Security Alarm System (CKT FE)

Under normal operating conditions, the sensor

has failed. This circuit is classified as semivital

readiness class 1.

detects the airflow by rotation of its vanes. An

interruption of contacts as the vanes turn produces the

One 400-Hz and one 60-Hz relay is provided as

pulses that operate the meter.

integral units of the main IC switchboard. Two

modules on the IC/SM alarm switchboard in the

The indicator is an electronic signal unit type

machinery control area of CCS function in this alarm

IC/E102, a modification of the IC/EIDI. It serves as

circuit.

the alarm portion of the system and can be used with

remote alarm units. A 12-volt battery inside the

Each of the relays on the main IC switchboard is

enclosure supplies power to the entire unit during

normally held energized by the bus voltage. Failure of

normal and emergency operations.

the bus voltage permits the relay to assume the normal

(de-energized) position, shorting the supervisory

resistor by closing the alarm contacts to the associated

SYSTEMS MAINTENANCE

module in the type IC/SM alarm switchboard in the

machinery control area of CCS. Operation of the bus

Preventive maintenance of the systems should be

failure alarm signal at the main IC switchboard is also

done according to the MRCs associated with each

controlled by two bus relays and is described in the

system. Preventive maintenance consists of routine

technical manual for the switchboards.

cleaning, visual inspection of components, and testing.

Corrective maintenance of the systems is relatively

SECURITY ALARM SYSTEM (CKT FZ)

easy to perform. Almost any trouble that will affect

system operation gives an audible and/or visual

The purpose and use of the security alarm system

indication.

is confidential. During normal ship operations, testing

and maintenance of the system and its monitored areas

If an open occurs in one of the systems, an alarm

should follow the two-man rule; that is, a minimum of

condition cannot be detected. Therefore, the problem

two authorized personnel capable of detecting

should be found and corrected as soon as possible, In

incorrect or unauthorized procedures with respect to

some cases, such as open supervisory relay contacts, no

the task to be performed and familiar with applicable

indication will be received to indicate a trouble

safety and security procedures must be present. All

condition.

keys to the switchboard door locks, terminal box

Shorted switch contacts or relay contacts in one of

padlocks, and so on, are to be handled as SECRET

the systems could result in false alarm conditions or

material, and should remain in the possession of

blown fuses. A short in an audible or visual signal will

designated ship's security personnel. If either a lock

affect the operation of the system only during an alarm

or its key is lost, both must be replaced immediately.

condition. The short will cause an increase in current

Refer to NAVSHIPS 401-4538943, Security

flow and will result in blown fuses.

Alarm System Circuit FZ Elementary and Isometric

Wiring Diagram (CONFIDENTIAL), for equipment

A ground in one of the systems could also result in

description, operation, and location. Because of the

false alarms or blown fuses. Grounds can be either

confidentiality involved, you will have to refer to the

single or multiple on the same side of the line or

NAVSHIPS 401-4538943 and applicable PMS cards

simultaneous on both sides of the line.

for procedures to troubleshoot and repair the system,

Mechanical problems, such as a weak spring on art

alarm relay, will also result in a false alarm.

AIR FLOW INDICATOR AND ALARM

PANEL (TYPE IC/APE)

If a complete loss of power occurs in an alarm panel,

check the fuses that supply primary power to the panel.

If the fuses are good, open the panel and check the

The airflow indicator and alarm panel (circuit HO)

incoming line connections with a voltmeter. If power is

is a remote panel installed in each compartment that

not present, the problem is in the cable that supplies

needs a constant supply of fresh air, The meter can

power to the panel. If power is present, check the power

indicate a flow of air not exceeding 1000 feet per minute

transformer and rectifier. For more information on

(fpm). An alarm sounds when the airflow from the

troubleshooting alarm panels, refer to the applicable

exhaust ventilation decreases to a predetermined level,

which is set by a second pointer on the meter face.

manufacturer's technical manual.

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