Model 950 Antenna Control System
Model 950 Antenna Control System
Full featured inverter drive control
The Model 950 Control Systems
can be used with almost any limited
motion antenna for precision
satellite tracking applications.
Tracking, Pointing, and Acquisition modes
Ideal for single AC motor (per axis) antennas
Single, Dual, or Multi-speed antenna motor drives
Stable or inclined GEO targets
Flexible receiver options
Designed to minimize site cabling
Pointing Accuracy
The system comprises an Antenna Control Unit (ACU),
Tracking Receiver Unit (TRU) and a Power Drive
Unit (PDU) which are linked via dedicated Ethernet
connections. This provides flexibility in locating the key
system components, allows for variable separation
distances and provides immunity to electrical ground
plane transients.
Normally better than 0.05º RMS in winds of 30 mph
gusting to 45 mph. This includes all drive train errors,
but excludes structural errors between the position
transducers and RF beam.
Tracking Accuracy - Optrack
Normally better than 5% of the receive beamwidth in
winds of 30 mph gusting to 45 mph, satellite inclination
of up to 15º and signal scintillation of up to 2 dB.
Operational Modes
Intelsat 11
Star Track
Sun Track
Moon Track.
Box Scan
Geo Scan
Control units
Antenna Control Unit
Portable Maintenance Unit
The Antenna Control Unit (ACU) is the primary control
and monitor interface point for the entire system,
featuring a friendly touch screen windowed interface.
The Portable Maintenance Unit (PMU) provides
manually commanded, bi-directional control
of all axes. It has the following features:
7RU ACU with 15 Inch Touch Screen
• Hand held ruggedized unit with
a 10-ft pendant cable and 40-ft
extension cable for convenient
local operation at the antenna
• Backup means of moving antenna
and is ACU independent
• Four line, 20 character
display for axis positions,
tracking signal strength, and
scrolling status messages
• Modes include position
jog and Hi/Lo speed
Features of the ACU are:
• Optional weather proof
access junction boxes at
convienient antenna locations
• Optrack, which provides high performance tracking
of stable or inclined orbit satellites with an adaptive,
self-learning ephemeris modeling mode
• Enable/Disable per axis
• Easy touch screen operation
Manual Control Unit
• Informative display with full text color readouts
• Extensive diagnostic monitoring and test capabilities
• Antenna and satellite simulators
• Supervisory Control Link
(Ethernet; TCP/IP or RS-232/422).
• Fully software field upgradable
Receiver Options
• Model 500 series of Tracking Receivers in
Analog, or Digital with Spectrum Display.
• 2 RU Digital Model 550 with dual 5 inch displays
• 2 RU Analog Model 520 with dual 5 inch displays
• Model 520 or 550 Receiver module mounted behind
ACU for zero additional rack space requirements.
• Receivers also available with internal block down
converters for common frequency bands
The Manual Control Unit (MCU) provides manually
commanded, bi-directional control of all axes. It has the
following features:
• Slim, 1RU chassis
• PMU functionality
System Options
• Fiber Optic ACU-PDU Link
• Time Synchronization via NTP
• Manual Control Unit
• Rack mount Tracking Receiver
• Extended low temperature operation
• Extended Warranty
• PDU configurable for various motor sizes and
polarization controls.
• E-Stops in panel mount or J-Box
Power drive components
Multi-Speed Inverter PDU
The Power Drive Unit (PDU) provides all digital control
to the AC drive motors and contains the hardware/
firmware logic to close the position and tracking
loops with high resolution. It also provides controlled
acceleration and deceleration profile & speed regulation
range of up to 15:1 with conventional inverter rated AC
motor (antenna system dependant).
The inverter PDU’s are free-standing, housed in
an NEMA 4 (IP66 equivalent) aluminum enclosure
and contains the electrical/mechanical components
necessary to move the antenna. The PDU contains
an internal fan for ambient air circulation and “hot spot”
avoidance and an optional thermostat controlled,
internal heater for cold weather operations. Single
speed contactor configurations are also supported.
A lockable handle secures the access door while
the system is operating. A Lockout, Tagout power
disconnect is provided on the cabinet exterior. Mounted
in the enclosure is a panel assembly consisting of the
Antenna Control Board (ACB) logic, power supply,
inverter drives, and various ancillary devices. Status
interlocks and position signals report to the ACB and,
while in constant communication with the ACU, the ACB
transmits information and receives commands to control
movement of any antenna axes.
Communication within the system via Ethernet between
ACU, TRU, and PDU by a dedicated controller.
A second Ethernet controller and port provides
independent connection to M&C or customer WAN.
System design minimizes cable installation cost and
complexity, and allows for flexible site layout.
1:1 Resolver
• 0.0055° Resolution,
0.05° Accuracy
• Standard 16 bit
Position Encoder
AC Motor Support
• Single or multiple
inverter duty windings.
• Optional Handcrank
• 0.00001º Resolution,
0.0055º Accuracy
• 208-480v 3 phase voltage
windings available.
• 25-bit Optical
• Overtemp interlock.
• Up to 5 HP standard, larger upon request.
Typical Model 950 System Diagram
Tracking accuracy ≤ 5% of Beamwidth
Pointing accuracy ≤ 0.05° RMS
Total system results are antenna (mechanically) dependent
CE, FCC Class A compliant
7RU rack mount chassis with slides
12.25" H x 19" W x 3" D
10 lbs
Single phase, 110-240 VAC 350 VA
AC Inverter
66.5” H x 30” W x 11.25” D
(Including for Floor Stand)
230 lbs
Single speed contactor.
Single Phase Electronics, 100-250 VAC 500 VA
208/380/415 VAC, 3ø, KVA motor dependent
Three Phase 200-240 Vac, 7.5 HP max
Three Phase 380-480 Vac, 10 HP max
Single speed 5HP max, 208/380/415 3 phase
1RU rack mount chassis with slides
1.75" H x 19" W x 8" D
5 lbs
0° to 50° C
Powered by PDU
95% Non-Condensing
-20° to 50° C
100% Condensing
Operating-Outdoor (optional extended)
-40° to 40° C
100% Condensing
-10° to 70° C
100% Condensing
General Dynamics SATCOM Technologies
1219 Digital Drive • Richardson, Texas 75081 • Tel: 972-852-5301 • Fax: 972-852-5305 •
© 2015 General Dynamics. All rights reserved. General Dynamics reserves the right to make changes in its products and specifications at any time and without notice.
GD-SatcomTech 950 August 2015
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