Auxiliarmy Machinerry Lubricating Oil Low-Pressure Alarm System (CKT 2EC)

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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