TM 55-1930-209-14&P-1
3-7.5.1 Correcting reverse power situation. If reverse power situation develops, reverse power indicator light for that
generator comes on and a safety relay immediately shuts down that generator. a Immediately go through shutdown
procedures, paragraph 3-17, for generator set that has been shut down by safety relay.
b.
Allow loaded generator about 10 seconds to stabilize.
c.
Adjust generator voltage to 450 V, if necessary, by using AUTOMATIC VOLTAGE CONTROL RHEOSTAT control
(Figure 3-11).
d.
Adjust generator frequency to 60 Hz, if necessary, by using GOVERNOR SPEED CONTROL switch.
e.
Start the shutdown generator by following procedures in paragraphs 3-7.2 and 3-7.4.
f.
Parallel generators according to paragraph 3-7.5 and try load transfer again.
3-7.6 Operating procedures using shore power. Shore power, if available from an onshore power source or another
vessel, is connected to shore power receptacle on aft weatherdeck bulkhead portside.
a.
Verify that shore power is 440 Vac, 60 Hz, 3 ph. If power does not match this requirement, switchboard circuit
breaker P4 (Figure 3-15), connecting shore power to switchboard bus, will not dose.
b.
Verify that all loading circuit breakers (Figure 3-12 or 3-13) on switchboard are open (OFF). Electrically, a dead
ship condition must exist prior to engaging shore power circuit breaker.
c.
Verify that switchboard circuit breakers for generators (P1 for SSG 1, P2 for SSG 2, and P3 for SAG) (Figure 3-
14) are open (OFF).
d.
On switchboard panel, dose (ON) circuit breaker P4 (Figure 3-15).
e.
Apply load as required by dosing circuit breakers on switchboard panel.
3-7.7 Operating other electrical panels and controls. Electrical panels and controls, other than those on the
switchboard, are self-explanatory and labels show their function. Instructions on when to use these controls are included
in chapters covering the affected systems.
CAUTION
Circuit breakers on electrical panels should not be used as switches. All electrical
devices onboard have switches, control boxes, and/or starters that provide normal
control. Circuit breakers should be used only when safety requirements dictate
that a circuit be totally Inactive or when that system is being placed in storage.
3-7.8 Normal shutdown procedures from switchboard. Procedures for shutting down these generator sets from the
engine locations are in paragraphs 3-19.6.1 for SSG's and 3-25.5.1 for SAG.
a.
Offload generator either by paralleling and transferring load to another generator or by opening all switchboard
circuit breakers. When this has been completed, check that generator has stabilized.
b.
Open (OFF) appropriate switchboard circuit breaker (Figure 3-14) connecting that generator to switchboard bus:
P1 for SSG 1
P2 for SSG 2
P3 for SAG
c.
Turn VOLTAGE REGULATOR IDLE/RUN switch (Figure 3-11) to IDLE.
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