Azimuth Axis Interface
The RC3000A is designed to drive a low-voltage DC motor in azimuth. The absolute maximum
allowed motor current is 12 Amps. The motor-gearbox can be protected from excessive torque
by OEM-specified resettable fuses in the drive system (specify desired maximum motor current).
The RC3000A uses a solid-sate motor controller (model 25A8 from Advanced Motion Controls –
(805)389-1935) The RC3000A supports both fast and slow speed speed az/el motor movement.
The motor controller employs dynamic braking.
The 3000B is designed to drive a 90 volt DC azimuth motor. The motor should be rated at 1
horsepower or less. The 8097 uses a builtin solid state motor controller (model KBPB from
Penta Power - (800)221-6570) for the azimuth and elevation motors. The RC3000B supports
both fast and slow speed speed az/el motor movement. The motor controller employs dynamic
braking.
A 1K or 5K ohm potentiometer can used for azimuth position sensing. The 3000 employs a 10
bit A/D (analog to digital) converter to sense azimuth. Position resolution can be calculated by
dividing the total designed azimuth travel by 983. (eg. +90° mount has 180° total travel B 983 =
0.18° azimuth resolution) The RC3000 is setup for symmetrical azimuth travel. For
asymmetrical travel contact RCI. The potentiometer can be connected directly to the azimuth
axis (1:1 gear ratio) or driven by a gear. When ordering a 3000 for a new mount, the user should
specify:
1) The total possible travel for the antenna in azimuth. (eg. +140 °)
2) Where the limits should be set. (eg. +135°)
3) The number of turns possible for the azimuth pot. (alternatively the pot manufacturer and
part number) (eg. 5-turns)
4) The gear ratio between the pot and the azimuth axis. (eg. 10:1)
The RC3000 supports an azimuth stow limit. When this switch is closed the controller will allow
the antenna to move below the elevation down limit until the elevation stow limit is active. The
3000 does not support cw and ccw limit switches. These limits are derived from the
potentiometer voltage. If required, the user may add in limit switches incorporating steering
diodes on the antenna mount.
Elevation Axis Interface
The RC3000 elevation motor interfaces (A and B versions) are similar to the azimuth axis. The
elevation sensor is an inclinometer (AccuStar 02111002-000 by Schaevitz (609)662-8000) which
produces an analog voltage proportional to the true elevation angle. The inclinometer must be
mounted on a surface of the antenna mount that allows it to rotate with elevation. See the
accompanying diagram for the physical dimensions of the inclinometer.
The 3000 supports elevation stow, down, and up limit switches. If the azimuth stow limit is not
active, the antenna can only be moved in elevation between the down limit and up limit. If the
azimuth stow limit is active, the antenna may be moved in elevation between the elevation stow
(11 strony)
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