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Individual extension alarms are provided via the
The transducer signal, representing reduction gear
supplemental relay of circuit F to the damage control
bearing lubricating oil pressure, is transmitted to drive
pressure meters at the local operating station and at the
console and common extension alarms to the alarm
console. The associated pressure switch closes when
switchboard at the offtcer of the deck (OOD) station
pressure drops to its low limit, and transmits a signal
and to the alarm switchboard in the ship control
to alarm indicators at the local operating station and
console.
at the console. In addition, when the pressure is
Circuitry of the alarm switchboards and asso-
established, it transmits a signal to a console GEAR
ciated connections may be verified by means of
LUBE OIL ON indicator.
switchboard test procedures.
The transducer signal, representing lubricating oil
Power for each alarm circuit is provided from the
pump discharge pressure, is routed directly to the
alarm switchboard.
console where it is used as a demand digital checkout.
System checkout procedures for the lubricating oil
PROPULSION MACHINERY
pressure circuits can be found in the Propulsion
LUBRICATING OIL LOW-PRESSURE
Control System Technical Manual.
ALARM SYSTEM (CKT 1EC)
Power for the lubricating oil pressure circuits is
Circuit 1EC provides a means of indicating low
taken from the PCC.
oil pressure in the lubricating oil supply lines to the
propulsion engines, reduction gear bearings, and
AUXILIARY MACHINERY LUBRICATING
associated equipment. This system is classified as
OIL LOW-PRESSURE ALARM SYSTEM
semivital readiness class 2.
(CKT 2EC)
Pressure transducers of the pressure-to-current
type are provided in the lubricating oil supply lines,
Circuit 2EC is a semivital readiness class 1 circuit.
This circuit provides a means of indicating low oil
the lubricating oil scavenge lines, the reduction gear
pressure in the lubricating oil lines to bearings of the
bearing circuit, and the lubricating oil pump discharge
ship's service diesel generators. This is done through
lines. Pressure switches are provided in the coastdown
the use of pressure transducers and pressure-type
circuit and the reduction gear bearing alarm circuit.
switches provided in the lubricating oil lines to the
Each transducer transmits a signal, proportional to
ship's service diesel generators.
the lubricating oil pressure, to a signal conditioner at
A pressure transducer is installed in the
the local operating station for display at the local
lubricating oil supply line to each diesel generator.
operating station, at the PCC, or as a digital readout at
The transducer generates a signal proportional to
the console.
supply line pressure that is applied to the console
Each pressure switch transmits a signal to an alarm
circuitry to drive a pressure meter and to generate an
indicator at the local operating station or at the
alarm signal when pressure drops to a predetermined
console.
low value.
The signal representing lubricating oil supply
A pressure switch is installed in the lubricating oil
pressure is generated at the freestanding electronics
supply line to each diesel generator. Alarm modules
enclosure. Pressure is displayed on meters at the local
on the IC/SM switchboards in each machinery room
operating station and at the console alarm indicator.
are actuated by these pressure switches to indicate a
The transducer signal, representing lubricating oil
low-pressure condition at any of the supply lines.
scavenge pressure, is applied to the demand circuitry
Circuitry of the alarm switchboards and
for a digital readout at the console. Internal circuitry
associated connections may be verified by test
generates both high- and low-pressure alarms at the
procedures previously described.
console.
Checkout procedures for the console alarm circuit
The pressure switch in the coastdown pump air
can be found in the Electric Plant Control Console
supply is actuated when pressure drops to its low limit,
Technical Manual.
and transmits a signal to a console alarm indicator. In
addition, when the pump is operating, it provides a
Power supply for the circuits associated with the
signal to a console pump running indicator.
IC/SM alarm switchboard is from these switchboards.

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