document or its contents to nontransmission of its contents outside the United States must
be in compliance with U.S. Export Laws and Regulations.
The bearer of this document is under obligation to know the
applicable restrictions for the dissemination of its contents
that relate to U.S. Export Laws and Regulations or any other
3750 W. Loop 281
Longview, Texas 75604
Page 2
N- Revised table 5-35
L. Shirey
8/2/13
D. Harrison
8/2/13
13463
M – Revised Analog Input Conn
D. Cunningham
3/15/12
D. Harrison
3/15/12
11420
L – Revised for CE Certification
B. Tanner
11/15/11
S. Martinez
11/15/11
10897
K – Table 5-28 Corrections
B. Tanner
8/13/10
D. Harrison
8/13/10
10029
J – NORAD Tracking Appx. K
B. Tanner
5/11/09
W. Black
5/11/09
8676
H – V1000 Updates
B. Tanner
3-23-09
L. Bustamante
3-23-09
8559
G – Appendix J
A. Weaver
5-5-08
K. Kaufman
5-5-2008
7895
F – Encoders, misc
M. Neely
4-25-07
J. Upatham
4-25-007
6540
E – OE Tracking, params
M. Neely
1-12-05
D. Bulgrien
1-12-05
5567
D – parameters corrected
M. Neely
1-04-05
D. Bulgrien
1-04-05
5566
D – Set 0 and -3 dB, amnd
M. Neely
7-21-04
B. Harris
7-21-04
5353
D – Trblshtg. App. updated
M. Neely
6-7-04
D. Harrison
6-7-04
5272
D – ACU Sync added
M. Neely
4-23-04
M. Neibert
4-23-04
5127
C – Numerous updates
M. Neely
10-13-03
D. Harding
10-13-03
4769
B – V4 Software Rewrite
M. Neely
5-16-03
D. Harding
5-16-03
4621
A – First release
M. Neely
2-18-03
D. Harding
2-18-03
4554
Rev. No/change
Revised By
Date
Approved By
Date
ECO#
Revision History
Page 3
NOTICES
WARNING
THE ELECTRICAL CURRENTS AND VOLTAGES IN THIS EQUIPMENT ARE DANGEROUS. PERSONNEL
MUST OBSERVE SAFETY REGULATIONS AT ALL TIMES.
This manual is intended as a general guide for trained and qualified personnel who are aware of the
dangers of handling potentially hazardous electrical and electronic circuits. This manual is not intended
to contain a complete statement of all safety precautions that should be observed by personnel in
using this or other electronic equipment.
WARNING
IN CASE OF EMERGENCY BE SURE THAT POWER IS DISCONNECTED.
The manufacturer has attempted to detail in this manual all areas of possible danger to personnel in
connection with the use of this equipment. Personnel should use caution when installing, operating,
and servicing this equipment. Care should be taken to avoid electrical shock, whether the hazard is
caused by design or malfunction.
WARNING
ALWAYS DISCONNECT POWER BEFORE OPENING COVERS, ENCLOSURES, PANELS, OR SHIELDS.
ALWAYS USE GROUNDING STICKS AND SHORT OUT HIGH VOLTAGE POINTS BEFORE SERVICING.
NEVER MAKE INTERNAL ADJUSTMENTS OR PERFORM MAINTENANCE OR SERVICE WHEN ALONE
OR FATIGUED.
The manufacturer is specifically not liable for any damage or injury arising from improper procedures
or failure to follow the instructions contained in this manual or failure to exercise due care and caution
in the installation, operation, and service of this equipment or use by improperly trained or
inexperienced personnel performing such tasks. During installation and operation of this equipment,
local building codes and fire protection standards must be observed.
All computer software, technical data, or other information pertaining to the equipment covered by this
manual is proprietary to General Dynamics. Such information is transmitted in this manual or related
documents for the benefit of General Dynamics customers and is not to be disclosed to other parties
verbally or in writing without prior written approval of General Dynamics. Additionally, this manual
may not be reproduced in whole or in part without written consent from General Dynamics.
APPENDIX A Acronyms and Abbreviations ..................................................... A-1
APPENDIX B 7200 ACU Password Protection ............................................... B-1
APPENDIX C Two Speed Resolver Calibration ................................................ C-1
APPENDIX D Tracking Tutorial for Operators .................................................. D-1
APPENDIX E 7200 Troubleshooting Guide ..................................................... E-1
APPENDIX F Site Acceptance Test Procedure .................................................F-1
APPENDIX G Graphical Menu Tree ................................................................ G-1
APPENDIX H Vendor Data ............................................................................ H-1
APPENDIX J Field Procedure to Install CTB055 ...............................................J-1
APPENDIX K NORAD Tracking ..................................................................... K-1
APPENDIX L Addendum Notes for CP/LP-PATH Option .................................... L-1
iv
Page 9
Introduction
1.0 INTRODUCTION
1.1 Purpose
This manual provides the user with the information necessary to install and operate
the General Dynamics SATCOM Technologies (GDST) Model 7200 Antenna
Control System (ACS). Failure to follow the instructions and all cautions and
warnings provided in this manual may result in improper installation and/or
operation of the 7200 ACS.
1.2 Scope
This manual primarily contains the information related to the 7200 ACS, and
includes limited information about the antenna structure, the equipment used to
develop the tracking signal, and other equipment peripheral to the 7200 ACS.
1.3 Organization of Included Contents
This manual is divided into the following sections:
•Section 1.0, Introduction, gives the purpose, scope, and organization of this manual.
Information for obtaining technical support is also included in this section.
•Section
specifications, the functions of the system, and a description of the controls and indicators.
• Section
• Section
connections of system cabling and explaining the setup and initial power-up of the system.
•Section
ACS.
• Section
• Section
the drive cabinet.
•Appendix A, Acronyms and Abbreviations, lists the definitions of all acronyms and
abbreviations used in this manual.
•Appendix B, 7200 ACU Password Protection, provides information to set, change, and clear
user passwords from the 7200 ACS. It also provides information to disable password
protection on the system.
•Appendix C, Two-Speed Resolver Calibration, provides instructions for calibrating the two-
speed resolvers in the 7200 ACS.
2.0, Overview of the 7200 ACS, provides a general overview of the system, including
3.0, Theory of Operation, explains the theory of operation of the 7200 ACS.
4.0, Installation, provides instructions for installing the 7200 ACS, showing the
5.0, Operation, provides detailed information for configuring and operating the 7200
6.0, Maintenance, provides information necessary for maintaining the 7200.
7.0, Engineering Drawings, contains the engineering drawings for the 7200 ACU and
1-1
Page 10
Introduction
•Appendix D, Tracking Tutorial for Operators, provides instructions for quickly setting up
tracking with the 7200 ACS, eliminating the need to read the step-by-step instructions in
Section 5.0 of the manual.
•Appendix E, 7200 Troubleshooting Guide, contains probable causes and corrective action for
troubleshooting the 7200 ACS.
•Appendix F, Site Acceptance Test Procedure, contains the final proof of acceptance procedure
for the antenna control system.
•Appendix G, Graphical Menu Tree, contains a graphical menu tree that depicts all menus and
parameters for the system.
1.4 Supplemental Literature on CD and Website
Related documentation that is highly specialized or infrequently used has been
included on an enclosed Compact Disc. This information is also maintained on the
General Dynamics SATCOM Technologies website at http://www.gdsatcom.com.
This manual and all its various appendices have also been included on the CD. In
addition, documentation for prior generation (legacy) systems is included.
CG-0281 – Factory Test Proc. – 7200 (VCPU)
CG-0282 – Factory Test Report – 7200 (VCPU)
CG-0283 – Factory Test Proc. – VCPU
CG-0284 – Factory Test Report – VCPU
7 in H (17.8 cm) x 19 in W (48.3 cm) x 19 in D (48.3 cm)
1.4 Technical Support
The 7200 Antenna Control Unit (ACU) contains context-sensitive, on-line help that
is easily accessible from any menu or submenu in the system by simply pressing
the [HELP] key on the 7200 ACU's front panel. For operational problems, a
troubleshooting guide is provided in Appendix E of this manual.
If any questions or problems arise that are not addressed by the manual or the
online help (provided by pressing the [HELP] key), please contact our technical
support team.
1. Email us at LV_CustomerService@gdsatcom.com.
2. Phone us at (903) 295-1480.
1.5 Important Safety Information
1.5.1 Explanation of Safety Symbols
Symbol Explanation
Protective Earth/Ground Terminal
Caution, Risk of Electric Shock
Caution, Risk of Danger.
Consult accompanying documents.
1.5.2 Technical & Environmental Specifications
ACU Mass 26 lbs (11.8 kg)
ACU Maxi mum Power 75 VA
ACU Maximum Operating Altitude 10,000 ft (3,048 m)
1.5.3 User Supplied Power Cord Requirements
If the factory supplied power cable for the ACU is not available, a user supplied
power cord may be used provided it meets the following criteria: #18 AWG, 10A.
The Belden 17742C/10 or equivalent power cord for example is recommended.
1-3
Page 12
Introduction
1.5.4 Note about connecting/disconnect from mains power.
The main power source supplying power to the rack that the 7200 Antenna
Control Unit is installed in should be easily accessible for disconnect should an
equipment fault occur.
1-4
Page 13
Introduction
THIS PAGE INTENTIONALLY LEFT BLANK
1-5
Page 14
Page 15
Overview
2.0 OVERVIEW OF THE 7200 ACS
2.1 General Information About the 7200 ACS
The 7200 ACS is an antenna pointing system, controlled manually or
automatically, that positions the antenna to receive the peak signal from one or
more communications satellites. The 7200 ACS uses microprocessor technology to
provide accurate antenna positioning, high reliability, and maximum system
flexibility. The system has the capabilities for rapid multiple satellite access, highly
sophisticated predictive tracking with inclined orbit satellites, and EIA/TIA-232E,
EIA/TIA-422B, IEEE-488 (Optional) remote control communications, and 10BASE-T
Ethernet.
In two-axis applications, azimuth (AZ) and elevation (EL) controls are used to
position the antenna. The three-axis applications use AZ, EL, and polarization (POL)
controls to position the antenna and feed assembly. The four-axis applications use
AZ, EL, and two polarizations (POL & 4TH AXIS) to control the position of the
antenna and feed assembly. Variable speed inverters provide two-speed operation
for AZ and EL with continuously variable drive rates over a range of approximately
50 to 1. The 7150 Drive Cabinet houses the drive controls and interfacing
equipment to the 7200 ACS. The 7150 Drive Cabinet is normally mounted on the
antenna foundation.
A large 8-inch by 4-inch electro-luminescent display and a sensible, uncluttered
keypad form a user interface which is fully menu-driven and includes contextsensitive help messages. With much detail paid to the man-machine interface, the
7200 ACU provides straightforward access to an extremely versatile ACS.
The 7200 offers a number of operational modes including manual jog control,
several programmed positioning modes, "conventional" steptrack, and the
revolutionary Orbit Prediction Track (OPT) mode. OPT provides tracking
performance approaching that of monopulse control systems by combining efficient
steptrack operation with advanced orbital propagation algorithms to produce a
state-of-the-art, predictive tracking method. With OPT, the 7200 provides highly
accurate tracking with minimal initial data (approximately 1.25 hours for initial
model development).
Two-speed motor control is provided as standard equipment, not through the use
of expensive clutched arrangements or dual-wound drive motors, but with standard
three-phase induction motors, controlled by solid-state variable frequency inverters.
This approach not only provides a reliable and cost-effective means of two-speed
operation (with ratios of up to 50 to 1), but also allows for more precise
positioning than conventional Alternating Current (AC) motor control systems
which simply use contactors to switch motor power on and off. This is a result of
the ability of the inverter to "ramp" the motor speed up or down in a controlled
manner rather than simply removing motor power while at full speed. This can
result in uncontrollable coasting and inevitable "overshoot" of the target.
2-1
Page 16
Overview
FEATURE
DESCRIPTION
th, RMS, in Steptrack mode.
Nominally 5% of receive 3 dB beamwidth, RMS, with valid model in OPT mode
(independent of orbit inclination).
An optional cable allows the user to remotely control the antenna axes, using the
Portable Maintenance Control Unit (PMCU) located in the 7150 drive cabinet.
2.2 System Specifications
As shown in Table 2-1, the 7200 ACS has specifications that reflect performance
sufficient for virtually any communications system antenna, as well as Tracking,
Telemetry, and Control (TT&C) applications. Tracking accuracy within 5 percent of
the receive antenna beamwidth are achievable due to the advantages provided in
the sophisticated OPT modeling. The overall tracking accuracy is related to the
resolution of the angular position display system, which is configured according to
individual system requirements.
TABLE 2-1 7200 ACS SPECIFICATIONS
Nominally more than 10% of receive 3 dB beamwid
Tracking Accuracy
Position Encoding
Front Panel Position
Position Encoding
Input Power
Requirements
ACU Tracking
Receiver Interface
Remote
Communications
Summary Alarm
Output
LSI tracking resolver-to-digital conversion IC's with 0.02° RMS accuracy.
*Additional cabling is available up to a maximum length of 1500 feet
*Two-speed and optical encoding systems cabling requirements specified for each
Page 17
Overview
FEATURE
DESCRIPTION
Humidity - 100% condensing.
TABLE 2-1 7200 ACS SPECIFICATIONS
Antenna Control Rack-mounted Unit:
Temperature - 0°C to + 50°C; Humidity - 90% non-condensing
Environmental
Specifications subject to change without notice.
Drive Cabinet:
Temperature (Standard) -10°C to +50°C
Temperature (Optional) -40°C to +50°C (Low temperature package)
2.3 System Configuration
Refer to Figure 2-1 for a typical overall block diagram of the integrated control
system. Items shown with solid interconnection lines represent fundamental
system components that provide automatic positioning for a two-axis system.
Items connected with a dashed line represent typical system options such as a
tracking receiver, POL motorization components, Customer-Furnished Equipment
(CFE), and remote Monitor and Control (M&C) equipment.
Figure 2-1 Typical 7200 ACS Block Diagram
2-3
Page 18
Overview
The standard main input voltage for the drive cabinet is either 208 VAC threephase WYE, or 380 - 415 VAC three-phase WYE requiring a four-wire circuit plus a
ground conductor. The actual current/power requirements for a given system are
essentially established by the drive motor characteristics with only a small portion
being used for control logic power. Other input voltages and frequencies are
available as options, as is single-phase input power (the drive motors remain threephase in this case as the inverter modules perform the required conversion). The
input power wiring connects to pressure-type lug terminals on the main circuit
breaker housing inside the drive cabinet.
NOTE: In all cases, power wiring to the drive cabinet
must be sized for the rated currents and voltage drop and installed
by qualified personnel in accordance with local codes.
Power for each of the drive motors is supplied from the drive cabinet through
double insulated cables which are run through conduit and other enclosures serving
as cable plenums and pull boxes. The motor power conductors connect to
pressure-type lugs on terminals in the drive cabinet and in the motor junction
boxes. Motor power wiring is sized for rated currents and voltage drops and is
protected by overcurrent devices as defined by the regulations of the National
Electrical Code (NEC), International Electrotechnical Commission (IEC), and
Institute of Electrical and Electronic Engineers (IEEE).
Overtravel limit switches for each axis are interfaced with the drive cabinet via
double insulated control cabling. In the drive cabinet, drive interlock logic is
provided for each direction of travel and a summary limit alarm is developed and
provided to the ACU for display. The limit switch cables connect to pressure-type
terminals at each limit switch and in the drive cabinet.
Axis drive commands and drive cabinet status signals are passed between the ACU
and drive cabinet through a 25 conductor, #22 AWG cable with a maximum length
of 1500 feet. The cable connects to a pressure-type terminal strip in the drive
cabinet and terminates into a 25-pin female D-connector at the rear of the ACU.
The AZ, EL, and POL (three-axis systems) and AZ, EL, POL and 4TH AXIS (fouraxis systems) transducers interface directly with the ACU via a shielded
multiconductor cable for each device. The standard configuration includes singlespeed, brushless resolvers that require three twisted pair cables. The cables
terminate to flying leads at the resolver via solder or positive crimp connections
and terminate into male D-connectors at the ACU end (25-pin for AZ and EL; 9-pin
for POL). Other types of position transducers, including high accuracy two-speed
resolvers and absolute optical encoders, are available as options to accommodate
critical antenna pointing accuracy requirements or to provide additional resolution
for narrow beamwidths.
