Dawn CONTROL-1500A Manual page 27

CONTROL-1500A Single Axis Antenna Controller
potentiometer cable should be tied to the daughterboard's Signal Return terminal, J4-1. The
treatment of the shield on the potentiometer interface cable is the same as for the antenna
position sense lines – see section 3.2.2
The RC2KPOL option can supply around 400 ma to the feed motor. 16 AWG or 18 AWG is
usually sufficient for the drive motor connections.
The potentiometer position sense interface wiring carries minimal current – 22 or 20 AWG
conductors are typically used to connect the controller to the potentiometer. Belden 8772 is a
3 conductor, shielded cable with a bare drain wire that can be used for the potentiometer
interface. Under no circumstances should a 5 conductor shielded cable be used to carry both
the motor current and the potentiometer position sense signals.
Figure 3.4 depicts the connection of a rotating feed device with the CONTROL-1500A. Note that
the potentiometer interface cable's drain wire is connected to the Signal Return terminal (1) of
connector J4.
FIGURE 3.4 Rotating Feed Interface (RC2KPOL Option Only)
Use the following procedure to configure the CONTROL-2000 for use with a 24V DC polarization
motor.
1. Connect the polarization/sensor assembly as shown in figure 3.4. Note that shielded cable
is required for the sensor and that the shield MUST be connected to the GROUND terminal
(1) at the back of the controller and MUST NOT be connected to anything at the antenna.
2. The 24 VDC Rot Feed CONFIG mode item must be set to YES (1). Activate CONFIG
mode and use the SCROLL DOWN key to bring up the 24 VDC Rot Feed item. Key in a 1
followed by the ENTER key. If the 24 VDC Rot Feed item is not accessible in CONFIG
DAWNco • 3340 S. Lapeer Rd • Orion, MI 48359-1320 • Ph (248) 391-9200 • Fax (248) 391-9207 • sales@DAWNco.com
Chapter 3 Installation/Setup 20