Model 1200K/1210K - RCI SNG ANTENNA SYSTEM
14
Operation and Maintenance Manual
Figure 4.3
4.4 ELEVATION ROTO-LOK® CABLE DRIVE
The patented elevation Roto-Lok® drive produces a zero backlash; high stiffness, no wear, no lubrication,
and maximum reliability drive system. The system consists of 12 1/16, 7 x 19 stainless
steel aircraft control cables reverse wrapped three times around the capstan with solid connections
on one end and high force, Belleville springs on the other end. Eight cables have the capacity to
withstand a 75 mph wind load. The additional cables are used to provided increased stiffness and drive
redundancy.
If a cable becomes damaged during usage, cut off cable and continue to use
positioner. Replace cable when time permits at your maintenance facility.
The cables are sized to last the life of the positioner. The springs will automatically compensate for any
elongation of the cable.
The position should be checked per the periodic maintenance
schedule in Section 6. If the cables have drifted, manually move
cables using blunt instrument on elevation drums until correct position
is obtained.
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 pliers to
hold stud and ¼ box end wrench to tighten nut.
Be sure not to over
tighten. Just almost fully, collapse springs.
(Fig. 4.3)
4.5 ELEVATION POSITION FEEDBACK
The elevation position feedback is produced by an electronic
inclinometer located in the feed housing. (Fig 4.4) No adjustment or maintenance is required. The
inclinometer is electronically zeroed in the controller. See Section 2.3 in the RCI 3000/3050 Controller
Manual.
Figure 4.4
