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Almos
16
LLWAS
Low Level Windshear Alert System
The advantage of this shared configuration database approach is that systemwide
configuration can be achieved through reconfiguration of a single
central source file. The configuration database is centrally stored and changes
to this file are automatically integrated by MetConsole instances operating
across the network.
2.1.2.6 Master Station LLWAS Displays
All MetConsole screens are constructed using a configuration database. This
configuration database defines the names of each
‘screen’, the ‘screen objects’ to be displayed on
each screen, and the data item(s) to be displayed
by each ‘screen object’.
This design is extremely flexible and allows a
maintenance engineer to easily change the LLWAS
screens to reflect new additional sensors and other
equipment.
A number of screen objects are non-LLWAS specific, and will be used on
Maintenance and server displays to display the current status of various
variables such as sensor status, detected wind speed & direction etc. (LLWAS
display objects are described under the section titled Display Equipment.
2.1.2.6.1 System Overview Window
A ‘System Overview’ window provides a tree control containing all configured
remote stations, configuration parameters and statistics, and communications
information (also available in comprehensive form through a separate ‘Ports’
window).
Figure 2 - The system overview window provides comprehensive data views.
CONFIGURATION
DATABASE
(METCFG.MDB)
RAW CONFIGURATION FILES
& PARAMETERS
SHARED DATABASE
(BOTH SERVERS)
LLWAS MetConsole Display Configuration Overview
SCREENS
SCREEN OBJECTS
OBJECT TYPES
TELVENT Low Level Windshear Alert System
Almos
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LLWAS
Low Level Windshear Alert System
The ‘System Overview’ window will only be accessible by the Maintenance
user and is not required for ATC users.
This window provides information about each LLWAS data variable, overall
communications status, and specific Remote Station diagnostic information.
Variable information may also be queried from all user screens, if the user has
sufficient security access.
Figure 3 - Query data from a user screen.
Variable information includes comprehensive data query options, with all
variables displayed in logical category divisions.
Figure 4 - Remote Station data views – LLWAS remote station statistics
TELVENT Low Level Windshear Alert System
Almos
18
LLWAS
Low Level Windshear Alert System
A System Overview tree display is also provided in the System Overview
window, and displays the current connection status of all remote
components of the LLWAS system in a graphical and easy to read manner.
Figure 5 - System overview (Sungshan airport example)
Having well organized graphical tools to aid in diagnosing faults and
troubleshooting ensures simple system maintenance.
2.1.3 Remote Station (RS)
The Almos Systems Remote Stations (RS) are also called Wind Automatic
Weather Station (WAWS). The function of these devices is to collect and
transmit wind speed and direction information back to a central monitoring
site.
The acquired data is transmitted to a Master Station Communications Set
(MSCS) at the central monitoring facility via a radio network (radio option) or
optional landline network (landline option).
Up to 16 radio or 20 landline WAWS can be connected to one MSCS. With
multiple MSCS, one Low Level Wind Alert System (LLWAS) may have up to
256 WAWS units.
The WAWS may be powered from 120VAC / 60Hz, 220VAC / 60Hz or
240VAC / 50Hz or from a Solar Power Set.
TELVENT Low Level Windshear Alert System
Almos
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LLWAS
Low Level Windshear Alert System
2.1.3.1 System Description
The WAWS includes the following electrical subassemblies:
• ALMOS 2100-Z CPU Board
• Power Supply System
• Radio Interface and Radio Heater (Radio Option)
• Radio & RF Surge Suppressor (Radio Option)
• Line Isolation Board (Optional Landline Option)
• Solar Power Set (Solar Power Option)
• Stainless enclosure
• Designed for extreme environmental conditions:
• Altitude: 10,000 feet operating, 50,000 feet non-operating.
• Operating temperature: -40C to +70C
• Blowing Rain: Present
• EM interference: FCC class A compliant
• Humidity: <15% to 100% operating.
• MTBF: 272,945 hours (31.2 years)
For the location of the items inside the WAWS, refer to drawing
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