load to shore
Do not close a switch that has been
power, proceed as follows:
tripped by an overload until the cause
1. Check that the shore power supply
of the overload has been determined
switch (37) is in the OFF position.
and the defect corrected.
2. Connect the shore power supply
(d) Connect a generator to the control panel
cable to a source of 120 volt dc, then plug cable into the
as follows:
receptacle on after deckhouse. Energize the source.
1. Start an auxiliary set (para 2-11b).
3. Check that shore power indicator
2. Assure that generator disconnect
light (7) is illuminated.
switches (16 and 38) and generator circuit breakers (1
4. Place voltmeter selector switch (10)
and 12) are in the OPEN position. Place voltmeter
in SHORE POWER position.
selection switch (10) in position to read voltage of the
5. Close shore supply switch (37) and
generator to be started.
check voltmeter (10). Meter should read 120 volts. If
3. Adjust voltage to 115 volts with
meter needle is deflected to left (below zero), polarity is
generator rheostat.
reversed. Correct by reversing cable connection at
4. Close generator disconnect switch
power source.
(16 or 38).
6. When meter reading in step 5 above,
5. Close generator circuit breaker (1 or
is correct, reduce the electrical load on generator as
12).
much as possible by deenergizing all unnecessary
6. Check voltage. Adjust to 115 volts.
electrical equipment. This is to reduce the amperage
(e) To parallel the generators, with one
load.
generator in operation supplying the electrical system,
7. Quickly move power selector switch
proceed as follows:
(17) from GENERATOR BUS position to SHORE
1. Start the remaining auxiliary set
POWER position.
8. Trip the generator circuit breaker,
2. Select the incoming generator with
open the disconnect switch, and secure the auxiliary set
voltmeter selector switch (10) and the operating
generator with selector switch (42).
(h) To shift from shore power to generator
3. Adjust voltage of incoming generator
power, proceed as follows:
to a value of 2 volts higher than the operating generator;
1. Start an auxiliary set (para. 2-11b).
i.e. if operating generator voltage is 120 volts, adjust
2. Select the generator started on
voltage of incoming generator to 122 volts.
voltmeter selector switch (10).
4. Close generator disconnect switch
3. Adjust generator voltage to 120
(16 or 38) for the incoming generator.
volts.
5. Close generator circuit breaker (1 or
4. Close generator disconnect switch
12) for the incoming generator.
(16 or 38).
6.
Using rheostats (15 and 40),
5. Close generator circuit breaker (1 or
equalize ammeter readings between the generators, and
12).
adjust voltage to 115 volts.
6. Reduce electrical load as much as
NOTE
possible.
Be sure that the power selector switch
7. Quickly move power selector switch
(17) is in the GENERATOR BUS
(17) from SHORE POWER position to GENERATOR
position
when
connecting
the
BUS position.
generator to the control panel.
7. Close generator equalizer switch
(39).
2-45
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