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| Fully automatic ventilation and pre-heating of plasma screen columns | | A Pleasant Temperature | Plasma screens can be used in a very bright environment thanks to their bright, richly contrasted picture. The Austrian Academy of Sciences (Österreichische Akademie der Wissenschaften, ÖAW) exploits this fact and uses plasma screen columns in the facade of one of its buildings. Their ventilation and pre-heating is controlled reliably by LOGO!
The traditional Austrian Academy of Science (Österreichische Akademie der Wissenschaften, ÖAW) with its headquarters in Vienna is the leading non-university research body in Austria. The historical Old Hall in the immediate vicinity of the main building was recently modernized and has become a multifunctional center with a contemporary infrastructure. A meeting place between science and the public has been created in the very heart of Vienna which promotes an understanding for science, research and technology.
Three plasma screen systems have been integrated in the facade of the Old Hall. The logos of the respective tenants but also selected motifs can be flashed over the screens. The three systems each consist of a vertical U-profile flush with the facade with a height of 12.5 meters and a width of one meter. The screens behind glass have an area of 150 x 100 centimeters each. The venting unit with temperature and moisture sensor is located above the top screen. There is a filter unit with ?P monitoring, temperature and moisture sensor, eheating with safety thermostat and air current monitor below the first screen. The plasma screens are controlled and monitored by an image processing center.
The conditions must be right
Engineer Christof Heinisch, Komfort-Haustechnik, Vienna was responsible for the planning and execution of the control solution. LOGO! takes care of the ventilation and pre-heating of the plasma screens. The very good price-performance ratio of the logic module was just as convincing as its flexible handling and ability to handle relatively complex tasks too. LOGO! continuously monitors the systems for moisture and temperature conditions. A request of the screen center to the monitors is allowed within the permissible conditions and time slots. Then the fan units are started up in four stages. Then the power for the plasma monitors is switched on.
Outside the time slots, the plasma screens are deactivated when specific temperature and moisture values are exceeded or dropped below. If the screens are not requested and specific outside air conditions are exceeded or dropped below, LOGO! activates the ventilation in the low stages and pre-conditions and ventilates the systems.
If temperature values are exceeded or dropped below or other safety devices respond, a collective fault message is sent to the image processing center. The individual fault messages can be read in plain text on the LOGO! The message filter moved appears with a countdown display. When this has reached zero, the screens can only be reactivated after changing the filter. In this way, LOGO! ensures that the valuable systems are always operated safely and reliably. It is also planned to add the INSYS GSM compact modem to the LOGO! controller which is able to send the fault messages to 40 cell phone numbers by SMS. This makes it possible to respond even faster and more flexibly to safety problems.
GO! 1 / 2007 | |
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