Figure 4-45.--Control power supply.

BATTERY SET

cabinet. It is secured to the cabinet with quick-release

fasteners. The control indicator contains all the operator

controls and indicators for the gyrocompass set. The

The battery set is installed in the electrical

control indicator also contains built-in test equipment

equipment cabinet (fig. 4-43). It is secured in the cabinet

(BITE) for the major assemblies and subassemblies.

by quick-release fasteners. The battery set consists of a

BITE circuits identify equipment faults and provide

battery, isolation diodes, fuses, and sensing circuits. The

visual indications of the faulty assembly or

battery consists of 60 sealed lead-acid storage cells.

subassembly.

They are connected in series-parallel, five parallel

branches, consisting of 12 cells per branch, to provide a

nominal 24-volt output for approximately 30 minutes

CONTROL POWER SUPPLY

during normal power failure. The battery set weighs 70

lbs and requires careful handling by two persons when

The control power supply (fig. 4-45) contains the

moved. The battery is under a continuous charge,

control, computing, processing, analog/digital

provided by electronics in the control power supply. The

conversion, input/output interface, and power supply

fuses provide overload protection in the battery charger

electronics for the gyrocompass set. The control power

input circuit and the battery output. The sensing circuits

supply also contains capacitor assemblies, cooling

consist of a high-voltage sensing circuit, a low-voltage

blowers, BITE, and the battery charging electronics for

sensing circuit, and a temperature sensing circuit. The

charging the battery set.

output of these sensing circuits go to BITE circuits in

Figure 4-45.--Control power supply.

4-47