NORTHROP GRUMMAN Sperry Marine NAVIGAT X MK 2, Руководство по сборке

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NAVIGAT X Mk 2 056341 Rev. AA
8: Gyroshpere Installation and Service Page 8-11
on, the container will follow the motion of the gyrosphere. Locking may
be lost several times during the early settling phase, but as soon as the
gyrosphere current reaches the normal operational level, the container
must remain locked to the gyrosphere.
3) In the Service Setup 2 (code 610), select the gyrosphere data sub-menu to
observe the gyrosphere current:
If 45 minutes after power-up, a gyrosphere current above 300 mA is dis-
played in the gyrosphere data sub-menu, the value should be confirmed
by measuring directly at the test resistor R 54 (1
Ω
) on the main PCB.
The AC-voltage present accross test resistor R 54 in mV equals the gyro-
sphere current in mA.
4) After a settling time of at least 4 hours, verify that the compass has settled
to the correct heading:
a) In case of an initial installation, check that the heading shows the correct
value approximately, taking into account the existing misalignment of
the compass. Then, carry out the alignment error correction procedure.
After the alignment error correction has been carried out, the compass is
to display the vessel's true heading to an accuracy of ±0.5°.
b) In case of an exchange of the gyrosphere or the mercury and fluids only,
the displayed heading should be accurate within ±1.0°. If necessary, ad-
just the stored alignment error correction value so that the compass dis-
plays the vessel's true heading to an accuracy of ±0.5°.
5) In case of an 18-month or five-year maintenance, or if the gyrosphere has
been replaced, a special service setup menu must now be called up to re-
set the gyrosphere operation time counter.
The access code for this setup menu is disclosed to authorized service per-
sonnel only.
6) If the nav. data printer NAVIPRINT is used, enter the current date and time
in the User Setup.
Directly after power-up, the gyrosphere current
should not exceed 550 mA. The current will gradu-
ally fall while the gyrosphere settles.
Within 45 minutes after power-up, the gyrosphere
current must have dropped to a value below 300
mA.
TEMPERATURE 42 °C
GYRO CURR 432 mA
PH BRIDGE 10 mV
GYROSHPERE DATA
TEMPERATURE 42 °C
GYRO CURR 234 mA
PH BRIDGE 10 mV
GYROSHPERE DATA
Caution
If 45 minutes after power-up, the gyrosphere current has not dropped below
300 mA, the gyrosphere is not working properly.
If visual inspection reveals no obvious cause of malfunction, the gyrosphere is
to be regarded defective and must be replaced.