Fine Balance And Monitoring Motor Drive Torque - Sea Tel 9797B-70 C-Band TX/RX Installation And Operation Manual

Maintenance and Troubleshooting
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7.3.7. Fine Balance and Monitoring Motor Drive Torque

The DacRemP DISPTC graph chart provides a means for monitoring torque commands required for each
motor for diagnostic purposes and verifying antenna balance. By observing each trace, the required drive of
the antenna via the motor driver PCB may be established.
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The Cross Level display should decrease (plots below red line) as the antenna is tilted to the left and
increase (plots above red line) as the antenna tilted to the right.
The Level display should decrease (plots below red line) as the antenna is tilted forward and increase
(plots above red line) as the antenna is tilted back.
The Azimuth display should decrease (plots below red line) as the antenna is rotated CCW and
increase (plots above red line) as the antenna is rotated CW. In the example below, the output of
the Azimuth rate sensor is plotted above the reference line, indicating that the antenna was driven
CW in Azimuth. Due to the in-practicality of driving an axis at a consistent rate, verification of rate
sensor output is, for the most part restricted to a positive or negative response of the Level Cage
movement (plotting above or below the red reference line of each axis).
To view the Torque Commands, select the
This chart displays the Torque Command errors for each axis via three traces, CL (Cross Level), LV
(Elevation), and AZ (Azimuth), at a fixed 0.195amps/vertical division.
9797B-70 C-Band TXRX
7-8
graph chart.