Sea Tel 9711-92, Installation And Operation Manual

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9711-92 Ku-Band TXRX Installation Troubleshooting
17-5
Home switch (flag) verification (Unlimited Az
systems only) DISPV (Ref) Stabilization
Remote Tilt Verification DISPV (Ref) Targeting
Stabilization
Level cage/Level PCB alignment Verification
(sensor alignment)
DISPV (Ref) Targeting
Stabilization
Rate Sensor Output Verification DISPW (Rate) Stabilization
Level and CL fine balance Verification DISPTC (Drive) Stabilization
AZ Friction Torque Test DISPTC (Drive) Stabilization
DishScan® Drive/Phase DishScan® XY Tracking
Stabilization
17.3.4. Antenna Loop Error Monitoring
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.
•
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 its 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.