Monitoring System

TM 55-1915-200-10

contains three each throttle and direction control valves

equipment. Conditions monitored include: lubrication

for propulsion engine and bow thruster engine on the

oil, exhaust gas and water jacket temperature;

ERC and PHC. The ERC contains a pilot-air valve for

lubrication oil, fuel oil, starting air, and cooling water

ERC control of the system or transfer of control air to

pressure; expansion tank water and fuel oil level; engine

the PHC. The PHC contains a pushbutton valve for

overspeed; high bilge level in several locations; system

control air at the PHC.

power status; and related conditions.

The basic

elements of the alarm system are remote sensor

1-10.6.4. Monitoring System. The monitoring system

elements and ERC alarm cards. The alarm cards

monitor sensor elements and activate visual indicators

enables operators at the ERC and PHC to monitor

and audible alarm devices when an alarm condition is

propulsion machinery without several persons constantly

detected. The alarm system also contains an inhibit

observing machinery conditions. The system consists of

circuit to prevent nuisance alarms from occurring when

the pressure monitoring system, the temperature

machinery is intentionally shut down. A pushbutton

monitoring system and the engine exhaust monitoring

feature is provided to test the indicators and alarm

system.

circuitry without interrupting monitoring functions.

1-10.6.4.1. Pressure Monitoring System. The pressure

1-10.6.6. Engine Automatic Shutdown System. The

monitoring system provides the ERC operator with the

means of observing machinery pressure on direct

main engine automatic shutdown system provides for

reading gauges from a single location.

automatic shutdown of the propulsion engine in the

event of a vital malfunction which if allowed to continue,

would cause extensive damage to the engine. Alarms

1-10.6.4.2. Temperature Monitoring System.

The

monitor main engine low lubricating oil pressure and

temperature monitoring system (pyrometers) allows the

main engine reduction gear low lubricating oil pressure.

ERC operator to observe machinery temperature on

When either of these alarms is activated, the ERC

direct reading gauges from a single location. The

operator may override the automatic shutdown system.

system consists of resistive temperature detectors

Since the engine does not develop lubrication oil

mounted on the machinery and signal condition panels

pressure while not running, and the reduction gear also

mounted in the pyrometer panel. The temperature

does not develop lubrication oil pressure when the

detectors transmit a voltage representative of

propulsion shaft is not turning, each must be overridden

temperature.

The signal conditioners convert the

during starting. The main engine low lubrication oil

voltage to a temperature reading for display on the

pressure switch is overridden by an engine speed switch

meters.

until main engine attains operating speed. The main

engines are manually shut down through the automatic

1-10.6.4.3. Engine Exhaust Temperature System. The

shutdown circuitry by controls on the ERC. This action

engine exhaust temperature system (pyrometers)

will cause the main engine governor to cease supplying

displays main engine cylinder exhaust temperatures.

fuel to the engine, and automatic shutdown occurs.

Thermocouplers mounted in the engine exhaust ports

transmit a temperature to pyrometers contained on the

1-10.6.7. Engine Order Telegraph (EOT) System. The

console.

EOT system communicates the desired propeller shaft

1-10.6.5. Alarm System. The alarm system informs the

speed and direction for each from the PHC to the

operator of a malfunction of monitored engine room

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