Fine Balance And Monitoring Motor Drive Torque - Sea Tel 9711-92 Installation And Operation Manual

9711-92 Ku-Band TXRX
5.
6.
18.3.2.
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.
bottom to the top. Always move weight from one location on the equipment frame to the same
location on the opposite side of the equipment frame (ie from the top left of the reflector
mounting frame to the bottom left of the reflector mounting frame). Do NOT add counter-weight
during this step.
When completed, the antenna will stay at any position it is pointed in for at least 5 minutes (with no
ship motion).
Do NOT cycle antenna power to re-Initialize the antenna. Return to the ACU, which is still in
REMOTE BALANCE mode, and press ENTER to exit Remote Balance Mode. When you exit Balance
Mode the antenna will be re-initialized, which turns DishScan®, Azimuth, Elevation and Cross-Level
drive ON.

Fine Balance and Monitoring Motor Drive Torque

•
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 0.195 amps/vertical division.
•
In all axes, tracing centered on the reference line means that that axis is neutral. Tracing above
the reference line means that that axis is driving CCW. Tracing below the reference line means
that that axis is driving CW.
•
A normal trace display will be ± 1 divisions from the red reference line while under calm sea
conditions and with DishScan® Drive turned off. See example below
•
The Cross Level displayed above the reference line indicates that CL is driving CCW (Left).
Example: The antenna pictured in the screen capture below is imbalanced so that it is "Right Heavy".
The CL trace is plotting above the red reference line (indicating that drive CCW is required to keep
the Cross-Level beam level (to the horizon).
18-3
Maintenance
graph chart.