11-APR-06 Rev E OMACS3000

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System Description
Beacon
Receiver
PC with
browser
Ether
net
hub
Beacon
Interface
Box
or
Rack
Mounted
ADU
Motor Control Unit
(MC-2)
Single Board
Computer
(Linux Board)
Handheld
Unit
(Optional)
Fiber
converter Fiber
converter
Ethernet
10BaseT
Ethernet
10BaseT RS-232
Multi-protocol
Accessory
power
Local control
Resolvers
Limit
Switches
Motors
HH Protocol
Optional
0 –10V
sig
strength
DC
UTP
RS-232
SABusprotocol
LMKVS-CPU

Figure 1: System Diagram
The LMKVS-CPU is the overall manager for the antenna position and satellite signal track ing. The LMKVS-
CPU consists of a Single Board Computer (SBC), a Motor Control Unit (MC-2), Variable Freque ncy 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 d irection
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 satelli te. The
initial setup of the ACS3000 include a full set of all satellites. It builds a subset of those satel lites that are
visible to the particular antenna given the antenna latitude and longitude. Using this subset, t he 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 design ates. The
Motor Control Unit will handle the antenna movement rate autonomously once given the coordin ates 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 Beac on
Interface Assembly and browser devices. The Beacon Interface Assembly provides the connecti on via the
Ethernet hub to the Beacon Receiver data. The data is used to position the antenna on the sa tellite during
Step Track or SmarTrack® operation The Motor Control Unit connects directly to the VFD's to contr ol the
motors. The Motor Control Unit also connects directly to the limit switches and the resolvers. T he MC-2
controls the rate loop used to move the antenna via the hardware and does not need software fee dback to
speed up or slow down the movement. The Motor Control Unit communicates with the Single B oard
Computer via an internal RS-422 connection.