Sea Tel ST88-21 C/Ku-Band TVRO, Инструкция по установке и эксплуатации

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ST88-21 C/Ku-Band TVRO Maintenance and Troubleshooting
13-15
13.7.6. Reference Sensor Monitoring
The DacRemP DISPV graph chart provides a means for monitoring the output of the 2 Axis Tilt Sensor and
the Home Switch sensor for diagnostic purposes. The Tilt sensor (located inside the Level Cage Assembly) is
the primary input for the antenna’s reference to the horizon (0° Elevation and 90° Cross-Level). While the
Home Switch Sensor (located at the antenna base) is used to calibrate the antenna’s position relative to the
vessels BOW.
•
To view the reference sensors, select the graph chart.
•
This chart displays the output of the Tilt Sensor via two traces, CL (Cross Level), LV (Elevation) at a
fixed 1
º
/ vertical division, and the home flag logic level via a single trace, AZ (Azimuth).
•
The normal trace display for the Tilt Sensor, after performing remote tilt calibration, will be
±
4
divisions from the red reference line. Any trace line average plotted above this is of concern and
troubleshooting required. See below for a screen capture of an antenna that is Level in both the
Cross-Level and Elevation Axis.
•
The Cross Level Tilt display should plot on the red reference line when the level cage is level,
referenced to the horizon. It should decrease (plots below red line) when the antenna is tilted to the
left and increase (plots above red line) when tilted to the right. See below for a screen capture of an
abnormal CL trace Plot, it is an indication that the antenna that is either listed to the right approx. 4
degrees or the PCU requires to much CL tilt bias.
•
The Level tilt display should plot on the red reference line when the level cage is level, referenced to
the horizon. It should decrease (plots below red line) when the antenna is tilted forward (EL down)
and increase (plots above red line) when tilted back (EL up).
•
The Azimuth display for the Home Switch will normally display a logic level high (plots directly on
Red reference line after clicking on the
button) when the home flag is NOT engaged and