ComNav 2001 Autopilot System
P/N 29010017 V1.0 - 51-
GYRO COMPASS INTERFACE
Read this section only if your autopilot has the optional gyrocompass interface.
OPERATION
To engage the gyrocompass, press the GYRO
ON/SET key on the front panel of the autopilot.
The digital heading displayed by the autopilot
may be adjusted to agree with the master
gyrocompass by rotating the master select switch
to the STANDBY position, pressing and holding
the GYRO ON/SET key and pressing the up or
down ARROW key. In all other respects, the
autopilot operates as described in the manual.
The autopilot will remember that it was in
GYRO mode when it was turned off, and will
remain in GYRO mode when turned on again. It
will use information from the vessel's magnetic
compass to make a 'best guess' at the current
heading of the gyrocompass during turn on.
The alarm will sound, and the display will show
'GC.Er', if a failure of the gyrocompass occurs in
a manner detectable by the autopilot (caused by
all the signal lines from the gyrocompass going
high or low simultaneously for at least two
seconds). It will read the magnetic compass once
to determine the current magnetic heading, reset
the course it is steering to that heading, and
change to using the magnetic compass as the
heading reference.
To disengage the gyrocompass and return to
control by the magnetic compass, press the
GYRO OFF key on the front panel of the
autopilot
INSTALLATION
MAKE SURE YOU HAVE THE CORRECT
AUTOPILOT AND INTERFACE.
This autopilot and interface is intended for use
with a gyrocompass which has either a gear
driven synchro output with a 360:1, 180:1, 90:1
or 36:1 gear ratio (36:1 requires 02.06/01.15
software), or a 3, 6, or 12 steps/degree step type
output. If the gyrocompass has a 1:1 synchro
output (ie Sperry SR50) you need a different
model of 2001 autopilot and a different interface.
Contact the factory or your dealer for assistance.
No. 8 holes are provided in the bottom of the box
for mounting. Position and mount the
gyrocompass interface box so that it will remain
dry, the terminals are accessible and the 10 foot
cable supplied with it will reach the rear of the
autopilot. Run a cable from the gyrocompass
output to the gyrocompass interface box, bringing
it inside the box through the rubber grommet or
gland.
Make sure that the gyrocompass is turned off, or
the output circuit in the gyrocompass is
disconnected before terminating either end of this
cable.
If the gyrocompass has a SYNCHRO output,
only three wires (S1, S2 and S3) are required.
If the gyrocompass has a STEP output, four
wires will be required (S1, S2, S3 and
COMMON). The connection of the COMMON
wire inside the gyrocompass depends on the type
of output circuitry the gyrocompass has. If the
gyrocompass has 'open collector' transistors
which switch to ground you will require a
POSITIVE connection of the COMMON wire. If
the gyrocompass has 'open emitter' transistors
which switch to positive, you will require a
GROUND connection for the COMMON wire. It
may be necessary to inspect the output circuit
schematic of the gyrocompass to make this
determination.
If you make the wrong connection of the
COMMON wire, no damage will result to the
interface, it simply won't work. Fasten the wires
into their appropriate terminals inside the
gyrocompass interface.
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