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 TM 55-1905-242-14
0005 00
Propulsion Engine-Driven Alternators
When the propulsion engines are running, 24 Vdc power is available from the propulsion engine-driven alternators. Each
propulsion engine has one alternator rated at 110 amps maximum output. Because the propulsion engines are started
hydraulically, the full output of these alternators is available for vessel service loads. When the propulsion engines are
running, and 220 Vac power is available, 24 Vdc power is supplied by both the propulsion engine-driven alternators and by
the battery charger.
24 Vdc Battery Bank
Under unusual conditions, 24 Vdc power is supplied by two dedicated battery banks located in the starboard wing wall
outboard of the accommodation module entry ladder. Each battery bank consists of two 12 Vdc, 8D batteries connected in
series to supply 24 Vdc power. These battery banks provide power to the vessel's 24 Vdc electrical systems under the
following conditions:
1.
When the propulsion diesel engines are secured (no engine-driven alternator output) and no 220 Vac power supply is
available (no battery charger output).
2.
When system load temporarily exceeds the capacity of the battery charger and/or engine-driven alternators.
12 Vdc Battery
A single 12 Vdc battery supplies power to the starting and operating systems of the diesel generator. This battery is
recharged by a generator engine-driven alternator.
Generator Engine-Driven Alternator
A single 12 Vdc alternator is mounted on the diesel generator. This alternator supplies power to charge the generator
engine's 12 Vdc starting battery and to operate the generator's systems and accessories while the generator is operating.
ELECTRICAL DISTRIBUTION COMPONENTS--ALTERNATING CURRENT AND DIRECT CURRENT
All of the LCM-8 Mod 2's electrical systems contain one or more of the following components.
Circuit Breakers
Circuit breakers provide protection against overload on electrical circuits. When the load on a circuit exceeds the circuit
breaker's rating, the circuit breaker "trips," causing an interruption of service for that circuit. This interruption of service
ceases all electrical flow in the circuit and prevents fire or other damage associated with an overload condition. All of the
circuit breakers on the LCM-8 Mod 2 are manual-resetting, meaning that the circuit breaker remains in the "tripped" condi-
tion until it is manually reset. Circuit breakers may also be used both to secure electrical circuits for service and during normal
operation.
Fuses
Fuses provide protection against overload on electrical circuits. When the load on a circuit exceeds the fuse's rating, the fuse
"blows," causing an interruption of service for that circuit. This interruption of service ceases all electrical flow in the circuit
and prevents fire or other damage associated with an overload condition. Once a fuse "blows," it must be replaced before
the flow can be restored to the circuit. A fuse may also be removed to secure an electrical circuit for service.
Switches
Many of the LCM-8 Mod 2's electrical systems are controlled by switches. When in the closed, or ON, position, the switch
permits current to flow in the circuit, activating the switched device. When the switch is in the open, or OFF, position, the
switch interrupts current flow in the circuit, deactivating the switched device.
Distribution Box
Distribution boxes are located throughout the vessel. The distribution boxes house the circuit breakers and fuses that
control and protect the circuits throughout the vessel.
END OF WORK PACKAGE
0005 00-2
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