Dawn CONTROL-1500A Manual page 22

CONTROL-1500A Single Axis Antenna Controller
Chapter 3 Installation/Setup 15
output (connected to Sensor AZ +), and the green lead is the sensor ground connection which
is tied to the Sensor AZ – terminal.
With a reed switch type sensor, the alternating magnetic field causes a mechanical switch to
make and break. A reed switch sensor has two connections to the controller: ground and the
pulse input. Internally, the pulse input of the controller is tied to 5.7 volts through a pullup
resistor. A reed switch sensor is not polarized, either output wire from the reed switch module
can be connected to either terminal of the controller. One of the reed switch outputs should be
connected to the controller's J1-6 terminal (labeled Sensor AZ –). The other reed switch
output should be connected to the controller's J1-7 terminal (labeled Sensor AZ +). The drain
wire of the interface cable MUST be connected to the controller's J1-6 terminal (labeled
Sensor AZ –).
Some installers feel that Hall effect switches are more reliable because they contain no moving
parts. Hall effect sensors, however, are more vulnerable to lightning strikes because of the
Hall effect transistor device.
Figures 3.2 and 3.3 detail the connection of an CONTROL-1500 to reed switch and Hall effect
type sensors, respectively. Under no circumstances should the motor drive current be carried
within the same shield as the position sense lines. Note that satellite antenna actuator cable
typically includes two unshielded 14 or 16 AWG conductors for motor current and a shielded
triple with bare drain wire for the sense lines all enclosed in a common insulating jacket – this
type of cable works well with the CONTROL-1500.
Figure 3.1 CONTROL--1500A Back Panel Diagram
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