2-4
Page 19
Overview
In applications requiring closed-signal-loop tracking (Steptrack and OPT), a serial
connection between the General Dynamics DTR tracking receiver and the 7200
ACU provides the ACU with the beacon signal level. Alternatively, an analog
tracking signal is accepted through the ACU rear panel via J21 (a 9-pin Dconnector). The nominal tracking voltage input is in the range of 0 to 10 VDC,
with a slope of 0.2 V/decibels (dB) to 1.0 V/dB. Beacon select outputs are
provided on a 7200 ACU rear panel terminal strip (TB1), allowing remote manual or
automatic beacon selection with General Dynamics tracking receivers.
Full function remote control of the tracking system is facilitated through the
10BASE-T Ethernet port or one of the serial ports (both EIA/TIA-232E and EIA/TIA422B are provided). An IEEE-488 (also known as GPIB), interface is also available
as a factory option.
A summary alarm contact is provided on the ACU rear panel user interface terminal
strip TB1. The contact can be wired to a warning light, buzzer or M&C interface to
alert the station operators that the 7200 ACU has a summary fault condition.
2.4 System Hardware
The 7200 ACS consists of the following subsystems:
• Model 7200 ACU
• 7150 Drive cabinet
• Position Feedback Devices
The system interfaces with three-phase induction motors for AZ and EL positioning
and a single-phase AC synchronous stepping motors for POL rotation. Limit
interfaces are for normally closed switches that open upon engagement.
2-5
Page 20
Overview
Front Panel Display Assembly
Rear Panel PCB
Keyboard Controller PCB
One Power Supply
Digital I/O Daughter PCB
VCPU PCB
Optical Encoder PCB (Optional)
Single/Dual-Speed RDC PCB (Optional)
Optical Encoder I/O PCB (Optional)
2.4.1 7200 ACU Hardware
The Model 7200 ACU is a technically advanced, specially designed, multitasking
embedded control computer that includes input and output circuitry sufficient for
interfacing with all other related tracking system components. The ACU hardware
is based upon the industrial Versa Module Europe (VME64 (VITA 1-1994)) bus
architecture, providing extreme versatility and reliability far above many other
hardware platforms. Several printed circuit cards and peripheral subassemblies,
described in subsequent sections, are integrated in a custom chassis to comprise
the ACU. The primary components of the 7200 ACU are:
•
•
•
•
•
•
•
The 7200 ACU front panel is shown in Figure 2-2. The 7200 ACU functional block
diagram is shown in Figure 2-3. Figures 2-4 and 2-5 show the top and side view
of the ACU respectively. (Refer to the engineering drawings in Section 7.0)
•
•
Figure 2-2 7200 Antenna Control Unit Front Panel
2-6
Page 21
Overview
Figure 2-3 7200 ACU Functional Block Diagram
2-7
Page 22
Overview
Figure 2-4 7200 Antenna Control Unit Top View
Figure 2-5 7200 Antenna Control Unit Side View
2-8
Page 23
Overview
2.4.1.1 VertexRSI Central Processing Unit (VCPU) PCB Assembly
The 7200 ACU uses the Motorola 68030 32-bit microprocessor as the Central
Processing Unit (CPU), providing sufficient computing power for the sophisticated
control and tracking algorithms used by the ACU. A dedicated VME CPU circuit
card is provided, which includes the CPU, Read-Only Memory (ROM), Random
Access Memory (RAM), bus control circuitry, and nonvolatile memory control
circuitry, providing efficient and reliable system operation.
The VCPU card has several indicators and switches mounted on the VME front
panel to provide the user with basic diagnostic information.
Figure 2-6 VCPU Card
D1 Halt LED – This bi-color green/red LED indicates the operational status of the
68030 CPU. If this LED is red the processor is halted and the system will not
operate, consult the factory for assistance. This LED will always be illuminated
green even when the board is held in reset.
D4 Reset LED – This bi-color green/red LED indicates the reset status of the board.
If this LED is red it means the board is in reset. The following events can cause a
reset condition to occur:
1) 2.5 VDC undervoltage fault – If this is the cause then LED D2 (SMT LED
located between the battery and the left hand side of the board) will be
extinguished indicating that the 2.5V power supply source has fallen below
2.38VDC. Check the voltage to ensure it is above 2.38VDC. Potentiometer PT1
sets the threshold for this fault (Re-adjust per General Dynamics document CG-
0283).
2) 3.3 VDC undervoltage fault – If this is the cause the battery monitor IC (U1)
has detected a voltage lower than 2.9 VDC. Check the 3.3V regulator output
(VR1) to see if 3.3V is the output voltage.
3) 5.0 VDC undervoltage fault – If this is the cause then LED D3 (SMT LED
located between the battery and the left hand side of the board) will be
extinguished indicating that the 5.0V power supply source has fallen below
4.75VDC. Check the voltage to ensure it is above 4.75VDC. Potentiometer
PT2 sets the threshold for this fault (Re-adjust per General Dynamics document
CG-0283).
4) Dip Switch S6 pos 6 in the ON position – Leaving this dip switch in the ON
position holds the board in reset; change the position of the switch to the OFF
position to allow the board to operate normally.
2-9
Page 24
Overview
S2 SWITCH POSITION
DESCRIPTION
up, run the MONDO Monitor program. MONDO is a low level monitor
up, test and program a new 7200
5) Momentary Pushbutton switch S1 is pressed – This switch is spring loaded so
it should not be able to remain pressed in (which will hold the board in reset);
however, if it were to be held in place by something mechanically binding it,
then the board would remain in reset; press the reset push button switch S1
several times to ensuring that it is springing back out with each release.
Reset Switch S1 - The momentary reset switch allows the user to reset the system
CPU. Resetting the board is similar to cycling the power on the unit except the
main RAM bank of memory on the board is not erased (as it is when the power is
cycled). This reset switch is mainly used by General Dynamics software
development personnel but can also be used by site operators when
troubleshooting.
Hex Rotary Switch S2 – This rotary switch is used to determine which firmware to
run when the system is powered on. The VCPU contains enough flash memory to
hold four unique versions of application code (each of these four allocations in
memory is referred to as a boot bank). This is useful when upgrading the 7200
ACU firmware because the new image can be uploaded to another boot bank, the
rotary switch can be changed, and the ACU can be booted up with the new
application firmware without erasing the original factory supplied application code.
The rotary switch positions and their respective functions are defined in the table
below:
0 (Factory Setting) On power-up, run the application firmware contained in boot bank 0.
1 On power-up, run the application firmware contained in boot bank 1.
2
3
4 - D Unused (currently these positions are treated like position E).
E
F
On power-up, run the application firmware contained in boot bank 2.
On power-up, run the application firmware contained in boot bank 3.
On powerprogram used by General Dynamics to powerACU. MONDO uses an ASCII based protocol to interface with a PC via a terminal
program via serial port 0 (front panel display or serial port 1 – J14 on the rear of the
7200).
On power-up, run the Swift X talker (Used by General Dynamics software developers
only)
Hex Rotary Switch S3 – This rotary switch is used to determine which self-test the
VCPU will run when powered up. The VCPU contains self test code which are
divided into three categories:
1) Destructive Tests – These tests erase memory, which would cause the user to
have to reload the parameters and application code.
2) Independent Tests – These tests can be run without the need for external test
cables and other test hardware. The following circuits are functionally tested:
floating point coprocessor, real time clock, serial ports (loopback internal to the
2-10
Page 25
Overview
S3 SWITCH POSITION
DESCRIPTION
S6 SWITCH POSITION
OFF POSITION (SWITCH OPEN)
ON POSITION (SWITCH CLOSED)
S4 SWITCH POSITION
OFF POSITION (SWITCH OPEN)
ON POSITION (SWITCH CLOSED)
UART), CPU interface to the Ethernet controller microcontroller, the rotary
switches S2, S3 and the dip switch S4.
3) Dependent Tests – These tests require special test jigs and are run by factory
personnel to verify operation of the system.
This self-test code is only run if DIP switch S4 pos 8 is in the ON position. To
prevent against “accidentally” running these tests, the tests are also interlocked
with the Keyboard controller card. If the keyboard controller card is detected, the
tests will be aborted. The serial port between the keyboard controller card and the
display controller card should be unplugged to allow the tests to proceed.
0 (Factory Setting) On power-up, no self-test code is run.
1 On power-up, the destructive suite of tests is run.
2
3
4 - E Unused.
F On power-up, run all tests sequentially.
On power-up, the independent suite of tests is run.
On power-up, the dependant suite of tests is run.
DIP Switch S6 – This DIP switch directly controls various hardware related board
functions as defined in the following table:
TABLE 2-4 VCPU S6 DIP SWITCH POSITIONS DEFINITION
1 - 4
5
6
7
Flash Write Disabled ♦♥
EEPROM Write Disabled♦
Normal Operation♦
CPU Watchdog Disable♦
8 Board Reset Disabled
♦ Denotes the normal operating position of the switch (factory setting).
♥To program the flash boot banks with new application code, S6 pos 1-4 must be in the ON position; after programming is
complete, return these four switches to the OFF position.
Flash Write Enabled
Hold the VCPU board in Reset
CPU Watchdog Enable
Board Reset Enabled♦
DIP Switch S4 – This DIP switch controls various software functions as defined in
the following table.
♦ Denotes the normal operating position of the switch (factory setting).
♠ Enabling self-test mode should ONLY be performed when directed to do so by General Dynamics technical support. Some
of the self-tests erase NVRAM (parameter storage space) and some erase all the flash banks (application firmware).
Resets all params to factory defaults on Boot
2-11
Page 26
Overview
Potentiometer PT3 – The analog input circuit contains an AGC gain amplifier. The
gain of this amplifier is adjusted by PT3. To use the AGC gain amplifier, the shunt
plug on 201358-01 site J4 must be moved from the “Bypass” position (factory
setting) to the “Gain” position. Refer to the A/D Calibration section of General
Dynamics Document #CG-0283.
2-12
Page 27
Overview
Description
Typical
Calculated Worst Case
Potentiometer PT4 – The analog input circuit contains a zero offset calibration
potentiometer PT4. Refer to the A/D Calibration section of General Dynamics
Document #CG-0283.
Potentiometer PT5 – The analog input circuit contains a gain calibration
potentiometer PT5. Refer to the A/D Calibration section of General Dynamics
Document #CG-0283.
Table 2-6 provides miscellaneous performance specifications that are inherent to
the VCPU board.
TABLE 2-6 VCPU PERFORMANCE SPECIFICATIONS
Real Time Clock Accuracy
(A TCXO drives this clock)
NVRAM Battery Backup Shelf Life
(external power source off)
NVRAM Battery Backup
Normal Operation (external power
source operational)
Battery Change Period (without
NVRAM corruption) *
* A capacitor keeps the NVRAM powered while the battery is being replaced. This row in the table defines the minimum
amount of time that the discharging capacitor will keep the NVRAM powered without the battery present.
+/- 0.16 Seconds/Day
24 Months
-
>45 Seconds >21 Seconds
+0.26 to –0.42 Seconds/Day
(@ 0-50 Degrees C)
15 Months
(@ 0 Degrees C)
90% capacity after 10 years due to
self discharge
(@ 25 Degrees C)
2.4.1.2 User Interface
One of the most striking and advanced features of the 7200 ACU is the user
interface, which combines an 8-inch by 4-inch electroluminescent display with a
custom 24-station keypad to provide the most straightforward, powerful, and userfriendly operating platform in the industry. As shown in Figure 2-2, the 7200 ACU
front panel layout is uncluttered and offers a logical format for the display of
information. For more information on the user interface refer to Section 2.5.1.
2.4.1.3 Digital Input/Output Printed-Circuit Board Assembly
The I/O PCB provides the electrical interface between the ACU and the drive
cabinet. In addition, the I/O card serves as the interface between the CPU and the
ACU rear panel status inputs and control outputs. There are a total of 24 digital
inputs (some inputs are used internally so all 24 are not available through the rear
panel connectors). See table 2-7 for the digital inputs specifications.
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CONNECTOR TB1 ONLY
CONNECTORS J10 & J11
TABLE 2-7 7200 DIGITAL I/O SPECIFICATIONS
DIGITAL INPUTS DESCRIPTION
Voltage Levels
Input Impedance 10 K Ohms (Nominal)
Transient Voltage Suppression
DIGITAL OUTPUTS
Output Type Relay Contact Closure
Maximum Input Voltage 220 VDC or 125 VAC RMS
Maximum Load Current 1 Amp
Maximum Switched Power 62.5 VA
DIGITAL I/O
Output Type Open Collector Transistor
Maximum Input Voltage 26.7 VDC
Maximum Load Current 500 mA
Transient Voltage Suppression
Specifications subject to change without notice.
Logic Level High Voltage Range: (+4.5 to +26.7 VDC)
Logic Level Low Voltage Range: (0 to +1 VDC)
Electrostatic discharge (ESD) as defined in IEC 1000-4-2,
Electrical fast transients (EFT) per IEC 1000-4-4
Electrostatic discharge (ESD) as defined in IEC 1000-4-2,
The Resolver-to-Digital Converter (RDC) PCB accepts analog inputs from the
antenna-mounted AZ, EL, and/or POL resolvers (via the rear panel termination
circuit card) and provides a binary digital encoded representation of the pointing
angles for each axis to the CPU. VME bus interface circuitry is included, based
upon CPU and RDC timing requirements. The standard configuration is for singlespeed resolvers and 16-bit encoding; however, the RDC PCB can be configured to
accept dual-speed resolver inputs and provide higher resolution as required.
Alternate means of position encoding are available, including high accuracy
absolute optical encoders, in which case an alternate position interface circuit card
is provided.
2.4.1.5 Optical Encoder Daughter Board (Optional - AZ and EL)
The OE daughter card is mounted on its own VME card. This card takes the EIA422A serial encoder data and converts it to 24 bits for use by the CPU. Two
Complex Programmable Logic Devices (CPLDs) are employed to convert the buffered
serial data to parallel data for use by the CPU. The card reads each encoder about
4000 times per second. The bits of position resolution are dependant on the actual
optical encoder used, however, most optical encoder systems have 18 bits of
resolution.
The Resolver-to-Digital Converter (RDC) PCB accepts analog inputs from the
antenna-mounted resolvers (via the rear panel termination circuit card) and provides
a binary digital encoded representation of the pointing angles for the POL and 4TH
AXIS to the CPU. VME bus interface circuitry is included, based upon CPU and
RDC timing requirements. The standard configuration is for single-speed resolvers
and 16-bit encoding.
2.4.1.7 IEEE-488 Interface (Optional)
The IEEE-488 bus has been optionally incorporated into the 7200 ACU to
accommodate users wishing to utilize this type of interface. The IEEE-488 bus
allows connectivity between different programmable devices with a standard
interface for communications between each instrument. The IEEE-488 interface is
also known as GPIB (General Purpose Interface Bus) or HPIB (Hewlett Packard
Interface Bus), and is electrically similar to IEC-625. Please refer to document CG6041 for M&C protocol for this interface.
2.4.1.8 Time and Frequency Processor Board (Optional)
The 7200 ACU clock accuracy can be precisely maintained by utilizing the optional
Time and Frequency Processor Board. This VME board is used in conjunction with
an external (CFE) time source to synchronize the 7200 ACU clock to the accurate
time source. The external time source sends an IRIG-B compliant signal to the J3
BNC connector on the rear of the 7200 ACU. This signal is routed to the Time and
Frequency Processor Board (TFP). The VCPU board acquires only the year from
the on-board real-time clock while the rest of the time/date information is taken
directly from the TFP board. If the TFP board becomes disconnected from its
source, a message will be displayed on the ACU “External Timing Source Lost”.
2.4.1.9 ACU Chassis Assembly
The ACU is housed in a custom chassis assembly which mounts in a standard 19inch Electronics Industry Association (EIA) rack, requiring 7-inches of vertical rack
space (4 Rack Units per EIA 310). The nominal overall dimensions of the ACU
chassis are: 7-inches tall by 19-inches wide by 20-inches deep. The 7200 ACU’s
weight is approximately 27 lbs. A four-slot VME card cage, which houses the
VCPU, I/O, and RDC PCB’s, is mounted to the inside of the chassis top plate. The
top plate is hinged at the rear of the chassis and includes a locking support arm to
facilitate convenient front-side access to the card cage. Studs connected to the
front panel support the front panel display and keypad and their respective control
circuit cards.
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AC POWER INPUT
DESCRIPTION
A VME backpanel PCB serves as the bus interface and DC power supply
distribution system for the CPU and RDC PCB’s. Two of the four slots are available
for future expansion and/or customized features and factory options.
A PCB mounted to the ACU rear panel accepts all external wiring and connectors
(with the exception of the line cord) and serves as a “break-out” device with
connections to each of the circuit boards in the card cage.
Two cooling fans are provided to ensure operation of the ACU internal components
remain well within device ratings. The fans are powered from the +24 V output of
the power supply.
