Figure 4-21.--Two views of master compass element and supporting element.

Figure 4-21.--Two views of master compass element and supporting element.

personnel, damage to the controls, or accidental change

phantom assembly, the meridian gyro on top, and the

of setting.

slave gyro, upside down, on the underside. The gyro

motors are 2-pole, 115-volt, 3-phase, 400-Hz squirrel

COMPUTER INDICATOR PANEL.-- Located

cage induction motors. The meridian gyro rotates

below the control panel, and inside the cabinet, are seven

approximately 23,600 rpm clockwise viewed from the

computer assemblies for computing data for the

south, and the slave gyro rotates at the same speed

systems. The computer indicator panel (fig. 4-23)

counterclockwise viewed from the east.

consists of seven windows. A dial is visible behind each

window to indicate the data being computed by its

The azimuth phantom is made to follow the azimuth

associated computer assembly. These assemblies are

motion of the meridian gyro and 1- and 36-speed

discussed later under the control system in which they

heading data are transmitted by the azimuth servo and

are used.

synchro assemblies mounted on the phantom assembly.

The roll and pitch phantom is stabilized in roll and pitch,

COMPUTER CONTROL ASSEMBLY.-- To

and 2- and 36-speed roll and pitch data are transmitted

minimize the number of amplifiers used in the system,

by the roll and pitch servo and synchro assemblies

two types of standard plug-in computer amplifiers are

mounted on the frame and binnacle.

used in 13 applications. As the characteristics and the

circuits in which the amplifiers are used vary, other

Control Cabinet

components peculiar to a single circuit must also be

used. For this reason, a T-shaped panel, known as the

The control cabinet (fig. 4-20) contains the control

computer control assembly, is located inside the control

panel, the computer indicator panel, a dc power supply,

cabinet. This panel provides a junction box into which

analog computers, amplifiers, and other assemblies

the amplifiers may be plugged. This panel also serves

required for operating and indicating the condition of

as a chassis for the various components required to

the master compass.

match the standard amplifiers to the particular circuits

concerned. The computer control assembly houses 11

CONTROL PANEL.-- The control panel (fig.

type 1, and 2 type 2 general-purpose computer

4-22) contains all the switches, alarm lamps, and

amplifiers, and all the components required to operate

indicator fuses required for operating the system. Only

the various computer and torque circuits, other than

the controls required for normal operation of the system

those contained in the mechanical assemblies or in the

are accessible when the control cabinet is closed. These

master compass.

controls are on a recessed panel to avoid injury to

4-17