Figure 4-26.--A. Meridian gyro control system. B. Block diagram

On the bottom right-hand corner of the control

the compass system, for a short time, in case of failure

cabinet is a spare type 1 computer amplifier.

of the ship's power supply. Under normal operation the

ac section operates as a 115-volt, 400-Hz, 3-phase

Compass Failure Annunciator

synchronous motor, driving a 120-volt compound-

wound dc genemtor that charges a bank of 20 6-volt

The compass failure annunciator (fig. 4-20) is a remote

storage batteries. If the ship's 400-Hz supply fails, or

visual indicator, of the same type used in the Mk 23 system.

Associated with the annunciator is usually a Navy

falls below 105 volts, the ship's line is disconnected

standard type IC/B5DSF4 alarm bell. The alarm bell and

automatically and the 120-volt dc generator is driven as

annunciator are actuated by the alarm control system to

a motor by the storage batteries. The ac section now

give both a visual and audible indication of system failure.

operates as a 115-volt, 4(X)-Hz, 3-phase generator

The compass alarm system is discussed later in this chapter.

supplying the compass system.

Mk19 Mod 3A Gyrocompass Controls

Standby Power Supply

All controls for the Mk 19 Mod 3A gyrocompass

The standby power supply (fig. 4-20) is a

motor-generator set that provides emergency power for

system (fig. 4-26, views A and B) are contained in four

Figure 4-26.--A. Meridian gyro control system. B. Block diagram of a slave gyro control system.