Steering Emergency Alarm System (CKT LB)

indicating system can be found in the Propulsion

indicators and a bell in the auxiliary control console

Control System Technical Manual.

are energized.

The pressure at the starting air manifold is

GAS TURBINE LUBRICATING OIL

continuously displayed on an analog indicator on the

HIGH-TEMPERATURE ALARM

auxiliary control console with a 0 to 150 psig range.

SYSTEM (CKT EP)

Each HP and LP compressor is fitted with a safety

Circuit EP provides a means for indicating high

shutdown feature that closes a contact in its motor

temperature for the lubricating oil supply to the gas

controller. This contact, in turn, energizes circuits in

turbine. This system is classified as semivital

the auxiliary control console to display a visual alarm

readiness class 1.

and sound a horn.

A signal, taken from circuit TM (temperature

In addition to the alarms on the auxiliary control

indicating and alarm system), is used as an input to an

console associated with the air receiver pressures,

alarm control module at the local operating station

there is a pressure switch fitted in the piping for each

when the lubricating oil reaches a predetermined

HP and LP air receiver. Alarm modules on the IC/SM

temperature. An alarm signal is generated and

switchboards in auxiliary machinery rooms No. 2 and

transmitted from the local operating station to the

No. 3 actuated by these pressure switches are used to

PCC, where it energizes visual and audible alarm

indicate a low-pressure condition at any of the HP or

indicators.

LP air receivers. Alarms for HP and LP receiver No.

Checkout procedures for this circuit can be found

1 appear on alarm switchboard No. 2 in auxiliary

in the Propulsion Control System Technical Manual.

machinery room No. 2. Alarms for HP and LP air

receivers No. 2 appear on alarm switchboard No. 4 in

Power supply for this circuit is taken from the

auxiliary machinery room No. 3.

PCC.

The engine turbocharger pressures are displayed

STEERING EMERGENCY ALARM

on the digital demand display at the electric plant

SYSTEM (CKT LB)

control console.

Low-pressured conditions, at the brake actuator

Circuit LB provides a means of signaling that a

and at the turbine brake actuator, operate pressure-

steering casualty has occurred. This system is

sensitive switches, which transmit signals to alarm

classified as vital readiness class 2.

indicators at the PCC.

In the event of a casualty to the steering control

Transducer-controlled signals drive pressure

system, the operator at the SCC operates the steering

meter displays at the local operating station for gas

alarm switch on the console. One pole of this switch

turbine starting air pressure. Alarm signals, taken from

closes the circuit to the siren in the steering gear room.

the meter circuitry, are transmitted to the PCC for

A plate installed at the siren reads "WHEN THIS

SIREN SOUNDS, AFTER STEERING STATION

energizing alarm indicators at the PCC.

TAKE CONTROL." The second pole of the switch on

The PCC computer calculates gas generator

the SCC is bridged with a supervisory resistor and is

pressure ratios. The output signal is displayed on a

connected to an alarm module of the alarm

console meter and is transmitted to the local operating

switchboard in the machinery control area of CCS.

station instrument panel for display on a second meter.

Thus, operation of the switch alerts CCS of the

steering control casualty.

System checkout procedures for the HP and LP air

indicating and alarm circuits can be found in the

System checkout can be performed by operation

Auxiliary Control Console Technical Manual. The

of the switch on the SCC. Circuit checkout of the

alarm circuitry may be verified with its test circuit as

signal in CCS is available at the alarm switchboard.

described in the appropriate PMS cards. Checkout

procedures for the engine turbocharger indicating

POWER FAILURE ALARM

system can be found in the Electric Plant Control

SYSTEM (CKT PF)

Console Technical Manual. Checkout procedures for

the actuator alarm systems, the low starting air

Circuit PF provides an indication to a remote

station when power input to the main IC switchboard

pressure alarms, and the gas generator pressure ratio

9-28