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7.2.1.6
Azimuth Stow switch
The controller uses the Az. potentiometer voltage to determine limits. Therefore, the AvL positioner is
equipped with only an azimuth stow position switch to determine the stow position. The azimuth stow
switch should trigger magnetically at the azimuth physical zero position.
The azimuth stow switch is mounted on the azimuth platform and is accessible under the Az/El cover.
The switch is fixed relative to the mounting surface and is actuated by a permanent magnet located on
the azimuth bearing drum.
The logic of “Stowing” and “Acquire” requires that all axes be centered to physical zero for the antenna
to complete its cycles.
Figure 7.2.1.6 – Azimuth Stow Switch
7.2.1.7
Notes on Azimuth Settings
-
The limits should be set after the potentiometer has been centered. Anytime the potentiometer
is moved or repositioned, the limits should be reset.
-
The Az angle displayed by the ACU is affected by several parameters in the ACU. (These include
Az Scale Factor, Az Reference Position, etc.).
-
While setting the limits, watch the Az capstan to make sure it does not run to the physical end of
the cables. This could result in one or more of the cables breaking.
-
After integration (external equipment, location, etc.), limits should be checked and set for safe
travel.
Magnet on Az base plate
moves across sensor end
Typical as installed