2.4.1.10 Power Supply, EMI Filter and Fuse
Power for all ACU components is provided by one power supply assembly, which
is mounted to the bottom plate of the chassis. This power supply is a quad
output, switched mode type, providing output voltages of +5, ±12 and +24 VDC
for all logic and control circuits. Nominal power requirements for the ACU are 75
VA at 100 to 240 VAC, 50 or 60 Hertz (Hz).
The power supply used in the 7200 ACU has an automatic shutdown feature in
case over-current conditions occur. The system also has a line fuse on the rear
power entry module in case of a ground fault. An input line-conditioning filter
provides Electromagnetic Interference (EMI) suppression.
TABLE 2-8 7200 POWER INPUT SPECIFICATIONS
Input Voltage Range 100 to 240 VAC Nominal
Input Power Requirements 75 VA Typical
Input Surge Current 25 Amps Max. @ 25 degrees C
Input Power Factor 0.98 Typical (Active Power Factor Corrected Supply)
Input Frequency Range 50 to 60 Hz Nominal (47-63 Hz Max.)
Fuse Current Rating 2 Amps
Fuse Type 5 x 20 mm Time Lag Fuse (Slo-Blo Type Fuse) per IEC 60127-2 Sheet 3
Specifications subject to change without notice.
2.4.2 Antenna Drive Cabinet Hardware
The standard motor drive cabinet is a freestanding, foot-mounted aluminum NEMA4X enclosure with overall dimensions of approximately 36-inches tall by 30-inches
wide by 10-inches deep (91.4 cm tall by 76.2 cm wide by 25.4 cm deep). The
aluminum cabinet provides outstanding corrosion protection even in the harshest of
environments. The cabinet weighs approximately 150 lbs. (68 kg) and is
operational in altitudes of up to 10,000 ft. (3,048 m). The input power to the
cabinet can vary according to the particular drive cabinet that was ordered with
your system; please see the specific system documentation for more information.
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A functional block diagram of the drive cabinet is shown in Figure 2-7.
Figure 2-7 Drive Cabinet Block Diagram
The drive cabinet consists of the following major components:
• Portable Maintenance Control Unit
• Main and Inverter Drive Circuit Breakers
• EMERGENCY STOP SWITCH
• AZ Variable Speed AC Drive Unit (Inverter)
• EL Variable Speed AC Drive Unit (Inverter)
• 24 VDC Power Supply
• Control Circuitry for the POL Motors (In Three-Axis and Four-Axis Systems)
Figure 2-8 shows the major components of the drive cabinet. Refer to the
engineering drawings in Section 7.0.
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GPD 315
GPD 315
Figure 2-8 Drive Cabinet Assembly
The Portable Maintenance Control Unit (PMCU) located inside the 7150 Drive
Cabinet allows the operator to control antenna movement from the proximity of
the antenna.
The MAIN CIRCUIT BREAKER controls the main power to the drive motors, the
limit switches, and the drive cabinet, but does not provide power to the 7200
ACU. Each inverter has an individual circuit breaker for protection. This circuit
breaker will cut off mains power to the cabinet, but mains power can also be
installed in such a way that it can be cut off external to the cabinet if necessary.
The EMERGENCY STOP switch (on the outside of the drive cabinet), when
pressed, removes power from the drive motors by opening the drive enable
contactor.
The AZ and EL inverters provide pulse-width-modulated motor current, allowing
continuously variable drive rates over a range of up to 50 to 1.
The 24 VDC power supply provides operating voltage to the drive cabinet relay
circuit board.
Relay PCB accepts all limit switch status inputs and controls the commands to the
inverter drives and the POL motors.
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2.4.2.1 AZ and EL Drive Inverters
One of the critical advantages of the 7200 ACS over many other systems is the
use of variable frequency drive inverters to control the speed of standard threephase induction motors for AZ and EL antenna motion. This approach has several
distinct advantages over the commonly used and simplistic on/off contactor control
of motor power. First, inverters allow General Dynamics to offer two-speed
control in a standard configuration without the problems associated with special
dual-wound motors or clumsy clutching arrangements. Secondly, the inverters
offer precision motor control by ramping motor speeds up and down in a controlled
manner rather than simply switching full motor power on and off and having to
contend with inertial coasting of the motor rotor and the related axis overshoot. In
addition to these two distinct advantages, the inverter drives offer superior motor
protection through sophisticated electronic motor overcurrent protection. Motor
current is continuously monitored and compared against allowable levels for
different conditions. Should the actual measured current exceed the allowable
levels, the inverter trips and the drive is disabled. The inverter then has the
capability to automatically reset and continue operation, provided the current
remains within allowable limits.
2.4.2.2 Polarization Motor Control (POL and 4th Axis)
A three-axis system uses a single-speed AC synchronous stepping motor for feed
assembly rotation (POL). In the four-axis system a pair of single-speed AC
synchronous stepping motors are used for feed assembly rotation. Both POL
motors are controlled and powered from the 7150 drive cabinet. Drive power to
the POL motor(s) is switched, according to the required direction of rotation, by
relays located on the Relay PCB. A resistance-capacitance (RC) network in the
drive cabinet provides the proper phase relationship to each motor.
2.4.2.3 Drive Cabinet Control Logic
Motor drive commands and interlock functions in the drive cabinet are performed
with relay logic operating at +24 VDC, which is derived from a regulated power
supply. Commands can be received from the ACU, or PMCU, for motor speed and
direction. The Drive Reset is controlled from the Relay PC board and the
EmergencyStop is located on the right side of the enclosure. The drive cabinet
relay logic then commands the axis drives accordingly. Likewise, limit switches
mounted on the structure activate relays in the drive cabinet upon engagement to
form axis interlocks and provide the appropriate fault reporting to the ACU.
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2.4.2.4 Local Control
Local (Maintenance) control of the antenna drives is facilitated through a set of
switches on the PMCU in the drive cabinet. A MAINT/REMOTE switch located on
the Relay PCB allows the operator to select between ACU control and local drive
cabinet control. With the select switch set to the MAINT position, ACU control is
disabled; however, all status reporting remains fully operational at the ACU.
2.4.2.5 Drive Cabinet Overcurrent Protection
As described in Section 2.4.2.1, "intelligent" electronic overcurrent protection is
provided for AZ and EL drive motors by the variable frequency inverters. In
addition, there are several other protection devices integral to the drive cabinet.
The inverter inputs are individually protected by circuit breakers, offering shortcircuit protection in the event of a drive inverter catastrophic failure. The +24
VDC logic power supply has a line input circuit breaker for short circuit protection.
In three-axis and four-axis systems, the POL motor circuit(s) is individually
protected by a circuit breaker. A main input power circuit breaker is also provided,
which serves as an internal disconnect for the entire cabinet.
2.4.2.6 AZ and EL Drive Motors
Three-phase induction gearmotor assemblies are utilized for actuation of the AZ
and EL axes. The motors are sized based upon deadweight, frictional, and windloading requirements, as well as the required axis velocities. The standard motors
can be connected for either 208 or 380 - 415 VAC three-phase input, based upon
the line voltage available to the drive cabinet. The motors have sealed, permanent,
synthetic grease lubricated bearings and the gearboxes are lubricated with
synthetic gear oil, minimizing maintenance requirements.
2.4.2.7 Absolute Position Transducers
Angular position feedback is provided by absolute position transducers (resolvers)
for each axis. The standard configuration includes size 11 single-speed, brushless
resolvers which, combined with the position encoding circuitry in the ACU, yield an
accuracy of 0.02 degrees, root mean square (RMS). The resolver reference voltage
for the standard devices is 4.6 V RMS, at 2500 Hz.
Encoding system options include electrically wound two-speed resolvers or
absolute optical encoders to provide increased resolution and accuracy. With the
two-speed option, an overall control system accuracy of 0.01-degree peak error is
achieved. In this configuration, dual monolithic resolver-to-digital conversion IC's
are used in the ACU with bit rotation techniques incorporated to significantly
increase binary resolution. Various optical encoder configurations allow for
resolution and accuracy levels commensurate with the most demanding system
applications.
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2.4.2.8 Axis Overtravel Limit Switches
Overtravel is prevented in each direction for each axis of rotation by electrical limit
switches with normally closed (open upon limit engagement) contacts. The
switches are designed with double break contacts such that movement of the
switch actuator in either direction opens a corresponding set of discrete contacts.
In this manner, only one limit switch assembly is required for each axis. Each
switch is mounted with brackets, including adjustable strikers for each direction of
travel.
2.4.2.9 Drive Cabinet Low-Temperature Option
The standard 7200 ACS drive cabinet is rated to operate in an outside ambient
temperature range of 14° F (-10 °C) to 122° F (+50 °C). For systems where the
ambient temperature will fall below 14° F (-10 °C), an optional low-temperature
package is available for the drive cabinet.
For the low-temperature option package, a 200 watt forced air convection heater
with integrated fan and wall insulation are installed inside the drive cabinet. Over
current protection is provided by an individual circuit breaker sized to the wattage
and input voltage of the heater. When the thermostat inside the drive cabinet
registers a temperature below 41°F (5°C), the heater is activated and heats the air
inside the drive cabinet. An external thermostat shuts the heater off when outside
air exceeds 41°F (5°C). The heated air maintains the internal temperature of the
drive cabinet to within the standard operating temperature range.
2.5 Controls and Indicators
The controls and indicators for the 7200 ACS are located on the ACU and inside
the drive cabinet. The EMERGENCY STOP button is located on the outside of the
drive cabinet and additional optional emergency stop switches may be provided at
other locations.
2.5.1 7200 ACU Controls and Indicators
The controls and indicators for the ACU are located on the front panel and on the
rear panel. The following sections describe the functions of the ACU controls and
indicators.
2.5.1.1 The Power On/Off Switch
The power on/off switch is located on the rear of the 7200 ACU in the power
entry module. When the switch is set to the on position, power is applied to the
power supply in the ACU.
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Mode Selection
Fault Status
Mode Status
Current Target
Name and
Time
System Control
Point
Tracking Signal
Status & Level
2.5.1.2 The Alphanumeric Display
The 7200 ACU user interface combines an 8-inch by 4-inch electroluminescent
display with a custom 24-station keypad to provide the most straightforward,
powerful, and user-friendly operating platform in the industry. Figure 2-8 shows
each section of the 7200 ACU display, and each section is described in detail in
the following sections.
Current Position
The display is divided into upper and lower sections: the upper section (approximately
60 percent) is dedicated to real-time information display, and the lower section is
used for interactive mode selection, configuration, editing, and help messages. In the
real-time display section, "current pos" AZ and EL angles are displayed in double-size
characters. A user-configurable alphanumeric field to the left of the current position
angles allows for labeling (naming) the display, primarily to aid identification in
multiple-antenna stations. The line of information directly below the current position
information (also double-size characters) identifies the target currently being accessed
by the system. If the system is in the process of moving from one target to another,
or in a program tracking mode of operation, the target (or next position) angles are
also displayed directly below the current position angles.
Immediately below the target name field is a line of information that displays the
current mode of operation and pending modes. The current target shown in Figure 29 is “A” and the mode status line shows that the current tracking mode is OPT.
Shown at the top of the display are current time (Coordinated Universal Time (UTC)
and/or local), user level (Monitor, Operator, or Supervisor) and tracking signal source
and level. Each of these items may be blanked out by the user if not required in a
particular application (refer to Section 5.8.6.14 for information on user interface
options).
Configuration
Editing
Help Messages
Figure 2-9 7200 Antenna Control Unit Display
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System fault status is reported in inverse, double-size characters in the field below
the Tracking mode status line. In the event of multiple fault conditions, the fault
messages are scrolled continuously at approximately one-second intervals. An audible
alarm (if the alarm option is turned on) accompanies any major fault and may be
silenced from the front panel keypad (refer to Section 5.8.6.14 for information on
user interface options). To the right of “UTC”, an asterisk “*” will appear if an
optional time and frequency processor board (IRIG-B) is installed and has locked onto
an external signal at least once (refer to Section 2.4.1.8).
The lower portion of the display allows fully menu-driven selection of control modes,
parameter editing, etc. A logical tree structure provides for easy and efficient system
operation with minimal reliance upon system operation manuals. One item in each
menu is always highlighted by an inverse-video cursor, which is controlled by keypad
direction keys. The [ENTER] key then selects the highlighted item either for activation
or editing. A dedicated [HELP] key and context-sensitive help messages serve to
remind the operator of operational functions.
The display control PCB receives commands from the CPU through a serial link and
provides appropriate decoding and driver functions for illumination of the display.
2.5.1.3 The Keypad
Commands from the keypad are decoded and serialized through a dedicated keypad
control PCB and sent to the CPU through a serial link shared with the display control
serial link. A speaker located on the keypad control circuit board provides an audible
alarm for fault conditions. Refer to Table 2-9 for explanations of the function of each
key.
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NOTE: If the
TABLE 2-9 7200 ACU KEYPAD CONTROLS
CONTROL FUNCTION
Moves the selection cursor up. In one-screen menus, the up arrow moves the cursor from the bottom
item in the right column to the top of the left column, but does not wrap from the top of the left
↑
↓
→
←
PG DN
PG UP
ENTER Selects the currently highlighted item.
PRIOR
MAIN
STOP
RESUME
HELP Provides access to the context sensitive help screens from anywhere in the menu system.
SHIFT Allows the use of the shift functions shown in white letters on the keypad.
+/-
YES/NO
A/B
•
EXP Used for entering exponents into numeric data fields.
column to the bottom of the right column. In menus filling more than one screen, it will return to
previous screens. Also used to toggle between preprogrammed choices for tracking modes, naming
targets, etc. (refer to Section
Moves the selection cursor down. In one-screen menus, the down arrow moves the cursor from the
top item in the left column of a menu to the bottom of the right column one item at a time, but does
not wrap from the bottom of the right column to the top of preceding left column. In menus filling
more than one screen, the down arrow will reveal additional screens of information when it is pressed
from the bottom right position. Also used to toggle between preprogrammed choices for tracking
modes, naming targets, etc. (refer to Section
Moves the selection cursor to the right. In one-screen menus, the right arrow moves the selection
cursor from the left column to the right column, but does not wrap the selection cursor from the right
column to the left column. In multi-screen menus, it will reveal additional screens of information.
Moves the selection cursor to the left. In one-screen menus, the left arrow moves the selection
cursor from the right column to the left column, but does not wrap the selection cursor from the left
column to the right column. In multi-screen menus, it will return to previous screens of information.
When pressed simultaneously with [SHIFT] key, changes display to the next page for multiscreen
menus. Has no effect on single-screen menus.
When pressed simultaneously with [SHIFT] key, changes display to the previous page for multiscreen
menus. Has no effect on single-screen menus.
Returns to the last screen viewed before the user pressed [ENTER] or [HELP]. During in-line editing,
restores data to the value it had before [ENTER] was last pressed.
When pressed simultaneously with the [SHIFT] key, returns to the Main menu.
[MAIN] key is pressed while editing data, all changes that have been made are lost.
Stops movement of the antenna when pressed. Keyboard Stop flashes on the screen in double-size
letters. If the audible alarm is turned on, the alarm sounds until the [SHIFT] and [RESUME] keys are
simultaneously pressed (or Clear/correct system faults is selected).
When pressed simultaneously with the [SHIFT] key, resumes tracking when a tracking mode is
interrupted by keyboard stop.
Used when entering numerical parameters if the range includes negative numbers. Also used to
toggle between Momentary and Sticky keypad mode for the ACU keypad.
Toggles between YES and NO when setting parameters or when changing operating modes for the
system.
Toggles the display between POL only, 4TH AXIS only, and POL and 4TH AXIS (In Four-axis systems
only)
The period is used to enter floating-point numbers or to choose between POL and 4TH AXIS in fouraxis systems.
5.0 of this manual).
5.0 of this manual).
In Manual antenna control mode, moves POL clockwise (CW). Has no other use.
In Manual antenna control mode, moves POL counterclockwise (CCW). Has no other use.
0 - 9
The numeric keys are used for entering numerical data. Hexadecimal digits A - F may be entered by
pressing the [SHIFT] key and 0 - 5, respectively.
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t provides 24 VDC for control
2.5.1.4 Drive Enable Switch
When the DRIVE ENABLE switch is in the out position, it is illuminated, and the drive
motors are enabled through the drive enable contactor. When the DRIVE ENABLE
switch is engaged, and not illuminated, the drive motors are disabled, and a message
is displayed on the screen of the 7200 ACU.
2.5.2 Drive Cabinet Controls and Indicators
The drive cabinet contains the following controls and indicators located on the PMCU
and the Relay PCB. The function of each control is described in Table 2-10.
