User guide

93
Pedestal
The cables are sized to last the life of the positioner. No replacement from wear is expected. The spring package at one end
will automatically compensate for any elongation of the cable. At installation, the Belleville springs are collapsed until no "air"
is seen between the springs. You should check this condition yearly to account for the slow settling of the cable strands. Use
a 3/8 box-end wrench to tighten the nut. Be sure not to over tighten.
Azimuth Position Feedback
The azimuth position feedback is produced by a 10-turn, 1K-ohm potentiometer driven by the output shaft of the worm
gearbox. In addition, an optical encoder is mounted to the output shaft on the motor and provides redundant feedback on
azimuth position. The encoder also provides precise redundant feedback on unit’s position relative to zero degrees starting
position. The potentiometer is mounted on an angle plate that is mounted to the azimuth gearbox. A gear mounted to the
potentiometer is driven by a pinion on the output shaft of the gearbox. The potentiometer is mechanically set at the one-half
travel position when the azimuth cable position is at zero degrees. The azimuth stow switch is a magnetic proximity switch
mounted in the az platform. The limits are controlled by using inputs from the potentiometer and optical encoder together
and are set in and controlled by the TracStar controller. The azimuth drive has the mechanical capability of ± 400° or ±200°
from stow position.
8: Elevation Positioning System
Elevation Pivot Assembly
The elevation pivot assembly consists of two elevation drum assemblies
pivoting between two clevis blades that house the high-tech,
no-lubrication required, plastic bushings. No wear or maintenance is expected.