Figure 3-21.--Cell power.

Figure 3-21.--Cell power.

be set to internal gyro for internal stab-leek operation.

ship, the platform pitches or rolls an equal amount in the

opposite direction. Thus, the platform remains level to

While in this mode, the test switches and manual drive

the horizon or more precisely perpendicular to the local

potentiometer can be operated to enable insertion of

earth gravity vector.

signals independent of the local gyro. This mode enables

the operator to isolate and test various parts of the system

Operational Modes

while disabling other parts.

SHIP GYRO STABILIZATION MODE.- Ship

The system has four operational modes: internal

gyro stabilization is provided as an alternative to plat-

gyro, internal gyro stabilization lock ship gyro, and ship

gyro stabilization leek.

form-mounted internal gyro stabilization. The system

should be operated in the internal gyro mode unless

SGSI SYSTEM NORMAL OPERATING

component failure disables that portion of the circuitry

PROCEDURE.- Stabilization from the internal gyro

is the normal mode of system stabilization and is

since switching to the ship's gyro reduces system

preferred to ship gyro mode because of higher system

accuracy. The internal gyro/ship gyro switch-indicator

accuracy and addition of the gyro failure alarm. The

is on the component panel assembly. A ship gyro in-

system should always be operated in this mode as

dicator on the remote control panel serves to remind

opposed to ship gyro operation unless a system failure

system operators when the alternative stabilization

prevents it. Operating control is normally conducted

from the remote control panel from which the operator

source is in use.

can turn the system on and vary the intensity of the

SHIP GYRO STABILIZATION LOCK

source light. The system may also be turned on at the

MODE.- The ship gyro stabilization leek mode dis-

electronics enclosure assembly when the POWER

connects the ship's gyro signals at the input to the gyro

ON/OFF push button is depressed. Adjustment of the

signal card assembly and replaces them with ground

source light intensity, however, can only be adjusted

at the remote control panel. The normal mode is the

reference or manual drive potentiometer signals. This

interred gyro mode, where the gyro acts as the system

permits check-out and troubleshooting of ship gyro

sensor detecting any eviations from platform level. In

stabilization and stabilization error detecting circuitry.

this mode the platform will always remain level and

The internal gyro/ship gyro switch-indicator on the

cannot be offset.

component panel assembly should be placed in the ship

INTERNAL GYRO STABILIZATION LOCK

gyro position to enable the stabilized platform to track

MODE.- The internal gyro stab-leek mode disconnects

manual drive signals. The lamp control relay

internal gyro signals from the stabilization loop and

extinguishes GSI source lamps while operating in this

locks the platform in a neutral position for test, align-

ment, and troubleshooting purposes. The system must

stab-leek mode.

3-15