TABLE 2-10 DRIVE CABINET PMCU AND RELAY PCB CONTROLS
CONTROL FUNCTION
The MAINT/REMOTE switch is located on the Relay PCB. When set to the REMOTE
MAINT/REMOTE
AZIMUTH SPEED
ADJUST
AZIMUTH CW & CCW
SWITCH
ELEVATION SPEED
ADJUST
ELEVATION UP & DN
SWITCH
CONTROL POWER
CIRCUIT BREAKER
CONTROL POWER
LED
MAIN CIRCUIT
BREAKER
DRIVE(S) CIRCUIT
BREAKER
RECEPTACLE
CIRCUIT BREAKER
(if installed)
position, transfers control to the 7200 ACU. When set to MAINT> the PMCU has control
of the system. The remote mode is selected when the switch is in the UP position.
Maintenance mode is selected when the switch is in the DOWN position.
Located on the PMCU. SLEW SPEED/TRACKING SPEED select switch - Selects the AZ
drive speed (functional in MAINT mode only). SLEW SPEED - This speed is programmed in
to the AZ drive and sets the AZ high-speed drive rate. TRACKING SPEED - This speed is
programmed in to the AZ drive and sets the AZ low speed drive rate.
Located on the PMCU, when this switch is turned to CW and held it rotates the Azimuth
in the CW direction at the speed determined by the AZIMUTH SPEED ADJUST Switch
until the switch is released. When the switch is released it returns to center and the
motion ceases. This switch when turned to CCW and held rotates the Azimuth in the
CCW direction at the speed determined by the AZIMUTH SPEED ADJUST Switch until
the switch is released. When released the switch returns to center and the motion
ceases.
Located on the PMCU. SLEW SPEED/TRACKING SPEED select switch - Selects the EL
drive speed (functional in MAINT mode only). SLEW SPEED - This speed is programmed
in to the EL drive and sets the EL high-speed drive rate. TRACKING SPEED - This speed is
programmed in to the EL drive and sets the EL low speed drive rate.
Located on the PMCU. This switch when turned to UP and held rotates the Elevation in
the UP direction at the speed determined by the AZIMUTH SPEED ADJUST Switch until
the switch is released. When the switch is released it returns to center and the motion
ceases. This switch when turned to DN and held rotates the Elevation in the DN direction
at the speed determined by the AZIMUTH SPEED ADJUST Switch until the switch is
released. When released the switch returns to center and the motion ceases.
Provides circuit protection for the DC power supply tha
circuits.
The Light-Emitting Diode (LED) is located on the Relay PCB and illuminates green when
power is ON.
Provides circuit protection for entire drive cabinet power circuits.
Provides individual circuit protection for each drive.
Provides circuit protection for the duplex utility outlet on the leg of the drive cabinet.
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2.6 System Functions
The 7200 ACS offers a full complement of standard antenna position control modes
as well as a number of advanced tracking modes. For automatic tracking, the 7200
ACS incorporates a new approach to control system operation with a unique targetoriented environment, which provides for the establishment of unique system
characteristics for multiple targets (satellites). In this manner, each target to be
accessed is user-configured with tracking mode, tracking signal frequency and slope,
etc. A target-specific data base is established for any predictive or programmed
tracking data relative to the target. Once configured, tracking for a target is initiated
and maintained in a fully automatic manner simply by invoking the "name" of the
target. This greatly enhances normal operation of the system by reducing the level
of required operator expertise and intervention.
Configuring a target includes the establishment of an operational mode to be used for
accessing that target. The following sections describe the available control modes
for the system in some detail. It should be noted that configuration of a new target
or editing of an existing target configuration is a relatively simple matter, with the
ACU user interface presenting information in logical order. As a result, the system
essentially allows for direct mode entry with the target configuration being
accomplished in real time. For more information on configuring targets, refer to
Section 5.8.2.6.
2.7 Standby
In Standby mode, the ACU does not command the antenna to move in any axis. The
AZ and EL inverters are powered-up but are not enabled, and brakes are set on
systems equipped with brakes. Real-time status, time, signal level, and position
information is being displayed on the ACU front panel along with any current fault
information. In Standby mode, the ACU is in an active wait state for instructions
from the front panel or computer interface.
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2.8 Manual Control Via Portable Maintenance Control Unit
(PMCU)
Manual control of antenna position is provided from the drive cabinet PMCU or the
ACU user interface. Figure 2-10 shows the PMCU without and with the optional
display.
Figure 2-10 Portable Maintenance Control Units
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2.8.1 Manual Antenna Control from the Drive Cabinet
Manual control of each axis is provided at the drive cabinet using the PMCU,
primarily to facilitate antenna maintenance. Setting the MAINT/REMOTE switch
located on the Relay PCB panel to MAINT mode transfers control of the system to
the PMCU, allowing maintenance to be performed on the system.
Therefore, with this switch in the MAINT position, the ACU cannot assume control.
With the switch in the REMOTE position, the ACU has control of the system and the
PMCU is inoperative.
2.8.2 Manual Antenna Control from the Antenna Control Unit
Real-time manual jog control is provided at the ACU by dedicated keys on the keypad
(one key for each direction of travel), which are activated by selecting Manual antenna control from the ACU Tracking Functions menu (refer to Section 5.8.2.5).
For the AZ and EL axes, pressing the jog keys results in corresponding low-speed
motion of the antenna. Pressing the jog keys while pressing the [SHIFT] key results
in high-speed antenna motion. POL jog control (3-axis systems) is single-speed only.
4TH AXIS jog control (optional 4-axis systems) is also single-speed.
2.9 Immediate Tracking
Immediate tracking is the quickest method to begin tracking. Since it requires very
little configuration, this method of tracking is useful for testing and moving the
antenna to seldom used locations. The 7200 ACU provides immediate tracking
modes as described in the following sections. These tracking modes are accessed
from the Main menu by selecting Tracking functions..., Immediate tracking…. For
more information on these tracking modes, refer to Section 5.8.2.4.
2.9.1 Move to Longitude
This mode is identical to Move to look angles, except that the user enters a longitude
on the geostationary arc instead of AZ and EL coordinates. The ACU computes the
AZ and EL coordinates from the given longitude. (Refer to Section 5.8.2.6.3.4.)
2.9.2 Move to Look Angles
In this mode of operation, the system moves the antenna to a preprogrammed set of
AZ, EL, and POL(s) coordinates (look angles), then actively maintains the antenna at
that position. During the operation, the antenna is moved at slew (fast) speed until
relatively close to the target, and then automatically switches to track (slow) speed
for precise positioning. Positioning is complete when the axis position feedback
reflects antenna positioning to within a user-definable deadband around the target
angles. (Refer to Section 5.8.2.6.3.5.)
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Overview
2.9.3 Steptrack
Steptrack mode provides automatic periodic positioning of the antenna for maximum
receive signal strength as measured at the ACU tracking signal input. The 7200 ACU
utilizes the General Dynamics Adaptive Steptrack (AST) algorithm to perform the
function of conventional steptrack peak signal optimization, eliminating the random
"guessing" errors associated with predetermined fixed scan patterns. AST employs
alternate AZ and EL peaking operations based upon a mathematical relationship
between the changes in receive signal level and angular antenna position. For each
axis, an initial fixed-size step is taken; signal strength levels before and after the step
are used to determine the magnitude and direction of the corrective (peaking) step
required. Once the peak position is determined, flags are set, indicating the direction
of travel of the satellite so that the initial step for the next peaking operation will tend
to move the antenna along the satellite ephemeris. This feature greatly reduces the
errors introduced by the "wrong" guess made during significant portions of the daily
satellite drift by algorithms that consistently make initial steps in a given direction.
Steptrack peaking operations are performed at user-definable time intervals, or when
the receive signal level falls below a user-settable threshold. Steptracking parameters,
including tracking signal frequency, cycle time, track threshold, etc., are established
for each target, allowing maximum versatility for the system. (Refer to Section
5.8.2.4.1)
2.9.4 Star Tracking
Automatic Star tracking is provided as an aid in performing antenna gain calculations
by the radio star method. Such measurements require consistent, accurate
positioning along the path of a star with relatively high velocity. This can be done by
manual positioning, but automatic pointing yields more accurate tests, performed in
less time. Based upon site location coordinates, automatic pointing for stars including
Cassiopeia A, Taurus, and Orion is supported.
2.9.5 Intelsat 11-element Track
In this IESS-412 mode, the antenna is moved according to pointing data generated
using the Intelsat Eleven Parameter Model. The ACU accepts element sets as
distributed by Intelsat, as well as local site data, and calculates the corresponding
predicted AZ and EL positions along the ephemeris. The antenna is then moved to
the predicted positions with sufficient frequency to maintain pointing within a userselectable deadband around the theoretical values. The data for a given target is
maintained in a dedicated database for that target and is continually updated to
provide appropriate positioning anytime the target is accessed (within time of validity
constraints).
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Overview
2.9.6 Orbital Element Track (Optional)
The Orbital Element Tracking (OET) mode allows the user to input a Cartesian orbital
element set to be used in an open loop pointing of the antenna over time. This
tracking mode is available as a target and can be set up from the front panel or the
M&C interface. To use the OET mode the operator first creates an OET target by
inputting Cartesian orbital elements at a specific epoch in the True Earth Mean
Equinox (TEME) reference system. This element set has the general format of
Date/Time, X position, Y position, and Z position, X velocity, Y velocity and Z
velocity.
Built in sanity checking is available in the form of expected means with acceptable
tolerances. The user can enable or disable individually checks on the following
characteristics: Semi-major axis, Eccentricity, Inclination, Right Ascension of the
ascending node, and Argument of Perigee. If the input orbital elements differ from
the enabled check by more than a preset tolerance, an error is issued and the orbital
element set is not used.
When the tracking mode is executed the ACU uses built in propagators and the real
time clock to calculate look angles for antenna pointing in real time. Two built in
propagators are available in the 7200 series controllers. The first is a two-body
propagator based on Keplarian motion. The second is a multi-body propagator that
includes the effects of Moon and Sun gravitational forces and a 4x4 Geopotential
model. The system uses the Two-Body for all start up look angle calculations and
switches to the Multi-Body when the element set has been brought up to real time.
New look angles can be calculated as frequently as every ½ second out to every 120
seconds.
For proper operation of the OET mode it is important that the site information stored
in the ACU be as accurate as possible. This means it should be acquired from site
survey information or averaged from a GPS receiver. The built in clock must be set to
UTC time and updated once each day. Note: The internal real time clock can only be
set to the second and at worst case could drift 1 second per day. The ACU read outs
should be carefully calibrated to the local azimuth/elevation reference system. The
frequency at which new element sets should be input to the ACU will depend greatly
on the type of orbit represented. At minimum new elements must be provided each
time a satellite maneuver takes place. The propagators will also deviate from real life
over a period of time. This could be days, weeks or months depending on the orbit in
question.
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Overview
2.10 Tracking Functions
The 7200 ACU allows a user to configure up to 50 targets for establishment of
target-specific databases (refer to Section 5.8.2.6). The following tracking modes
are available:
• Move to longitude (refer to Section 2.9.1)
• Move to look angles (refer to Section 2.9.2)
• Orbit Prediction Tracking (OPT)
• Star tracking (refer to Section 2.9.4)
• Intelsat 11-element (IESS-412) (refer to Section 2.9.5)
• Orbital Element Track (Optional) (refer to Section 2.9.6)
2.10.1 Orbit Prediction Tracking
The OPT system provides exceptional short-term and long-term pointing capabilities
by combining orbital mechanics with modern modeling and error analysis techniques.
Orbital mechanics are used to provide a model of the satellite and earth's surface
motion. The modeling and error analysis takes pointing data collected in Steptrack
operations and finds the satellite orbital parameters and systematic errors caused by
the mechanical structure which provide the best least squares solution. The orbital
parameters and systematic errors are then fed back through the orbital mechanics
models to determine antenna look angles at any future point in time. The models
accurately match the "real world" and provide excellent real world results. (Refer to
Section
3.1).
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Theory
3.0 THEORY
This section provides in-depth information on OPT and Orbit scan, two of the more
advanced features of the 7200 ACS.
3.1 OPT
3.1.1 Orbit Prediction
OPT is the algorithm used by the 7200 ACS to predict the position of a spacecraft
based upon its previous motion. The basic principle proposes that if the
spacecraft's position, velocity, and the forces acting upon it are known, its
position can be predicted at any time in the future.
An "OPT model" is what is referred to in orbital mechanics as an orbital element
set. An orbital element set describes the position and velocity of an orbiting body
at some particular time (the epoch time, or simply, the epoch). OPT's position
predictions are made by taking the orbital element set and using the data it
provides, along with the computed forces acting on the spacecraft, to predict the
position of the spacecraft at the desired time.
The prediction is performed using an algorithm called a propagator. A propagator
takes an orbital element set at some epoch and produces an orbital element set at
a later epoch. OPT uses two different propagators in its operations:
•Two-body propagator: where only the earth's force on the spacecraft is
considered and earth is modeled as a sphere with uniform mass.
•Multibody propagator: where the following effects on the spacecraft are
considered:
- Earth's gravity, including a geopotential model (accounting for the
nonuniformity of the earth's gravitational field).
- Sun's gravity.
- Moon's gravity.
- Solar radiation pressure on the spacecraft.
The two-body propagator is the simplest and fastest, and provides quick solutions
while accounting for the most significant factor affecting the spacecraft's motion.
The more complex multibody propagator provides a more accurate model of the
spacecraft's actual motion.
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Theory
3.1.2 Orbit Determination
An orbital element set is composed by making an initial guess of the orbit and then
generating positions from this guess using the propagators described previously.
These positions are compared with the positions gathered by AST. The differences
between AST data and propagator-generated data are used to determine a
correction to the orbit. The process is repeated until the RMS error between the
AST data and the propagator-generated data is minimized. The algorithm used to
perform this is referred to as the solver.
The orbit must be periodically re-solved in order to remain accurate. Theoretically,
if all of the forces acting upon the spacecraft are known at any time, the orbital
element set can be predicted forward to any desired time. However, all of the
forces are not known at all times. The largest unknown force comes from the
station-keeping maneuvers performed in order to keep the spacecraft in the desired
orbit. Station-keeping is only performed periodically (typically once every few
days). The validity of an orbit solution determined from data after a maneuver has
taken place is not adversely affected by station-keeping until a new station-keeping
maneuver is performed.
The two-body propagator does not take into account any forces except those
generated by the Earth's gravity, and even then, a simplified model is used. A
position prediction from a two-body propagator has an error that grows with time
due to the omission of these forces in the orbit determination.
Neither propagator can account for varying effects on the ground. The primary
ground errors affecting the system are:
• Wind loading of the antenna.
• Thermal distortion of the antenna, caused by non-uniform solar heating.
Both of these factors affect the data collected by AST. However, OPT is able to
separate ground errors from the orbital solution because the spacecraft's motion
must follow Newton's laws. This information is retained as two error terms, one
per axis. These error terms are used to correct future position predictions.
3.1.2.1 Short-term and Long-term OPT Solutions
OPT generates three distinct types of orbital solutions:
• Short-term solution using two-body propagator (ST)
• Long-term solution using two-body propagator (LT2b)
• Long-term solution using multibody propagator (LTmb)
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Theory
All of these solutions are generated using the method described previously. The
differences in the solutions are due to the time span of AST data used, and the
propagator used. The ST will use up to the last 10 hours of data available, while
the LT (2b and mb) will use up to the last 73 hours of data available.
Assuming that tracking is started on a target with no stored AST data, the first ST
solution will be available for use approximately 90 minutes after tracking begins.
The first LT2b solution will be available 18 hours after tracking begins. The first
LTmb solution will be available 35 hours after tracking begins.
The choice of which solution to use for tracking is made after each steptrack cycle
by comparing the peak position with the predicted positions from all available
models. The solution that produces a position closest to the steptrack peak is
used.
3.2 Orbit Scan
The 7200 ACU has a satellite-locating algorithm referred to as Orbit scan. The
purpose of Orbit scan is to locate satellites in inclined operation. This method is
superior to other scanning methods such as Box Scan, Spiral Scan, or Raster Scan.
Orbit scan will only search the most probable path of the satellite and not waste
time in empty sky.
The Orbit scan mode is a user-selectable option on the OPT tracking. If enabled,
Orbit scan will be used when no OPT solutions exist, and no signal is available at
current pointing or at box center for the designated target.
3.2.1 Orbit Scan Theory
This scan method will only be effective for geosynchronous satellites in inclined
operation. It is assumed that the satellite owners are attempting to hold nominal
longitude and a near circular orbit.
The 7200 ACS creates a set of orbital parameters that place the ascending node at
nominal longitude and provide the estimated inclination. The resulting trajectory
will follow the most likely path for a satellite in this type of operation. From the
site point of view, this produces a figure 8 (approximately) which is followed from
box center. The system always starts by traveling north from box center, all the
way around the figure 8 and back to box center (refer to Figure 3-1). This will
work correctly regardless of site to satellite orientation. (Note: Figure 3-1 shows
the scan in terms of latitude/longitude. The trajectory will look different in terms of
AZ/EL based on site position and satellite position.)
