NORTHROP GRUMMAN NAVITWIN IV, Руководство по эксплуатации, установке и обслуживанию

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NAVITWIN IV 056360/E
Standard System Configurations 1-5
Dual NAVIGAT Gyrocompass Systems
Standard dual gyrocompass configurations with NAVIGAT X MK 1 or
NAVIGAT 2100 / NAVIGAT 3000 gyrocompasses include a NAVITWIN IV
as the system‘s central operating unit and a Switch-Over Unit to distrib-
ute data from the compasses to external equipment.
At the NAVITWIN IV, either one of the gyrocompasses may be activated
to become the heading reference for external equipment, such as head-
ing control systems, RADAR, compass repeaters etc.
In conjunction with a Sperry Marine fluxgate sensor, type 4863, or an
electronic compass, the NAVITWIN IV also provides an independent
magnetic compass heading source (TMC function).
In case of failure of both gyrocompasses, the magnetic compass may be
activated to provide an emergency heading reference for repeaters and
other peripheral equipment.
The NAVITWIN IV applies magnetic variation to the raw sensor value
and provides a correction table to compensates for the sensor‘s devia-
tions from the magnetic compass heading.
The “heading diff.” alarm function permits to monitor the gyrocom-
passes against each other or against the magnetic compass heading.
The “off heading” alarm function permits to monitor the difference
between the actual heading and the heading to steer received from a
heading control system.
Operating parameters entered at the NAVITWIN IV are transmitted to
the NAVIGAT gyrocompasses. In turn, alarms generated by the com-
passes are indicated and may be acknowledged at the NAVITWIN IV.
Figure 1-2 below illustrates how the active source selection at the
NAVITWIN IV controls the distribution of data from the compasses, via
the Switch-Over Unit, to external equipment.
Figure 1-2:
Data distribution in
a NAVIGAT *dual gyro-
compass / TMC system
* The NAVIGAT 3000 is as well representative for the NAVIGAT 2100,
not shown in the above figure.
GYRO
1
MAGN
COMP
246.8
247.0
GYRO
2
246.7
NAVITWIN IV
source selection
Switch-Over
Unit
to external
equipment
mag. hdg.magmag mag
. h
dg.dg. dg. dg.dg. dg. dg.
mag
. h
dg.
. h
dg.dg.dg.
Magnetic
Compass
NAVIGAT X MK 1 or
NAVIGAT 3000
NAVIGAT X MK 1 or
NAVIGAT 3000
G/M G1/G2
NAVIGA
NAVIGA