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Setup – Ships Gyro Compass
4009-9 Installation Manual
5-1
5.
Setup – Ships Gyro Compass
The Ships Gyro Compass connection provides true heading (heading of the ship relative to true North) input to the system.
This allows the ACU to target the antenna to a “true” azimuth position to acquire any desired satellite.
After targeting this input keeps the antenna stabilized in azimuth (keeps it pointed at the targeted satellite azimuth). In
normal operation when viewing and ADMC recording in DacRemP, the “Relative Azimuth” trace should do exactly equal
and opposite to whatever the Heading trace does and the “Azimuth” trace should stay flat.
In normal operation the heading display in the ACU should at all times be the same value as the reading on the Gyro
Compass itself (this is also referred to as Gyro Following.).
If the ACU is not following the Ships Gyro Compass correctly (un-erringly) refer to the Troubleshooting Gyro Compass
Problems.
5.1.
Gyro Type
The GYRO TYPE parameter selects the type of gyro compass interface signal, the appropriate hardware
connections and the ratio of the expected input signal for ship turning compensation. Default GYRO TYPE
parameter for all systems is 0002 so that the ACU will properly follow for Step-By-Step or NMEA gyro signals.
The GYRO TYPE parameter must be set correctly to properly read and follow the ship’s Gyro Compass signal that
is being provided. The acceptable settings are:
362
for 360:1 Synchro with S/D Converter
90
for 90:1 Synchro with S/D Converter
36
for 36:1 Synchro with S/D Converter
2
for Step-By-Step gyro or NMEA gyro
1
for 1:1 Synchro with S/D Converter
0
for No Gyro linear AZ Search Mode (No Heading input available)
5.2.
Updating the GYRO TYPE parameter
To manually update, press the LEFT arrow key to bring the cursor under the least significant character. Continue
to move the cursor until the desired character to be edited is underscored (selected). Use the UP or DOWN arrow
keys to increment or decrement the selected character.
Use the LEFT or RIGHT arrow key to move the cursor left or right to select other characters to modify. When you
are finished modifying press ENTER to execute the new value OR press NEXT to abort and exit setup mode.
When you are finished making parameter changes, go to the SAVE NEW PARAMETERS display to save the
changes you have made.
5.3.
If there is NO Ships Gyro Compass
Without heading input to the system the ACU will
NOT
be able to target, or stay stabilized
ON
, a “true” azimuth
pointing angle. This will make satellite acquisition much more difficult and the true azimuth value that any given
satellite should be at will not be displayed correctly.
This mode of operation is NOT recommended for ships. A better solution would be to provide a Satellite
Compass (multiple GPS antenna devices) to provide true heading input to the ACU. These devices are readily
available and are much less expensive than a Gyro Compass.
If there is NO Gyro Compass (ie on a large stationary rig which is anchored to the ocean floor) set the GYRO TYPE
parameter to 0000, the SWEEP INC parameter to 0047 and SAT REF (Satellite Reference Mode) MUST be turned
ON.
This combination of settings will cause “No Gyro” Search pattern to be use to find the desired satellite (refer
to the setup – Searching lesson).
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