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NOMINAL LONGITUDE
SOUTH LATITU
NORTH LATITU
SEARCH
DIRECTION
0
INCLINATION
Theory
Figure 3-1 Orbit Scan Theory
3.2.2 Orbit Scan Operation
To use Orbit scan it is necessary to have correct site information loaded in the site
parameters. When an OPT target is built, the user must provide the nominal
longitude (degrees east) and an estimated inclination. Then the Orbit scan
parameter must be enabled. (Note: The longitude range is NOT used by Orbit scan
but is used to set up Box limits for the target's operation.)
If no solutions are available when the target is selected for tracking the system will
follow this sequence. If Box limits are enabled, then OPT will check to see if the
system is currently inside the box. If not, the system will go to box center. Then it
will check for a signal. If no signal is received, and Orbit scan is enabled, OPT will
calculate a satellite trajectory which places the ascending node at the nominal
longitude and provides an inclination equal to the estimated inclination provided.
The trajectory is assumed to be a circular orbit with a sidereal period. This
trajectory is then followed in steps equal to a 5 dB signal change based on the 3
dB beamwidth of the antenna. The signal level is monitored throughout the
operation. The satellite is assumed to be acquired if the level rises 0.5 dB above
the Low signal level set for the target. If no satellite acquisition occurs after one
pass, the system will stop at box center and issue an OPTcannot track alarm.
It should be noted that the Orbit scan is only used when no OPT solutions exist for
a given target. Once a solution exists, no matter how old it may be, the scan will
NOT be used, even if there is no signal at the solution's position.
At acquisition, the system enters steptrack to peak the antenna and then begins
standard OPT operation.
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Installation
panels, or shields. Never make internal adjustments or perform maintenance
with the equipment and don't take chances. In case of emergency, be sure
the equipment.
4.0 INSTALLATION AND INITIAL SETUP OF SYSTEM
WARNING
Always disconnect power before opening covers, doors, enclosures, gates,
or service when alone or fatigued. Qualified personnel should perform main
power connections and grounding. Keep away from live circuits; be familiar
to disconnect power before touching equipment or personnel in contact with
4.1 Overview
This section of the manual provides the information necessary for the installation
and initial setup of the 7200/7150 ACS for all modes of operation, including
connection details for the remote serial interface.
The system installation and setup instructions are presented in the following
general order.
• Mechanical Installation
• System Cabling
• Power-Up and Setup
4.2 Mechanical Installation
4.2.1 Antenna-Mounted Components
Mechanical interfaces for the antenna and motors vary with the specific equipment
provided and are detailed in the drawing package supplied with each antenna.
Proper and complete installation of the motors, resolvers, and limit switches is
imperative for safe and accurate system operation. Refer to the mechanical
drawings supplied in the appropriate drawing package separate from this manual
for mechanical interface details and complete this phase of installation first.
4.2.2 Installing the Drive Cabinet
Refer to General Dynamics foundation and conduit layout drawings for
recommended locations of the drive cabinet. Use the following procedures to install
the drive cabinet. Due to the weight of the cabinet, more than one person is
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Installation
required to lift or move the equipment. The cabinet should be lifted using the
underside of the main enclosure as the lift points.
1. Locate the drive cabinet as close as possible to the antenna without obstructing the full
range of antenna movements. The pad that the cabinet will be installed on should
have an 8 ft. grounding rod installed down into the concrete pad to provide protective
earthing. A grounding wire should be clamped to this rod, then fed up into the cabinet
and securely attached to the cabinet ground stud using the hex nuts with starwashers
provided with the cabinet.
2. Center the drive cabinet over any conduit stub-ups to facilitate conduit termination and
wire pulling.
3. Attach the drive cabinet to the foundation using at least two 1/2-inch concrete anchors
on each leg.
4. Using a set of knockout punches, punch conduit holes in the bottom of the drive
cabinet to facilitate conduit entry. Install conduits.
4.2.3 Installing the 7200 ACU
Determine the location of the 7200 ACU in the rack. Refer to Figure 4-1 for details
of rack mounting.
Figure 4-1 Mounting the 7200 ACU
1. Separate individual slides into two pieces by removing the outer portion. Note: Part of
the slide should be left bolted to the ACU.
2. Mount the small angle brackets to the portions of slides removed in step 1 as shown.
3. Mount the slide assembly from step 2 into the rack. Note: Be sure to use the provided
flathead screws for the front slide mount. Do not fully tighten any bolts yet.
4. Be sure both slides are mounted at the same height and are level.
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Installation
5. Slide the 7200 ACU into the rack-mounted slides.
6. Adjust the rack-mounted slides as necessary until the ACU slides smoothly in and out
of the rack.
7. Fully tighten all hardware.
8. There is a stud on the rear panel of the 7200 ACU that is marked with the protective
earth (ground) symbol. A proper grounding wire from the rack that this piece of
equipment is installed into should be attached to this stud, making sure that the end of
the grounding wire has good metal-to-metal contact with the rear panel of the ACU.
Use the hex nut provided with the ACU (or similar nut) to secure this grounding wire to
the rear panel stud.
9. Make sure the area directly behind the fan on the rear panel of the 7200 ACU is kept
clear once the equipment is installed in the rack to allow for proper ventilation of the
unit.
10. The 7200 ACU should be connected to a grounded AC power outlet using a detachable
power cord.
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Installation
4.3 System Cabling
The following sections describe the cabling and list the connections for the 7200
ACS. Cables must be connected from the antenna to the drive cabinet, from the
drive cabinet to the 7200 ACU, and from the antenna directly to the 7200 ACU.
Power must also be provided from CFE power distribution points to the drive
cabinet and ACU. Be sure the cables are connected correctly and securely
because proper functioning of the system during power-up is important for the
protection of the equipment and for timely completion of the installation. Refer to
Figure 4-2.
Figure 4-2 7200 Antenna Control System Cabling Diagram
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Installation
NOTE:
wire with ground. Other prime power
configurations are available by special order. The neutral wire of
the power system must be installed for proper operation.
4.3.1 Drive Cabinet Main Power Connection
Always follow applicable local electrical safety codes when installing wire
and cables.
1. If conduit is not installed, use chase nipples with bushings or other suitable
means to protect the wire and cables.
2. Check the main breaker size in the drive cabinet to determine required power
conductor size for this installation.
3. If the wire from the distribution panel to the drive cabinet is long, increase wire
size to keep the voltage drop to less than 5 percent of nominal.
The prime power required for the standard drive system
is 3 phase WYE, 5-
4. Connect the three-phase line leads to the line side (top) of the main circuit
breaker in the upper right corner of the drive cabinet. Refer to Figure 4-3 for a
drawing of the drive cabinet.
Figure 4-3 Drive Cabinet Assembly
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Installation
DRIVE CABINET
TB1
5. Tag the neutral wire with white electrical tape and connect the wire to one of
the large terminals marked N on TB1 in the lower right corner of the drive
cabinet.
6. Tag the ground wire with green and yellow electrical tape and connect
the wire to one of the large green terminal blocks labeled with a G or a
ground symbol on TB1.
4.3.2 Connecting the Drive Motors to the Drive Cabinet
To connect the drive motors to the drive cabinet, refer to Table 4-1 and use the
following procedures.
NOTE: The AZ and EL motors require 3-phase conductors and
a ground conductor.
TABLE 4-1 MOTOR CONNECTIONS TO THE DRIVE
CABINET
DEVICE FUNCTION
Az-U Az Motor Phase 1
Az-V Az Motor Phase 2
Az-W Az Motor Phase 3
EL-U EL Motor Phase 1
EL-V EL Motor Phase 2
EL-W EL Motor Phase 3
POL CW POL Motor POL Motor CW
POL CCW POL Motor POL Motor CCW
N POL Motor POL Motor Common
4TH AXIS CW POL Motor 4TH AXIS Motor CW
4TH AXIS CCW POL Motor 4TH AXIS Motor CCW
N POL Motor 4TH AXIS Motor Common
1. Wire the AZ and EL motors for the appropriate system voltage by following the
motor wiring diagrams inside the motor terminal box or on the motor
nameplate.
2. Connect the AZ motor leads to TB1 terminals labeled Az-U, Az-V, and Az-W.
3. Connect the motor ground wire to the ground terminal.
4. Connect the EL motor leads to TB1 terminals labeled EL-U, EL-V, and EL-W.
5. Connect the motor ground wire to the ground terminal.
If 2-axis system, perform steps 1-5.
If 3-axis system, perform steps 1-9.
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Installation
If 4-axis system, perform steps 1-13.
6. Connect the wire from terminal 1 of the POL motor to the TB1 terminal labeled
POL CW in the drive cabinet.
7. Connect the wire from terminal 3 of the POL motor to the TB1 terminal labeled
POL CCW in the drive cabinet.
8. Connect the wire from terminal 2 of POL motor to TB1 terminal labeled N.
9. Connect the POL AXIS motor case ground to the ground terminal on TB1 in the
drive cabinet.
10. Connect the wire from terminal 1 of the 4TH AXIS motor to the TB1 terminal
labeled POL CW in the drive cabinet.
11. Connect the wire from terminal 3 of the 4TH AXIS motor to the TB1 terminal
labeled POL CCW in the drive cabinet.
12. Connect the wire from terminal 2 of 4TH AXIS motor to TB1 terminal labeled
N.
13. Connect the 4TH AXIS motor case ground to the ground terminal on TB1 in
the drive cabinet.
4.3.3 Limit Switch Connections
Connect the limit switches to TB1-1 through TB1-9 on the drive cabinet as shown
in Table 4-2. Note that normally closed (open upon limit) contacts are required.
TABLE 4-2 LIMIT SWITCH CONNECTIONS TO THE DRIVE CABINET
DRIVE CABINET TB1 DEVICE FUNCTION
1 Az Limit Switch Az CW Limit
2 Az Limit Switch Az Limit Common
3 Az Limit Switch Az CCW Limit
4 EL Limit Switch EL Up Limit
5 EL Limit Switch EL Limit Common
6 EL Limit Switch EL Down Limit
7 POL Limit Switch POL CW Limit
8 POL Limit Switch POL Limit Common
9 POL Limit Switch POL CCW Limit
10 4TH AXIS Limit Switch 4TH AXIS CW Limit
11 4TH AXIS Limit Switch 4TH AXIS Limit Common
12 4TH AXIS Limit Switch 4TH AXIS CCW Limit
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Installation
4.3.4 Installing the 7200 ACU Control Cable
The procedures for installing the 7200 ACU control cable are different for the
standard product and a system with the optional low-temperature package. For
standard system installation, refer to Section 4.3.4.1; for systems with EIA/TIA422B cable installation refer to Section 4.3.4.2.
4.3.4.1 Standard System 7200 ACU Control Cable Installation
1. Connect one end of the 25-conductor control cable (Belden 8459 or equivalent)
to the 25-pin connector labeled DRIVE INTERFACE (J10) on the back of the
7200 ACU (refer to Figure 4-4). Refer to Table 4-4A for a pin-out and the
function of each conductor.
2. Connect the other end of the 25-conductor cable to J1 on the relay board inside
the drive cabinet (refer to Table 4-4A).
TABLE 4-3 REAR PANEL CONNECTORS
REF DESIG TYPE GENDER
J2 (Optional) 24-pin IEEE-488 SOCKET (female)
J3 (Optional) BNC SOCKET
J5, J6 DB-9 SOCKET
J7, J8 DB-25 SOCKET
J9 RJ-45 SOCKET
J10 DB-25 PLUG
J11 DB-37 SOCKET
J14, J15 DB-25 SOCKET
J16, J17 DB-25 PLUG
J18, J19, J20 DB-9 PLUG
J21 DB-9 PLUG
TB1 20 PIN PLUGGABLE TERMINAL STRIP
Figure 4-4 7200 Antenna Control Unit Rear Panel
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Installation
TABLE 4-4A CONTROL CABLE CONNECTIONS
DRIVE CABINET J1 7200 ACU J10 FUNCTION
1 1 AZ CW Command
2 2 AZ Common
3 3 AZ CCW Command
4 4 EL Up Command
5 5 EL Common
6 6 EL Down Command
7 7 POL CW Command
8 8 POL Drives Enable Command
9 9 POL CCW Command
10 10 Summary Limit
11 11 4TH AXIS CW Command
12 12 4TH AXIS Drives Enable Command
13 13 4TH AXIS CCW Command
14 14 AZ Fault
15 15 EL Fault
16 16 E Stop Return
17 17 Sum Limit, Az Fault, EL Fault Common
18 18 Sum Limit, Az Fault, EL Fault Common
19 19 E Stop Command
20 20 No Connection
21 21 AZ High Speed Command
22 22 EL High Speed Command
23 23 Drives Enable
24 24 Local Maint Status
25 25 Local Maint Status Return
TABLE 4-4B CONTROL CABLE CONNECTIONS
DRV CAB TB1 7200 ACU J16 FUNCTION
Rx(+) 19 EIA/TIA-422B Receive
Rx(-) 6 EIA/TIA-422B Receive Not
SHLD 20 Shield
4.3.4.2 Standard System 7200 ACU EIA/TIA-422B Cable
Installation
1. Connect one pair of the two twisted pair control cable (Belden 8162 or
equivalent) to the 25-Pin connector labeled (J16) EIA/TIA422 on the back of
the 7200 ACU (refer to Figure 4-4). Refer to Table 4-4B for a pin-out and
function of each conductor.
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Installation
__
2. Connect the other end of the same pair of the two-twisted pair cable to
terminal strip TB1 inside the drive cabinet (Refer to Table 4-4B).
4.3.4.3 Portable Maintenance Control Unit (PMCU) With Position
Display Option Installation
The PMCU with Optional Position Display is provided for local control at the antenna.
It is located inside the 7150 drive cabinet.
4.3.4.3.1 PMCU Connections
The following table gives the terminal numbers and a description of the terminals of
the PMCU terminal strip (J5) on the relay Printed Circuit Board (PCB) and the MS
connector located on the back plate of the 7150 drive cabinet. The connections on
TB1 are for the EIA/TIA-422B that is used on the optional PMCU display. This
information is for reference only.
TABLE 4-5 PMCU CONNECTIONS
RELAY PCB "J" CONNECTORS DESCRIPTION MS CONNECTOR PIN OUT
J5-1 INTERRUPT RTN B
J5-2 MAINT. INTERRUPT A
J5-3 AZ CW N
J5-4 AZ/EL COMMON E
J5-5 AZ CCW P
J5-6 AZ SLEW J
J5-7 EL UP L
J5-8 EL DN M
J5-9 EL SLEW K
J5-10 POL CW G
J5-11 POL COMMON F
J5-12 POL CCW H
J5-13 4TH AXIS CW C
J5-14 4TH AXIS CCW D
J5-15 NC
J5-16 NC
J4-13 +24 VDC W
J4-11 VDC COMMON X
TB1 TERMINAL STRIP
EIA/TIA-422B Rx EIA/TIA-422B RECEIVE R
EIA/TIA-422B Rx
SHLD SHLD T
NC U
NC V
NC Y
NC Z
EIA/TIA-422B RECEIVE NOT
S
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Installation
• Port = 3
• Stop bits = 1
• Baud (bps) = 9600
• Shell = PMCU
• Parity = None
• Handshake = None
• Data bits = 8
4.3.4.3.2 PMCU Display Setup
In order for the PMCU display to operate, the serial link connections must be in place
between the ACU and drive cabinet, and the EIA/TIA422 (J16 or Port 3) serial port
must be setup properly in the ACU. Failure to perform the following steps will result
in a LINK LOSS fault on the PMCU display. The PMCU will still be able to control the
antenna locally.
1. Complete the serial link connections between J16 (EIA/TIA422) on the ACU and
TB1 in the drive cabinet. Refer to Table 4-4B for connection description. Refer to
Table 4-12 for a complete EIA/TIA422 pin-out of port J16.
2. From the 7200 ACU Main Menu, select Edit System Configuration…, Remote Port
Configuration. Setup the following parameters. Please be aware that these port
configuration changes must be saved before the new settings become valid.
4.3.5 Resolver and Encoder Connections
Single-speed, size-11 resolvers are standard for azimuth, elevation, polarization,
and 4th axis (optional). Two-speed (size-20 resolvers) and optical encoders are
options available for azimuth and elevation.
