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Maintenance and Troubleshooting
ST144-21 C/Ku-Band TVRO
13-14
13.7.5.
The DacRemP
DISPIVC
graph chart provides a means for monitoring the accumulated velocity errors of the
antenna for diagnostic purposes. If this error is excessive, it indicates external forces are acting on the
antenna. These forces may be the result of but not restricted to static imbalance, excessive bearing friction,
cable binding, or wind loading. If these forces cause the antenna to mis-point by more than 0.5° from the
desired position the PCU will flag a “Stab Limit” error.
Antenna Loop Error Monitoring
•
To view the position error, select the
graph chart.
•
This chart displays sensed axis errors via three traces, CL (Cross Level), LV (Elevation), and AZ
(Azimuth), at a fixed 0.05
º
/ vertical division.
•
The normal trace average will plots it’s display
±
3 divisions from the red reference line. Any trace
line average plotted above this is of concern and troubleshooting required. The example below
shows the forces exerted onto the antenna as a resultant of DishScan® Drive. The example below
shows the results of various forces put upon antenna.
•
Cross-Level Axis physically moved CCW (down to the left.) and then CW (up to the right.)
Содержание ST144-21
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Страница 14: ...Introduction ST144 21 C Ku Band TVRO 1 4 This Page Intentionally Left Blank ...
Страница 22: ...Site Survey ST144 21 C Ku Band TVRO 2 8 This Page Intentionally Left Blank ...
Страница 52: ...Setup Ships Gyro Compass ST144 21 C Ku Band TVRO 5 2 This Page Intentionally Left Blank ...
Страница 56: ...Determine Internal Tracking Receiver Settings ST144 21 C Ku Band TVRO 6 4 This Page Intentionally Left Blank ...
Страница 60: ...Setup Home Flag Offset ST144 21 C Ku Band TVRO 7 4 This Page Intentionally Left Blank ...
Страница 68: ...Setup Searching ST144 21 C Ku Band TVRO 9 6 This Page Intentionally Left Blank ...
Страница 104: ...Maintenance and Troubleshooting ST144 21 C Ku Band TVRO 13 28 This Page Intentionally Left Blank ...
Страница 112: ...Model ST144 21 Drawings ST144 21 C Ku Band TVRO 15 2 This Page Intentionally Left Blank ...
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