056341 Rev. AA
NAVIGAT X Mk 2
Page 8-10
8: Gyroshpere Installation and Service
8.3.3
Power-up Function Test
To verify the correct operation of the compass, the power-up sequence and the
settling of the compass is observed. The gyrosphere current is periodically
checked during the first 45 minutes of operation and the final heading output is
checked after the compass has settled.
Procedure
1)
Power up the gyrocompass system:
2)
Observe the run-up behaviour the gyrosphere:
a) The gyro motors will create a spinning noise which slowly but con-
stantly rises in pitch until the motors reach their final speed of rotation.
b) The gyrosphere will commence a slow oscillatory motion around the
vertical which can be observed through the transparent container. The
amplitude and speed of this motion will gradually decrease while the
sphere settles to its final heading.
c) The follow-up system will turn the container quickly around the sphere
until locking onto a fixed position relative to the gyrosphere. From then
Warning
Warning
When the compass is energized (24 VDC main and/or backup supply present),
the gyrosphere operating voltage of 100 VAC @ 337 Hz is present on the main
PCB, the gyrosphere supply lines and accross the gyrosphere contacts.
When operating the compass while the housing is open, do not touch the main
PCB, the connecting cables to the gyrosphere container or the base contact.
Energize the system at the vessel's switch and fuse
unit.
A startup message is displayed and the initial selft-
est is executed.
The heading display screen is shown, which dis-
plays the heading data from the available com-
passes and the heading difference alarm
threshold.
The system is now operational.
SPERRY MARINE
NAVIGAT X MK 2
>F1
MK2 HEADING
GYRO 1
271.2°
F2 MAGN.C. 270.9°
DIFF G1/M
5° ü
Note
If the basic configuration has not been carried out yet, alarms will be given at
this point. Any alarm relating to missing input data may be safely acknowl-
edged to continue with the run-up function test.
Caution
Should a „GYRO FAILURE“ alarm be given at power-up, the compass is not
working properly.
De-energize the system and visually check the connections to the gyrosphere,
the follow-up step motor and the shaft encoder.
If the failure reoccurs when the compass is powered-up again, the installation
has not been carried out correctly or the gyrosphere is defective.
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