4.3.5.1 Resolver Connections
The connections for size-11 resolvers are provided in Table 4-6A. Connect each
connector to the appropriate connector on the rear of the ACU. J6 & J5 are 9-pin
D connectors, and J7 and J8 are 25-pin D connectors. Refer to Figure 4-4 for
location of the connectors on the ACU. See Appendix H for using CTB055 to
attach the resolver wires to the resolver control cable.
NOTE: Connect shield leads at the ACU connector end only. Do not allow the shield
leads to come into contact with one another or with the resolver case. At the antenna
end, tape each lead separately. Connecting shields at both ends creates a current path
(ground loop) which may cause erratic position readings.
7200 – J6, J7, J8, J5 FUNCTION* RESOLVER LEAD COLOR
2 R1 Red/White
8 R2 Yellow/White
9 S1 Red
5 S2 Yellow
4 S3 Black
3 S4 Blue
1,6,7 Shield Not Connected at Resolver
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Installation
* Shielding pairs: R1-R2, S1-S3, S2-S4.
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Installation
RESOLVER PIGTAIL LEAD COLOR AND
CIRCULAR CONNECTOR PIN NUMBER
The connections for two-speed, size-20 resolvers are provided in Table 4-6B.
Connect each connector to the appropriate connector on the rear of the ACU. J7
and J8 are 25-pin D connectors. Refer to Figure 4-4 for location of the connectors
on the ACU.
If position readouts bobble or do not track to antenna motion, refer to Section 5.0
in Appendix E, Troubleshooting Guide, of this manual.
4.3.5.2 Optical Encoder Connections
This section applies only if optical encoders are used for the azimuth and elevation
transducers. Model 800499-01 is the optical encoder J-box assembly. Model
800499-02 is the assembly with optional Position Display Unit (PDU), which
shows position feedback even without an ACU. 18-bit encoders connect directly
to the ACU and do not use a J-box. See Table 4-8C.
Note: Shield must be terminated on pins 17 & 23 for CLK and DATA respectively
on the 7200 side for noise reduction purposes.
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Installation
AZIMUTH & ELEVATION OPTICAL ENCODER
J-BOXES J3
NOTE: The table below only applies to 800499-02.
TABLE 4-9 POSITION DISPLAY UNIT TABLE
PDU – J1, J2 FUNCTION
15 CLK 1
16 CLKN 2
17 SHLD (CLK) NC
18 CLK2 7
19 CLK2N 8
20 SHLD (CLK2) 10
21 DAT 3
22 DATN 4
23 SHLD (DAT) 9
24 +24V 5
25 24V RTN 6
4.3.6 Analog Input Connections
One analog input port is provided on the 7200 ACU via J21 on the rear panel (refer
to Figure 4-4). Internally, the analog input connects to an A/D converter circuit that
provides tracking signal inputs to the main processor.
The analog input has (+), (-), and GND terminals to facilitate devices with isolated
or differential outputs. In most cases, the (+) output of the tracking receiver
connects to the (+) analog input, and the common or (-) output of the tracking
receiver connects to the (-) analog input with no further connections required. The
analog input voltage range is 0 to 10 VDC. The voltage per dB slope range is 0.1
to 1.0 V/dB.
NOTE: When connecting a General Dynamics TRL or DTR Tracking
Receiver via serial link, the analog input is not used. However, when
connecting a Model 253 Tracking Receiver via serial link, the analog input is
required to return the signal level back to the 7200.
Refer to Table 4-10 and connect the analog input to J21 (9-pin D-connector) on
the rear panel of the 7200 ACU.
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Installation
TABLE 4-10 ANALOG INPUT CONNECTIONS
J21 DESIGNATION FUNCTION
1 GND Chassis Ground
2 AD1+ Channel 1(+) *
3 AD1 GND Chassis Ground
4 NOT USED No Connection
5 NOT USED No Connection
6 GND Chassis Ground
7 AD1- Channel 1(-) *
8 NOT USED No Connection
9 NOT USED No Connection
* Standard connection scheme.
4.3.6.1 A/D Circuit Calibration
A calibration procedure is performed at the factory as part of the normal product
configuration, therefore a field calibration is only performed if operational problems
due to drift are encountered at a later date or if different video receivers are used
in the AGC mode. Should field calibration be necessary, refer to General Dynamics
Document #CG-0283
4.3.7 Digital Inputs
The input pairs for the Digital Input, J11, are shown in Table 4-11.
TABLE 4-11 DIGITAL INPUTS – J11
7200 ACU – J11 INPUTS
1 24 -
2
3
4 23 +
5
6 22 +
7 21 -
8 21 +
9 20 -
10 20 +
11 19 -
12 19 +
13 18 -
14 18 +
15 17 -
16 17 +
24+
23 -
22 –
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Installation
17 15 -
18 15 +
19 NC
20 14 -
21
22 11 -
23 11 +
24 10 -
25 10 +
26 9 -
27 9 +
28 8 -
29 8 +
30 7 -
31 7 +
32 6 -
33 6 +
34 NC
35 NC
36 NC
37 NC
14 +
4.3.8 Remote Communications Connections
Tables 4-12 and 4-13 provide the connections for the remote communication ports
to the 7200 ACU. Two independent Monitor and Control (M&C) protocols are
provided with the 7200 ACU:
1) Request/Command (RC) M&C Protocol – This protocol format is ASCII based;
the protocol is concise, yet includes all the commonly used commands for
operation. See General Dynamics Document # CG-6042.
2) Menu Tree M&C protocol – This protocol format is also ASCII based but is more
comprehensive. It includes all setup and operational commands as well as
some diagnostics. See General Dynamics Document # CG-6045.
Refer to Section 5.8.6.12, Remote Port Configuration, for additional interfaces.
The standard 7200 ACU is capable of EIA/TIA-232E, EIA/TIA-422B, and Ethernet
communications.
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Installation
TABLE 4-12 STANDARD COMMUNICATION PORT
CONNECTIONS (EIA/TIA-232E)
J14, J15 DESIGNATION FUNCTION
1 PROT GND Protective Gnd
2 EIA/TIA-232 XDATA Transmit
3 EIA/TIA-232 RDATA Receive
7 SIG GND Signal Gnd
9 * (see below) +12V (off by default)
Fiber Optic Modem Power
(Enabled by SW1 on rear panel)
A RS-232 cable run longer than approximately 50 feet requires fiber optic cables
with a fiber optic modem at each end. The modem can be powered by +12V
supplied by pin 9 of each RS-232 port (J14 and J15). Each connector is
individually switched by a DIP switch, SW1 Modem Power, located on the rear
panel (see Figure 4-4). The top switch controls J14, and the bottom switch
controls J15. Both switches are in the left position (off) by default.
General Dynamics offers the following fiber optic modems (optional):
BFM001 - 25 pin D (powered by pin 9)
BFM002 - 25 pin D (externally powered)
BFM020 - External Power source for BFM002
TABLE 4-13 COMMUNICATION PORT CONNECTIONS (EIA/TIA-
422B)
J16, J17 DESIGNATION FUNCTION
1 GND Ground
2
6 XDATA- Transmit (-) *
9 RDATA- Receive (-) *
15
16
19 XDATA+ Transmit (+) *
20 XDATA SHLD Transmit Shield *
22 RDATA+ Receive (+) *
23 RDATA SHLD Receive Shield *
* Standard connection scheme for EIA/TIA-422B port.
NOTE: If a PMCU with Position Display is connected as specified in
Section 4.3.4.3.2, J16 is not available for use with an M&C system.
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Installation
PIN
LABEL
PIN ORIENTATION
TABLE 4-14 COMMUNICATION PORT CONNECTIONS (EIA/TIA-
422B)
J18, J19, J20 DESIG FUNCTION
1 XDATA+ Transmit (+) *
2,3 NC No Connect
4 RDATA+ Receive (+) *
5 GND Shield (Chassis Gnd)
6 XDATA- Transmit (-) *
7,8 NC No Connect
9 RDATA- Receive (-) *
* Standard connection scheme for EIA/TIA-422B port.
The Ethernet port, J9, is available for use with an M&C system. The pin
connections are detailed in Table 4-15.
4.3.9 Remote Beacon Select and Summary Fault Connections
TB1 on the 7200 ACU rear panel provides a summary fault output (normally closed
dry contacts) and four contact closures for remote beacon selection. The fault
contacts have continuity between them under normal conditions but provide an
open circuit under fault conditions. The terminals for remote beacon select are
open circuits for the respective beacon 1 through 4 unless that beacon is selected
through the 7200 ACU front panel. Thus, the customer interface beacon contacts
for any selected beacon provide a closed circuit, allowing the flexibility of
switching beacon channels and/or sources on compatible equipment. The
remaining IN and OUT terminals are reserved for future use.
Refer to Table 4-16 and make the appropriate connections to TB1 on the 7200
ACU rear panel.
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Installation
TABLE 4-16 REMOTE BEACON SELECT AND SUMMARY FAULT
TERMINAL STRIP
TERMINAL (TB1) FUNCTION INPUT/OUTPUT
1 Summary Alarm Out OUTPUTS
2 Summary Alarm Return
3 Beacon 1 Out
4 Beacon 1 Common
5 Beacon 2 Out
6 Beacon 2 Common
7 Beacon 3 Out
8 Beacon 3 Common
9 Beacon 4 Out
10 Beacon 4 Common
11 Output 22 +
12 Output 22 Common
13 * CP Command Common (+)
14 * CP Command +
15 * LP Command Common (+)
16 * LP Command +
17 * CP Position Common (+) INPUTS
18 * CP Position Ind (Return)
19 * LP Position Common (+)
20 * LP Position Ind (Return)
* Optional CP/LP switching firmware must be installed in the 7200 ACU for TB1 pins 13 to
20 to have these assigned functions.
Pins 4, 6, 8, and 10 are tied together and connect to the COM terminal on the
General Dynamics tracking receivers. Pins 3, 5, 7, and 9 connect to the
appropriate Bn terminal on the tracking receiver. Pin 1 is on the left end of TB1
with the user facing the rear of the 7200 ACU. The summary alarm output (TB1
pins 1 and 2) is provided for customers who wish to receive an indication anytime
a fault occurs on the 7200 ACU. This is typically connected to an indicator light
or buzzer in the main control room of an earth station, or may be tied as an input
to a monitor and control computer system. The electrical specifications for this
output are provided in Table 2-7 (Section 2.4.1.3).
4.4 Initial Power-Up and System Setup
Before proceeding with system power-up, check all system cabling and termination
for correctness and integrity. Then proceed with the following items in the order
presented. Because the antenna may be moved from the control panel of the drive
cabinet, independent of the ACU, system start-up will be initiated at the drive
cabinet before the ACU.
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Installation
4.4.1 Drive Cabinet Power-Up and Initialization
The inverters have no internal adjustments; therefore, before power-up the covers
of the inverters should be in place.
4.4.1.1 Initial Power-Up
1. Verify that the following conditions exist at the respective drive cabinet
controls:
a. CONTROL switch set to the MAINT position
b. CONTROL POWER switch set to ON
c. EMERGENCY STOP button pulled out
2. Apply power to the drive cabinet by setting the MAIN CIRCUIT BREAKER to
ON. Turn on all other breakers. The green indicator LED in the center of the
CONTROL POWER circuit breaker should illuminate at this time. Also, the
displays on the inverters should become active.
4.4.1.2 Inverter Drive Setup (AZ/EL Drv Modules)
The intelligent, variable speed motor control modules incorporated in the drive
cabinet for AZ and EL require correct setting for a number of operational
parameters. All parameters should be set correctly from the factory, but the
procedures in Section 4.4.1.2.1 should be followed to ensure that the correct
settings have been retained. Additionally, some codes may have to be altered
during system installation to fine-tune system performance.
4.4.1.2.1 Inverter Drive Operation
All functions of the inverter drives are accessed using the Digital Operator. In
addition to controlling the motor operation, the operator can enter information into
the inverter’s memory to configure its operation. See the Vendor Manual on the
product CD for more detailed information.
GPD315 INVERTER DRIVE OPERATION
The following figures and tables summarize the operation of the GPD315 Inverter
Drive. For more information, refer to the drive’s manuals.
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Installation
MINMA
X
STO
P
RESET
DATAENTER
FREFFOUTIOUTMNT
R
F/R
LO/REPRGM
DIGITAL
OPERATO
R
JVOP-14
0
Figure 4-5 GPD315 Digital Operator Indicator and Key Description
4-23
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Installation
FR
E
FF
O
UT
IOUT
Press
DSPL
Press
DSPL
MN
T
R
Press
D
SP
L
Pr
es
s
DSPL
F/R
L
O/RE
P
R
GM
Press
D
S
PL
Press
D
S
PL
Pr
es
s
DS
PL
FRE
F
FOUT
IOUT
MNTR
F/R
LO/RE
PRGM
By pressing the DSPL key on the Digital Operator, the operator can step to each of
the seven Function LEDS and its associated display/setting function:
Figure 4-6 Digital Operator Indicator and Key Description
TABLE 4-17 DIGITAL OPERATOR LED FUNCTION DESCRIPTIONS
Key Description
Frequency Reference Setting
Sets/Displays the GPD 315 operation speed (Hz).
Output Frequency Monitor
Displays the output frequency (Hz) at which the GPD 315 is currently operating.
This is a monitor only function; the operator cannot change the displayed value by
use of the keypad.
Output Current Monitor
Displays the level of the output current (Amps) that the GPD 315 is currently
producing. This is a monitor only function; the operator cannot change the displayed
value by use of the keypad.
Monitor Selection
Pressing ENTER allows access to the various Monitor parameters, U-01 through U-
10. These are monitor only functions; the operator cannot change the displayed
value. Accessible during run command. See vendor literature for complete listing of
all monitor parameters.
FWD/REV Run Selection
Sets the rotation direction of the motor when a Run command is given by the Digital
Operator keypad. Display of For=forward run, rEu=reverse run.
Local/Remote Selection
This toggles between the Local (Digital Operator) and Remote (set by parameters
n003 & n004) modes of operation. This affects both the start/stop functions, as
well as the frequency reference. Local/Remote status cannot be changed using this
LED when a multi-function input terminal is set for Local/Remote (n050 through
n056 set for “17”).
Parameter Programming
Selects or reads data using parameter number (nXXX). Data is displayed by pressing
4-24
the ENTER key, and can be changed by pressing the “up arrow” or “down arrow”
keys. Any changes can be saved by again pressing the ENTER key. Pressing the
DSPL key exits the Programming mode.
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Installation
V1000 INVERTER DRIVE OPE RATION
Figure 4-7 V1000 Keys, Displays, and LEDs
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Installation
Menu Structure for Digital LED Operator
Figure 4-8 V1000 Digital LED Operator Screen Structure
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Installation
Changing Parameter Settings or Values on V1000 Drives
Figure 4-9 V1000 Drive Parameter Settings or Values
All parameters are set at the factory. GDST has modified some of these parameters.
TABLE 4-18 GPD315 DRIVE PARAMETERS
n002 Control Method 1 This parameter must be set to 1.
n004 Reference Select 1 This parameter must be set to 1.
n008
n011 Frequency-Max
n012
n013
n019*
Reference-
Motor Operating
Voltage
Maximum
Frequency at
Motor Operating
Voltage
Acceleration
1 This parameter must be set to 1.
Most motors are rated for either 50 or 60 Hz
50 Hz
or
60 Hz
208V
230 – 240V
380 – 415V
50 Hz
or
60 Hz
0.8 seconds This parameter must be set to 0.8.
operation. The specific rating can be found on the
motor nameplate under the Hz column. If the
motor is rated at 50 Hz, this parameter should be
set to 50. If the motor is rated for 60 Hz, this
parameter should be set to 60.
This parameter must match the motor nameplate
data for Volts. If the motor is rated for dual
voltage, verify which voltage the motor has been
Most motors are rated for either 50 or 60 Hz
operation. The specific rating can be found on the
motor nameplate under the Hz column. If the
motor is rated at 50 Hz, this parameter should be
set to 50. If the motor is rated for 60 Hz, this
parameter should be set to 60.
n020*
n025*
n026*
n036
* Parameters can be changed while the inverter is running.
Deceleration
Time
Frequency
Reference #1
Frequency
Reference #2
Motor Rated
Current
0.8 seconds This parameter must be set to 0.8.
If the motor is rated for 50Hz, this parameter
5 or 6
50 Hz
or
60 Hz
0.1 to 49.5
should be set at 5. If the motor is rated for 60Hz,
Most motors are rated for either 50 or 60 Hz
operation. The specific rating can be found on the
motor nameplate under the Hz column. If the motor
is rated at 50 Hz, this parameter should be set to
50. If the motor is rated for 60 Hz, this parameter
should be set to 60.
This parameter must match the motor nameplate
information for current. This information can be
found on the motor nameplate under the column of
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Installation
Do not make changes to the program function
codes before contacting General Dynamics
cause drive malfunctions, incorrect tracking
system.
