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Robertson AP9 Mk3 Autopilot
5.4
Heading sensors
In the case of dual station system, the heading sensor shall be connected
Note !
only to the main control unit.
General
The AP9 MK3 is capable
of reading most types of
heading reference sensors.
These can be magnetic
compasses,
sensors or gyrocompasses.
Combination of different
sensors can be made, the
maximum
is: 2 magnetic compasses,
1 gyro compass (synchro),
1 gyro compass (stepper),
1 gyro compass (current
loop)
compass.
Two gyros of same type
cannot be used simul-
taneously, e.g. 2 synchros
or
fluxgates.
A gyro compass with only
Note !
serial data output, can not be used in a dual station configuration.
When delivered from the factory, the AP9 MK3 is prepared for
magnetic compasses and fluxgate compass. Gyro compass with
serial/current loop output may also be directly connected, but SW1-6
on the Interface Board must be set to ON position. For connection to
other types of gyros, the AP9 MK3 Gyro Interface Board is required,
and switches on the Interface Board must be set to correct position.
See page 5-58.
Desired steering compass and Monitor compass are selected by
means
INCREASE/DECREASE button on the front panel. See page 2-6.
Magnetic compass
To obtain an accurate heading from the magnetic compass, great care
should be taken when determining the location of the compass. If
possible, select a location that provides a solid horizontal mounting
base, free from vibration and as close to the vessel's centre of roll and
pitch as possible. It should be as far as possible from disturbing
5-4
fluxgate
configuration
and
1
fluxgate
2
steppers
or
of
the
COMPASS
AP9 MK3
H
OUT
L
A
H
IN
L
H
OUT
L
B
H
IN
L
NOTE: In Dual Station configuration, serial heading data
can not be connected to J3, 1-2.
2
Serial line connections
SELECT
J4
3
OUT
HEADING
6
NMEA (HDT/HDM)
9
IN
NAV. RECEIVER
10
(NMEA)
CHANNEL A
J4
8
OUT
COMM. LINE
6
(DUAL ST./RMP)
IN
1
COMM. LINE
2
(DUAL ST./RMP)
J3
IN
1
SERIAL HEADING DATA
2
CHANNEL B
Fig. 5-5
button
and
the
20169223D
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