RESEARCH CONCEPTS RC2000C Manual page 16

10 RC2000C Polar Tracking Antenna Controller
3.2 Mechanical and Electrical Installation
This section covers the mechanical and electrical installation of the unit. Use 4 #10-32 mounting screws
to secure the unit to a standard 19" rack. Please refer to figures 3.1, 3.2, and 3.3 for diagrams of the
controller back panel and electrical connections.
The following electrical connections must be made:
Azimuth and Elevation Motor Drive
These cables connect the controller to the azimuth and elevation motors. The conductors must be sized
appropriately so that sufficient voltage is supplied to the motors. The voltage supplied to the motors will
be the output voltage from the controller less the voltage drop caused by the resistance of the wires.
The output voltage of the controller is a function of the current supplied to the motors. The voltage drop
in the wires connecting the controller to the antenna is determined by the wire size, the wire length, and
the current supplied to the motors. Figure A in the back of this manual shows the relationship between
the controller output voltage and load current.
The following tables show the separation between the controller and the antenna which will result in 28
and 22 volts being applied to the antenna drive motors as a function of motor current and wire gauge.
The tables take into account the controller output loading and resistive losses in the conductors.
Separation (in feet) between controller and antenna which will result in 28 volts being applied to the
motors:
Separation (in feet) between controller and antenna which will result in 22 volts being applied to the
motors:
A typical 36 volt actuator will draw 2 to 4 amps and will run at voltages down to about 12 volts.
TM
Polarotor
- 3 wires in a shielded cable.
Connect the polarotor as shown in either figure 3.2 or 3.3. Shielded cable is required to minimize noise
pickup.
NOTE: A SHIELDED CABLE IS REQUIRED FOR THE POLAROTOR
CONNECTED TO J1-9 ON THE BACK OF THE CONTROLLER AND MUST NOT BE CONNECTED AT
THE ANTENNA.
Azimuth and Elevation Position Sense
If reed switch sensors are used, each axis requires 2 wires in a shielded cable. If Hall effect sensors are
used, each axis requires 3 wires in a shielded cable. Shielded cables are required to minimize noise
Research Concepts, Inc. • 5420 Martindale Road • Shawnee, Kansas 66218-9680 • USA www.researchconcepts.com
- 4 wires (2 for each axis)
Motor
Current 16 14
2 amps 600 950
3 amps 340 520
4 amps 220 340
6 amps 90 140
8 amps 30 40
Motor
Current 16 14
2 amps 970 1530
3 amps 580 920
4 amps 400 640
6 amps 220 340
8 amps 120 190
Chapter 3
Wire Gauge
12 10
1500 2410
830 1350
550 880
230 340
70 120
Wire Gauge
12 10
2430 3930
1460 2370
1020 1650
550 880
310 500
. THE SHIELD MUST BE
TM
Installation/Setup