TABLE 4-19 V1000 DRIVE PARAMETERS
PARAM. DESCRIPTION SETTING HELP AZ EL
A1-02 Control Method 2 This parameter must be set to 2.
B1-02 Operation Mode 1 This parameter must be set to 1.
B1-01 Reference Select 1 This parameter must be set to 1.
Most motors are rated for either 50 or 60 Hz
50 Hz
E1-04 Frequency-Max
E1-05
E1-06
C1-01*
C1-02*
D1-02*
D1-03*
E2-01
* Parameters can be changed while the inverter is running.
Motor Operating
Voltage
Maximum
Frequency at
Motor Operating
Voltage
Acceleration
Time
Deceleration
Time
Frequency
Reference #1
Frequency
Reference #2
Motor Rated
Current
or
60 Hz
208V
230 – 240V
380 – 415V
50 Hz
or
60 Hz
0.8 seconds This parameter must be set to 0.8.
0.8 seconds This parameter must be set to 0.8.
5 or 6
50 Hz
or
60 Hz
0.1 to 49.5
operation. The specific rating can be found on the
motor nameplate under the Hz column. If the
motor is rated at 50 Hz, this parameter should be
set to 50. If the motor is rated for 60 Hz, this
parameter should be set to 60.
This parameter must match the motor nameplate
data for Volts. If the motor is rated for dual
voltage, verify which voltage the motor has been
strapped for and make this parameter match.
Most motors are rated for either 50 or 60 Hz
operation. The specific rating can be found on the
motor nameplate under the Hz column. If the
motor is rated at 50 Hz, this parameter should be
set to 50. If the motor is rated for 60 Hz, this
parameter should be set to 60.
If the motor is rated for 50Hz, this parameter
should be set at 5. If the motor is rated for 60Hz,
this parameter should be set at 6.
Most motors are rated for either 50 or 60 Hz
operation. The specific rating can be found on the
motor nameplate under the Hz column. If the motor
is rated at 50 Hz, this parameter should be set to
50. If the motor is rated for 60 Hz, this parameter
should be set to 60.
This parameter must match the motor nameplate
information for current. This information can be
found on the motor nameplate under the column of
FLA (Full Load Amps), or A (Amps).
SATCOM Technologies. Changing these parameters
NOTE:
could
of the antenna, and/or physical damage to the
All other parameters are set to the factory default or are not user configurable.
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Installation
WARNING
ELECTRICAL LIMIT SWITCH WILL NOT PREVENT OVERTRAVEL OF THE ANTENNA.
4.4.1.3 Drive Motor Phasing
Because all axis drives are bi-directional, the actual direction of antenna axis
rotation should correspond to the direction commanded by the control system. The
following procedures should be followed to ensure this correspondence (make all
control commands at the PMCU; refer to Figure 2-10).
NOTE: Prior to performing these procedures, ensure that the antenna
is clear of electrical and mechanical stop limits in all axes, preferably
with each axis near the center of travel.
IF ANY AXIS DRIVE MOTOR IS PHASED INCORRECTLY, THE CORRESPONDING
4.4.1.3.1 AZ Motor Phasing
1. Using the PMCU set the AZ SPEED ADJUST switch to the TRACK position.
2. Hold the AZ AXIS CONTROL switch to CW for a few seconds and then to CCW
for a few seconds, while observing the direction of rotation of the antenna.
3. If the direction of antenna rotation agrees with the control commands, proceed
to Section 4.4.1.3.2.
4. If the direction of antenna rotation is reversed from the commanded direction,
remove power from the drive cabinet and switch the AZ motor leads connected
to terminals Az-U and Az-W.
5. Restore power to the drive cabinet and recheck for proper AZ rotation.
4.4.1.3.2 EL Motor Phasing
1. Using the PMCU set the EL SPEED ADJUST switch to the TRACK position.
2. Hold the EL AXIS CONTROL switch to UP for a few seconds and then to DOWN
for a few seconds, while observing the direction of rotation of the antenna.
3. If the antenna movement correlates with the commanded direction, proceed to
Section 4.4.1.3.3.
4. If the direction of antenna rotation is reversed from the commanded direction,
remove power to the drive cabinet, and switch the EL motor leads connected to
terminals EL-U and EL-V.
5. Restore power to the drive cabinet and recheck for proper EL rotation.
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Installation
4.4.1.3.3 POL Motor and 4th Axis Motor Phasing
1. Hold the POL switch to CW for a few seconds and then to CCW for a few
seconds. The CW drive command should result in clockwise rotation of the feed
assembly as viewed from the rear of the antenna structure; the CCW drive
command should result in counterclockwise rotation of the feed assembly as
viewed from the rear of the antenna structure.
2. If the drive command and axis rotation are correct, proceed to Section 4.4.1.4.
3. If the drive command and axis rotation are reversed, remove power from the
drive cabinet and switch the POL motor leads connected to terminals POL CW
and POL CCW located on TB1.
4. Restore power to the drive cabinet and recheck for proper POL rotation.
5. The 4-axis systems have a 4th Axis that is part of the feed assembly. Since
many different versions of the feed arrangement exist, additional information
will be supplied as needed.
4.4.1.4 Electrical Limit Switch Tests and Preliminary Settings
CAUTION
In the following steps, jog the antenna slowly as it nears each limit to
prevent possible damage to the antenna structure because of a
malfunctioning or improperly adjusted limit switch. This caution is
necessary only during installation in order to verify that the limit switches
are functioning correctly.
1. Using the PMCU hold the AZ AXIS CONTROL switch to the CW position. As
the antenna approaches the AZ CW limit, set the AZ SPEED ADJUST switch to
TRACK and drive the antenna into the AZ CW limit. Verify that the CW
movement of the antenna stops and that CCW motion is allowed. If CW and
CCW limits are operating backward, switch wires on TB1-1 and TB1-3.
2. Using the PMCU hold the AZ AXIS CONTROL switch in the CCW position and
drive the antenna into the AZ CCW limit. Verify that the CCW movement of the
antenna stops and that CW motion is allowed.
3. Using the PMCU hold the EL AXIS CONTROL switch in the UP position and
drive the antenna into the EL UP limit. Verify that the upward movement of the
antenna stops and that downward motion is allowed.
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Installation
4. Using the PMCU hold the EL AXIS CONTROL switch in the DOWN position and
drive the antenna into the EL DOWN limit. Verify that the downward movement
of the antenna stops and that upward motion is allowed. If UP and DOWN limits
are operating backward, switch wires on TB1-4 and TB1-6.
5. Using the PMCU hold the POL switch in the CW position and drive the feed
tube into the CW limit. Verify that the CW movement of the feed tube stops
and that CCW motion is allowed. If CW and CCW limits are operating
backward, switch wires on TB1-7 and TB1-9.
6. Using the PMCU hold the POL switch in the CCW position and drive the feed
tube into the CCW limit. Verify that the CCW movement of the feed tube stops
and that CW motion is allowed.
7. The 4-axis Systems have a 4th Axis that is part of the feed assembly. Since
many different versions of the feed arrangement exist, additional information
will be supplied as needed.
If any of the limit switches do not operate in the manner described above in steps
1 through 4, discontinue operation of the system until the problem is corrected.
Limit circuit problems can usually be traced to a wiring error between the switch
and drive cabinet.
After ensuring proper operation of all limits, set the limit stops for each axis to
ensure clearance of all obstructions while allowing only the necessary total antenna
travel in each axis.
4.4.1.5 AZ and EL Speed Adjustments
Low and high-speed drive rates for the AZ and EL axes are preset parameters
inside each drive.
4.4.2 ACU Power-Up and Initialization
The procedures that follow prepare the system for site acceptance tests.
Set the drive cabinet MAINT/REMOTE switch to REMOTE to transfer control to the
7200 ACU.
Refer to Section 5.0 of this manual for operation of the 7200 ACS, especially
Section 5.6, Power-Up Procedures.
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Installation
4.4.2.1 Setting Position Parameters
See Section 5.8 for the location of applicable parameters. Appendix D, Tracking
Tutorial for Operators, may also be useful.
1. From the 7200 ACU command the antenna CW, UP, and POL CW.
2. Observe the Current Position display for increasing angles on each axis (refer to
Figure 2-9). If not, set the corresponding angular transducer parameter to
"REV".
3. Enter the station location parameters (refer to Section 5.8.6.9).
4. Steer the antenna to a satellite with known current position data. Accurately
position the antenna for maximum signal and set the position parameters to
agree with the known satellite look angles (refer to Section 5.8.6.4).
4.4.2.2 Setting Beacon Signal Level and Slope
See Table 5-8, Calibrate Tracking Signal, for additional details.
1. Adjust the antenna for maximum beacon signal level.
2. Select menu item Calibrate Tracking Signal
3. Set the 0 dB point.
3. Move the antenna off the target 3 dB and set the -3 dB point.
The system should now be ready for site acceptance tests; see Appendix F, Site
Test Procedure, for complete test information.
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Operation
5.0 OPERATION
5.1 Introduction
This section of the manual provides the procedures for operation of the 7200 ACS.
The 7200 ACS contains on-line help that is accessible by simply pressing the
[HELP] key on the front panel keypad (refer to Section 5.3 for information on the
7200 help system).
This section begins by giving the user an introduction to the 7200 ACS menu and
help systems. For clarity, all menu items (and system messages and prompts) that
appear in text will be in boldface type and shown in text exactly as they appear on
the display. All key names are presented in square brackets ([]).
The 7200 ACU has a Simulation mode that can be used for training purposes or for
becoming familiar with the system before beginning system operation. For more
information on the ACU simulator, refer to Section
Manual antenna control, instructions on how to use the tracking functions of the
system, and procedures for editing the tracking data and system configuration are
included in this section.
5.8.6.7.
5.2 The 7200 ACS Menu System
The menu system provides access to all of the capabilities of the 7200 ACS and is
structured according to system functions. The menu system is displayed in the
lower portion of the display on the front panel of the ACU and each "screen" is
titled for convenience. Items displayed that are followed by "..." are menus. The
arrow keys on the 7200 keypad may be used to place the cursor on any menu
item. If [ENTER] is then pressed, the relevant screen for the item chosen will be
displayed and depending on the item chosen, the new screen may contain one, or
a combination, of the following items:
• a function [e.g., "Return to standby (stop tracking)"]
• a parameter (e.g., "Target name")
• a menu (e.g., "Edit schedule...")
Alternatively, a user may pick an item from a visible list by entering the number of
its position in that list; (for example: to select the Tracking Functions… menu,
press [1] then [ENTER]). The menu items are numbered 0-9, starting at the top,
left column first.
On-line help is available for all menus, functions, and parameters. The help system
for the 7200 ACS is described in detail in Section
either help for the entire system, or help related to the item that is highlighted.
5.3. Pressing [HELP] will display
5-1
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Operation
Figure 5-1 shows a representation of the (Main Menu) screen as it appears on the
7200 ACU display. See Appendix G for 7200 Menu Tree software flow charts.
Figure 5-1 7200 ACS Basic Menu System
5.2.1 Multiscreen Menus
Each screen can display up to 5 lines of text or 10 menu items (5 per column). If
more information than can fit on one screen needs to be displayed, there will be a
message in the screen title as shown in Figure 5-2. To view the next screen of a
multiscreen menu, simultaneously press [SHIFT] and [ ↓ ]. To view the previous
screen of a multiscreen menu, simultaneously press [SHIFT] and [ ↑ ]. Note that
pressing [PRIOR] will return the system to the previous menu, moving up a menu
tree level. It will not necessarily return to the previous screen.
5-2
Figure 5-2 Multiscreen Menu
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Operation
5.2.2 Menu Items
Some of the menus (e.g., "Edit target parameters...") will have parameters appear
on the screen that only appear under certain conditions. As an example, when the
tracking mode for a certain target is set to Move to look angles..., Edit target parameters... will have only the following two items displayed:
• Look angles [deg]
• Bias angles [deg]
However, when the tracking mode for a target is set to Intelsat 11-element, 22
different parameters will be displayed.
Figure 5-3 shows an example of the menu that appears when Tracking functions...
is selected from the Main menu. If Immediate tracking... is chosen from that menu,
the Immediate tracking screen appears with additional items displayed. If the user
then chooses Edit immediate target..., the Edit selected target screen appears with
the relevant functions/parameters displayed.
Figure 5-3 Tracking Functions Menu System
5.3 The Help System
The 7200 ACU provides easy-to-use, on-line help. Pressing [HELP] will provide
assistance for whatever parameter or menu is highlighted. When in a menu,
pressing [HELP] twice enters the Introductory Help, which explains general system
navigation. Press the [PRIOR] key to exit any help screen.
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Operation
Figure 5-4 is an example of a help screen that describes the parameter E.
Longitude of site [deg] which is in the Edit System Configuration Menu… in the
Site data... menu. Notice the highlighted portion, “Press [HELP] for introductory
help.” This function is available in all help screens.
Figure 5-4 ACS Help Screen (Parameter Help Screen)
The 7200 help system includes information on all system functions, parameters,
and menus. Help screens may contain explanations of a parameter or a function
and any requirements for executing that function (e.g., the user level necessary to
execute the function). Figure 5-5 shows a help screen containing information on
the overall system help (Introductory help).
Figure 5-5 7200 ACS Help Screen (Introductory Help)
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Operation
5.4 System Prompts
Executing functions and changing parameters on the 7200 ACS are made simple
with the use of system prompts. For example, if a user wishes to change the
parameter E. Longitude of site [deg] shown in Figure 5-4 above, the system will
prompt the user with the allowable range of values when this parameter is selected
to be edited. Figure 5-6 shows the screen that will appear when the cursor is
placed over the parameter and the [ENTER] key is pressed.
Figure 5-6 Parameter Edit Screen
5.4.1 Error Messages for Incorrect Entries
The 7200 ACS not only provides value ranges in system prompts when the user is
editing parameters, but it also provides error messages when an out-of-range value
is entered. For example, if the user is editing the parameter shown in Figure 5-6
above and enters a value of 365.000000, the following system prompt will
appear:
Your entry 365.000000 is too high.
Enter a real number between -360.000000 and 360.000000.
Press [ENTER] to continue.
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Operation
NOTE: The defaults for the confirmation messages are set
5.4.2 Confirmation Messages
Depending on the setting of the user interface options parameters (refer to Section
5.8.6.14), the system will display tracking and editing confirmation messages, and
a warning bell may be operational to alert the user that a confirmation message
awaits a response. The bell will also sound when an invalid key is pressed.
so that the messages appear. For all operating procedures in
this manual, it is assumed that the defaults are unchanged
and all confirmation messages will appear.
The following is an example of a tracking confirmation message:
All parameters (target-specific and system) are stored in battery-backed nonvolatile
RAM on the CPU board. This includes all accumulated steptrack data.
In addition, when the ACU is powered up, it automatically resumes tracking the
target that it was tracking at the time the system was powered down. If the ACU
was in Standby at that time, it remains in Standby. There is a five-second delay
from the time the ACU completes power-up and is ready to be commanded and
when tracking resumes on the target that was being tracked at power-down time.
This gives the user the opportunity to return the unit to Standby before antenna
movement starts.
5.6 Power-Up Procedures
Before proceeding with these power-up procedures, be sure that Section 4.0,
Installation and Initial Setup of System, has been followed to install, set up, and
configure the system.
To power up the 7200 ACS, use the following procedures.
1. On the 7150 Drive Cabinet, pull the EMERGENCY STOP switch to the out
position.
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Operation
2. On the 7150 Drive Cabinet, set the following controls as indicated:
a. Set the Main Circuit Breaker to ON
b. Set all remaining Circuit Breakers to ON
c. Set MAINT/REMOTE switch to MAINT
3. On the 7200 ACU back panel, set the on/off switch to the on position.
5.7 Manual Movement of the Antenna
5.7.1 Manual Movement From the Drive Cabinet (PMCU)
Manual control of each axis is provided at the drive cabinet by using the PMCU,
primarily to facilitate antenna maintenance. A MAINT/REMOTE switch (CONTROL)
located on the Relay PCB. It is the only selection point for maintenance mode.
Therefore, with this switch in the MAINT position, the ACU cannot assume
control. With the switch in the REMOTE position, the ACU has control of the
system and the drive cabinet switches are inoperative.
To operate the antenna from the drive cabinet, use the following procedures.
1. On the drive cabinet, set the CONTROL switch to MAINT to enable the controls
on the PMCU.
2. Set the AZ SPEED ADJUST to TRACK. The slew and tracking speed parameters
are set in the drives. (SLEW is a fast speed. TRACK is a slow speed.)
