Figure 1: System Diagram - Andrew OMACS3000 User Manual

Andrew antenna control system user guide

Hide thumbs

Table Of Contents

Table of Contents

11-APR-06

Optional

PC with

browser

Beacon

Receiver

The LMKVS-CPU is the overall manager for the antenna position and satellite signal tracking. The LMKVS-

CPU consists of a Single Board Computer (SBC), a Motor Control Unit (MC-2), Variable Frequency Drives

(VFD) and an Ethernet interface for web browser display and control.

The LMKVS-CPU can also position the antenna via a hand-held unit. Using the handheld unit direction

control buttons, the antenna may be moved in all three axes.

The ACS3000 primary task will be to position the antenna to the received signal of a selected satellite. The

initial setup of the ACS3000 include a full set of all satellites. It builds a subset of those satellites that are

visible to the particular antenna given the antenna latitude and longitude. Using this subset, the operator may

select a specific satellite to point at and may reposition to any of the satellites in the subset at will. In addition

to the primary task, the ACS3000 is able to move to any specified position the operator designates. The

Motor Control Unit will handle the antenna movement rate autonomously once given the coordinates desired

by the operator or as calculated by the SBC during tracking.

The Ethernet connection to the SBC will tie into an Ethernet hub that directly connects to the Beacon

Interface Assembly and browser devices. The Beacon Interface Assembly provides the connection via the

Ethernet hub to the Beacon Receiver data. The data is used to position the antenna on the satellite during

Step Track or SmarTrack® operation The Motor Control Unit connects directly to the VFD s to control the

motors. The Motor Control Unit also connects directly to the limit switches and the resolvers. The MC-2

controls the rate loop used to move the antenna via the hardware and does not need software feedback to

speed up or slow down the movement. The Motor Control Unit communicates with the Single Board

Computer via an internal RS-422 connection.

(Optional)

Fiber

converter

Ether

net

hub

Ethernet

10BaseT

Beacon

Interface

Box

0 – 10V

Rack

sig

Mounted

strength

ADU