Sea Tel 9797A-27, Инструкция по установке и эксплуатации

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Maintenance and Troubleshooting 9797A-27 C-Band TXRX
7-6
this mode any 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.
This Satellite Reference diagnostic mode can be used to determine if tracking errors are caused by faulty
gyro inputs or it may be used as the normal operating mode on vessels that do not have a reliable gyro
compass reference with some reduced system flexibility.
It is best to position the antenna ON the satellite in the regular operating mode first and then turn ON the
Satellite Reference mode. This will keep the PCU from adjusting the rate sensor bias as a result of a
search for the satellite signal.
To enable Satellite Reference Mode , select the REMOTE COMMAND window on the ACU. Key in .94
and then hit the ENTER key (note the decimal point) to access the utility commands. " ^0000 " should
appear in the command window. Key in 71 and hit ENTER to put the PCU in Satellite Reference Mode.
To disable Satellite Reference Mode (return the PCU to normal mode), select the REMOTE COMMAND
window on the ACU. Key in .94 and then hit the ENTER key (note the decimal point) to access the utility
commands. " ^0000 " should appear in the command window. Key in 0 and hit ENTER to put the PCU
back into normal mode.
7.3.9. To Read/Decode an ACU Error Code 0008 (Pedestal Error):
Select the REMOTE COMMAND window on the ACU and;
1
Key in .83 and then hit the ENTER key (note the decimal point). "^0000" should appear in the
command window.
2
Press MODE, or ENTER, to go to REMOTE MONITOR window. SAB C @ will be displayed (S
followed by 3 letters and a symbol (checksum). The fourth letter ( C above ) is the pedestal error
letter. Ref is an AZ Reference, encoder or Home Flag error. AZ is Azimuth, LV is Level
(Elevation) and CL is Cross-Level. Decode the letter code using the chart below:
Letter REF AZ LV CL Description of Pedestal Error
0 0 0 0 None
A 0 0 0 0 CL
B 0 0 1 0 LV
C 0 0 1 1 CL + LV
D 0 1 0 0 AZ
E 0 1 0 1 AZ + CL
F 0 1 1 0 AZ + LV
G 0 1 1 1 AZ + LV + CL
H 1 0 0 0 Ref
I 1 0 0 1 Ref + CL