3. Hold the momentary AZ AXIS CONTROL to the CW or CCW position. Holding
the switch at CW results in clockwise motion of the antenna as observed from
the rear of the antenna. Holding the switch at CCW results in counterclockwise
motion of the antenna. When released, the switch automatically returns to the
center (off) position.
4. Set the EL SPEED ADJUST to TRACK. The slew and tracking speed parameters
are set in the drives.
5. Hold the momentary EL AXIS CONTROL switch to the UP or DOWN position.
Holding the switch at UP results in upward motion of the antenna and holding
the switch at DOWN results in downward motion of the antenna. When
released, the switch automatically returns to the center (off) position.
6. Hold the momentary POL switch to the CW or CCW position. Holding the
switch at CW causes the feed assembly to rotate CW as observed from the rear
of the antenna and holding the switch at CCW causes the feed assembly to
rotate CCW. When released, the switch automatically returns to the center (off)
position.
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Operation
7. The 4-axis system has a 4TH AXIS that is part of the Feed Assembly. Since
many different versions of the feed arrangement exist, additional information
will be supplied as needed.
8. Press the RESET button located on the Digital Operator console to clear any
faults detected by the motor controllers (inverters). Refer to Section 4.4.1.2.1.
9. Return MAINT/REMOTE switch to REMOTE.
5.7.2 Manual Movement From the ACU
Refer to Section 5.8.2.5 for instructions on manually controlling the antenna from
the ACU.
5.8 The 7200 ACS Main Menu
All operation of the 7200 ACU is through the Main Menu. See Appendix G for
7200 menu tree flow charts. The Main Menu gives the operator a choice to select
a function for the 7200 ACU to perform or to select another menu where more
functions are available or where parameters can be changed.
For example, the Main menu has three functions: Return to standby (stop tracking), Clear/correct system faults and Redraw the display. It also has four
menus:
• Tracking functions...
• Set user level (and passwords)...
• Display system status...
• Edit system configuration...
Figure 5-7 shows a representation of the Main menu screen as it appears on the
7200 ACU display.
Figure 5-7 7200 ACU Main Menu Screen
5-8
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Operation
NOTE: To return to the Main menu from any screen, press the
[Shift] key and hold it while pressing the [PRIOR] key.
The following sections describe each of these functions and menus.
5.8.1 Return to Standby (Stop Tracking) Function
Selecting Return to standby (stop tracking) places the system in Standby mode. In
Standby mode the antenna is not being commanded to move by the ACU. Realtime status, signal level, and position information is still displayed on the ACU front
panel. Any current fault information is also displayed.
The AZ and EL inverters are powered up but are not enabled, and on systems
equipped with brakes, the brakes are set. In Standby mode, the ACU is in an
active wait state for instructions from the front panel and computer interface(s).
During tracking, the ACU may be commanded to stop tracking and return to the
Standby mode by selecting the Return to standby(stop tracking) function. For
convenience, the function is included in two menus: Main menu and Tracking
functions menu.
5.8.2 Tracking Functions Menu
All antenna control, including manual antenna control, is accessed from the Main
menu. The Tracking functions… menu includes the following functions and menus:
• Return to standby (stop tracking)
• Track a target...
• Modify current target...
• Immediate tracking...
• Manual antenna control
• Edit a new or existing target...
• Target scheduler...
The following sections will describe each of these functions and menus.
5.8.2.1 Return to Standby (Stop Tracking) Function
Return to standby (stop tracking) is the function that appears under the Main menu
and it is also available under the Tracking functions... menu for convenience.
When this function is selected, the system will prompt the user to ensure that the
user wishes to stop tracking and return the ACU to Standby mode. In Standby
mode, the status line of the ACU will indicate Standby (no tracking in progress or
pending).
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Operation
5.8.2.2 Track a Target Menu
The Track a target menu allows selection of a preconfigured target to track. When
this menu is selected, if there are no previously configured targets, the screen will
appear as shown in Figure 5-8. For instructions on entering targets into the target
selection menu, refer to Section 5.8.2.6.
Figure 5-8 Track a Target Screen
Although individual tracking modes are directly accessible through the Immediate
tracking... menu, primary 7200 ACS operation is through the Track a target...
menu. This target-oriented environment consists of preconfigured targets that
include the desired tracking mode. Multiple, unique data bases are simultaneously
maintained for all targets. The user simply selects the name associated with the
desired target and the ACU automatically invokes the mode, or series of modes,
and the predictive tracking data base(s) established for that target.
To track a target in the target selection menu, use the following procedures:
1. From the Main menu, select Tracking functions..., and Track a target....
2. Using the arrow keys on the 7200 ACU keypad, move the cursor to the desired
target and press [ENTER].
3. A prompt will appear to confirm that tracking should begin at the preconfigured
position. To begin tracking the target, toggle the [YES/NO] key to [YES]. To
cancel the tracking function, answer [NO], and the ACU will return to the Track a target... screen.
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Operation
When commanded to begin tracking the target, the system will move the antenna
to the target's position and maintain that position. The name of the target remains
on the display under the antenna name.
5.8.2.3 Modify Current Target Menu
From this menu, the user can modify the target currently being tracked. The items
under this menu vary according to the tracking mode of the current target.
•Tracking receiver parameters... is available in all tracking modes and is the only
item displayed when the system is in Standby.
• Manually bias target is available in all tracking modes, but not in Standby.
• Edit current target... is available for all tracking modes, allowing the user to edit
the Target name, Tracking mode, and target parameters.
• Reset OPT target is only available when a target's tracking mode is OPT.
• Set star time bias... is only available for targets configured for the Star tracking
mode.
5.8.2.3.1 Manually Bias Target Function
NOTE: The Manually bias target function is not available when the
system is in Standby mode.
The Manually bias target function allows the user to create a bias for a target
preconfigured with any tracking mode (except OPT); the functionality varies
according to the selected tracking mode of the target. This function is used to
peak polarization on targets with OPT tracking modes -- i.e., OPT's polarization
predictions are "calibrated" by adjusting polarization as the target moves along its
orbit. Figure 5-9 is an example of how the front panel display looks when manual
biasing is being performed on a target preconfigured for the OPT mode.
Figure 5-9 Manually Bias Target Screen
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Operation
Although the screen in Figure 5-9 is titled Manual antenna control, only biasing can
be performed from this screen. Paragraph 5.8.2.5 explains how to manually
control the antenna from the ACU.
For a target with a tracking mode of Move to look angles, Move to longitude,
Intelsat-11 element, and Star tracking, the bias can be thought of as a "targetspecific offset". Targets with these tracking modes have a parameter, Bias angles,
which has a value in degrees for each axis. When the ACU is tracking a target,
the command position is computed using the appropriate technique for the tracking
mode, and then the bias angles are added to create the final command position to
which the ACU drives the antenna.
Use the following procedures to perform manual biasing:
1. From the Main menu, select Tracking functions...; then select Modify current
target..., and Manually bias target. The following prompt appears:
Enter manual antenna control to bias the current target? (yes/no)
4. If the user answers yes, the command position is subtracted from the current
position on each axis and stored as the target's bias. If the user responds no,
the ACU will move the antenna to the position computed for the target,
effectively "undoing" the manual antenna movement.
Because the Immediate tracking... modes are used for immediate tracking only
(i.e., the antenna is commanded to move to a position and is held there), none of
these modes have bias angles. For more information on Immediate tracking...,
refer to Section 5.8.2.4.
5.8.2.3.2 Tracking Receiver Parameters
The parameters for the Tracking receiver parameters... menu vary according to the
setting of Shell under the Remote port configuration... menu (refer to Section
5.8.6.12).
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Operation
If Shell is set to DTR, the parameters in Table 5-1 will appear. If the Shell is set to
253_REC the parameters in Table 5-2 will appear. If Shell is set to TRL, the
parameters in Table 5-3 will appear. For all other Shell settings (Disabled, Printer,
M&C, Visual, etc.), the parameters in Table 5-4 will appear.
TABLE 5-1 DTR PARAMETERS
PARAMETER DESCRIPTION
Frequency [MHz] Frequency for the tracking receiver.
RF input Selects RF (polarization) input to the tracking receiver.
FFT sample averaging controls this same function on the DTR. Increasing
FFT Sample Averaging
Filter Bandwidth This index value selects the DTR bandpass filter bandwidth.
DTR Detection Type
this value will improve the stability of the signal. Decreasing the value
improves response time.
This selects the detection type used by the DTR. This is only available on
DTR receivers with "wideband" option; on standard DTRs, this will be
ignored. The default is "FFT signal", which is the only detection type
available on non-wideband DTRs. Consult the DTR Operations and
Maintenance Manual for further information.
TABLE 5-2 253 PARAMETERS
PARAMETER DESCRIPTION
Frequency [MHz] Frequency for the tracking receiver.
A/D channel The ACU A/D channel is connected to the analog signal output from the
receiver.
Bandwidth Selects narrow IF Bandwidth of the 253 Receiver
TABLE 5-3 TRL PARAMETERS
PARAMETER DESCRIPTION
Frequency [MHz] Frequency for the tracking receiver.
Attenuation [dB] Attenuation setting for the tracking receiver.
RF input Selects RF (polarization) input to the tracking receiver.
TABLE 5-4 ANALOG TRACKING PARAMETERS
PARAMETER DESCRIPTION
A/D channel The ACU A/D channel is connected to the analog signal.
Beacon One of four available beacon signals.
Tracking signal input is only used for signal-based tracking (i.e., Steptrack and
OPT). If the system is performing other types of tracking, the operator may want
to see what the tracking receiver "sees" for a particular beacon frequency.
For targets tracking in OPT, changes to these parameters remain in effect until the
target is restarted (or power is cycled). To permanently change a tracking signal
source, the system must be at Supervisor level and the changes must be made by
accessing the Edit a new or existing target... menu (refer to Section 5.8.2.6).
To edit any of the parameters under this menu, use the following procedures:
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Operation
1. From the Main menu, select Tracking functions...; then select Modify current
target... and Tracking signal parameters....
2. Using the arrow keys, move the cursor to the parameter to be edited and press
[ENTER]. Using the numeric keys, enter a value within the range specified in the
system prompt and press [ENTER].
3. Press the [PRIOR] key and the following prompt appears:
Save changes to menu "Tracking signal parameters"? (yes/no)
4. To save the changes, toggle the YES/NO key to YES and press [ENTER].
5.8.2.3.3 Reset OPT Target Function
The Reset OPT target function is only available when an OPT target is being
tracked. If this function is selected, the user is prompted to verify that the user
wants to erase all stored steptrack data and orbital models for the current target.
This is not required for normal operation. If the ACU is tracking poorly under OPT,
it may be necessary to use this function to cause OPT to discard poor steptrack
data and/or orbital solutions it has generated and stored.
Executing this function does not change any of the target's Steptrack or OPT
configuration parameters.
5.8.2.3.4 Set Star Time Bias Function
The Set star time bias... function is only available when a star target is being
tracked. The bias is a time value that is added to the current time to determine the
point in the star's trajectory to which the ACU will point.
By default, the star time bias is 00:00:00, which means that the ACU is tracking
the star in real time. If the bias is changed to a nonzero number, the ACU will "run
ahead" of the star by that amount of time. For example, if the star time bias is
00:01:00, the ACU will run 1 minute ahead of the star.
To edit the Set star time bias..., select the function, select Time bias, and enter the
desired numeric values (within the range of values specified in the system prompt).
5.8.2.3.5 Edit Current Target Menu
The function of this menu is identical to the function of the Edit a new or existing
target... menu (refer to Section 5.8.2.6), and is placed under Modify current
target... for convenience when modifying the current target.
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Operation
PARAMETER
DEFAULT
DESCRIPTION
g of
the next cycle when no OPT solution is available. For immediate
3 dB of the antenna. Used by Steptrack and OPT to
teptrack
algorithm approximates a curve and samples points along that curve.
3 dB receive beamwidth of
between the previous estimated peak position and the current peak
is measured radially
between the AZ/EL pairs. As in system configuration parameters, this
deadband setting affects AZ and EL only. When the antenna moves to
3 dB
for systems with standard
5.8.2.4 Immediate Tracking Menu
Immediate tracking allows the user to begin tracking without first configuring a
target. This method of tracking is useful for testing purposes and moving the
antenna to odd locations. To track a satellite for operational use, a target should be
configured for that satellite -- refer to Section 5.8.2.6 for details on configuring
targets.
This menu contains the following menus:
• Track Immediate Target...
• Edit Immediate Target...
Some tracking modes are target-specific. For example, OPT is not available through
Immediate tracking and Steptrack is not available through Edit a new or existing
target. For that reason, Steptrack mode is explained in this section while others are
explained in Section 5.8.2.6.2.
5.8.2.4.1 Steptrack Parameters
Table 5-5 describes the steptracking parameters and lists the default settings for
each parameter.
NOTE: Before changing any of the steptrack parameters, read the
information about that parameter in Table 5-5.
TABLE 5-5 STEPTRACK PARAMETERS
Sets time between the end of one Steptrack cycle and the beginnin
Cycle time 00:02:00
Receive -3 dB
beamwidth [deg]
Step size [deg] 0.040
Position deadband
[deg]
5-15
0.450°
0.040
Steptrack, this is the only cycle time used. In addition, this time is used
when excessive discrepancies exist between the OPT models and the
steptrack pointing.
The receive determine deflection from beam center. The value is normally supplied
with the antenna’s specs.
Sets the size of each step that the antenna makes as the s
This step is also used for steptrack operations in OPT tracking. The value
should be set to approximately 8% of the the given antenna, but no less than 0.02 with standard encoders.
Steptrack moves the antenna closer to the peak signal until the difference
position is less than the deadband. This difference
within this deadband of the peak signal, steptracking stops for that cycle
and peaking is complete. The value should be less than 10% of the receive beamwidth, but greater than 0.01°
encoders.
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Operation
k signal. Nominal value is 5, but the
eptrack
operations. The rate estimates are only made when no OPT solution
exists for the target being tracked. If an OPT solution is available, the
very fast target. For a stationary
3 dB beamwidth.
ting system
which is determined automatically. This parameter can be used to
magnify the internal weighting under special situations. The nominal
General
signal rises above this level before attempting another steptrack cycle.
NOTE: Setting this value too close to 0 dB will interfere with proper
arameter is used in both standalone steptrack and OPT to initiate
rger than the "Low tracking
signal level" will effectively disable this parameter. The default value,
B], it will only do steptrack cycles at
Allows selection of which axis is peaked first during steptrack cycle.
Normally, the axis for which the satellite has the greatest apparent
the satellite is more AZ than EL. Otherwise, set this parameter to EL.
Unless the spacecraft's inclination is high (greater than approximately 5
ct, and may be left at the
This sets the number of signal readings taken at each position during
The value should be between 3 and 70.
TABLE 5-5 STEPTRACK PARAMETERS
PARAMETER DEFAULT DESCRIPTION
Limits the number of AZ and EL cycles (attempts) that the steptrack
Maximum no. of
cycles
5
algorithm makes in finding the pea
value should be decreased for a very fast target as steptrack assumes
target is fixed for duration of steptrack operations.
Sets the cycle at which rate estimates will be made during st
Cycle to start rate
estimates
Peaking correction
limit (%BW)
Weight adjustment
value
Low tracking
signal level [dB]
3
30
1.00
-10.00 dB
rates used by steptrack are obtained from OPT. The nominal value is 3,
but should be decreased to 2 for a
target, the value should be set to 5.
Sets the maximum beam radial distance steptrack will adjust the antenna
pointing in one cycle. The value is given in percent of -
Nominal value is 30% -- this can be lowered to 10% to limit the steptrack
working area but will inhibit the ability of steptrack to peak on a highly
inclined satellite.
The steptrack algorithm combines data together by a weigh
value is 1.0 and should not be changed unless directed by
Dynamics personnel. Increasing this value decreases the responsiveness
of steptrack.
Defines the lowest signal level that steptrack can work with to perform
its operations. If the signal falls below this level while steptracking, the
ACU will display a Low tracking signal level message and wait until the
steptrack operation.
This p
steptrack operation if the signal drops by this many dB between steptrack
operations. In a noisy environment, a small value will cause excessive
steptrack operations. Setting this value la
Signal threshold
[dB]
Axis to peak first Elevation
# of samples 10
5-16
15.00 dB
15.00 dB, is less than the default "Low tracking signal level, and for most
applications (and all OPT tracking), it should remain so. While the ACU is
waiting for the cycle time to expire (to begin a new steptrack cycle), if
the signal falls by this many dB below the most recently acquired peak, it
will do a steptrack cycle immediately. If the signal threshold is set below
the Low tracking signal level [d
intervals given by Cycle time.
motion is peaked first. Select AZ only if the required motion for following
degrees), this parameter has no noticeable effe
default.
steptrack. The default is 10, which is good for virtually all applications.
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