Sea Tel 3011W-91, Installation Manual

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3011W-91 Installation Manual Setup – Other Parameters
14-2
14.7. Satellite Reference Mode
The ships gyro compass input to the ACU may be accurate and stable in static conditions and yet may NOT be
accurate or stable enough in some underway dynamic conditions. If there is no gyro compass or if the input is corrupt,
not stable or not consistently accurate the tracking errors will become large enough to cause the antenna to be mis-
pointed off satellite.
Satellite Reference Mode will uncouple the gyro reference from the azimuth rate sensor control loop. When operating
in Satellite Reference Mode changes in ships gyro reading will not directly affect the azimuth control loop. The
Pedestal Control Unit will stabilize the antenna based entirely on the azimuth rate sensor loop and the tracking
information from DishScan®. This will keep the azimuth rate sensor position from eventually drifting away at a rate
faster than the tracking loop can correct by using the tracking errors to regulate the rate sensor bias.
Satellite Reference Mode can be used as a diagnostic mode to determine if tracking errors are caused by faulty gyro
inputs.
I t is normally
OFF
as long as you have good gyro compass input. It MUST be
OFF
when the elevation angle is
greater than 75 degrees.
Satellite Reference Mode
•
No Gyro Compass is available
MUST be ON when:
•
Frequent or constant ACU Error Code 0001 (Gyro Compass has failed)
•
Flux Gate Compass is being used
To view, or change, the Satellite Reference Mode status,
select the SAT REF remote parameter:
1.
Press the RIGHT arrow, then press the UP arrow and last press the ENTER key to turn Satellite Reference Mode
ON.
2.
Press the RIGHT arrow, then press the DOWN arrow and last press the ENTER key to turn Satellite Reference
Mode OFF.
If you change this remote parameter, you must save the change using REMOTE PARAMETERS.
14.8. REMOTE PARAMETERS
Allows any remote parameters that have been changed (via Remote Command or Remote Tilt) to be saved. Any
REMOTE changes must be saved to NVRAM in the PCU, or they will be lost when power to the antenna is cycled or
remote reset command is issued. Press RIGHT arrow and then press ENTER to save the parameters in the remote PCU's
NVRAM. A “Parameters Saved” message will be displayed.