Cerberus® AlgoRex Lightning and overvoltage protection for fire detection systems Planning Fire & Security Products Siemens Building Technologies Group
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Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Definitions and abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1 1.1 1.2 The effects of lightning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Remote strokes of lightning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
II Fire & Security Products Siemens Building Technologies Group 03.
Introduction The increasing use of modern electronics in industry, business and the domestic sphere, inevitably leads to higher occurrences of faults and damage in equipment and systems caused by overvoltages from the effects of lightning. Similarly with fire detection systems, such interference and damage are, apart from the costs involved, annoying for customers, the fire department and insurers.
1 The effects of lightning With lightning, we differentiate between remote, local and direct strokes. 1.1 Remote strokes of lightning Remote strokes of lightning generate overvoltages which usually reach the fire detection system via the supply mains and remote transmission lines. The overcurrents thus generated are mainly below 100A and normally can be dealt with using a protective device with medium discharge capacity.
Protection zones Zone 0/E (below roof) Zone 1 Zone 0 Zone 0/E 20m Zone 1 0,5m Zone 2 Zone Zone Zone Zone 0,5m Zone 2 0 (white) 0/E (checked) 1 (light grey) 2 (dark grey) Fig. 1 0,5m 2 Zone 2 Zone 1 outside the building below the roof area (0.
3 Overvoltage protection devices (ÜSG) Overvoltage protection devices serve to reduce induced overvoltages on the supply mains or signal lines to a level which is not harmful to the equipment connected. They consist of gas discharge diverters, inductors and varistors and must be able to withstand current surges of sometimes up to 100kA. The overvoltage protection devices are divided in three categories: basic, medial and ultimate protection devices. i 100kA 50kA (3µs) Fig. 2 3.
3.4 Ultimate protection devices (surge protectors) Ultimate protection devices for the protection of telecommunication and data lines are usually already installed in electronic equipment and consist of Transzorb, suppressor and/ or Zener diodes. Ultimate protection devices can only limit small overvoltages and overcurrents. Purely ultimate protection devices are sufficient in lines which run exclusively through zones 1 and 2.
4.3 Fire detection lines D Ultimate protection must be installed in all D-Bus users as well as in the corresponding line interface cards. D Fire detection lines which leave buildings must also be equipped with basic and medial protection. D Fire detection lines in church towers, parts of towers or castles are also endangered inside the same building. D Fire detection lines are also endangered in roof areas and on outer walls as well as in long loop lines (>1000m).
Double basic protection D Double basic protection is necessary for junctions to other buildings if the buildings are more than 50m apart. Ü With double basic protection, in addition to medial protection, an overvoltage protection device must be installed at each building entrance and exit. Where possible avoid using overhead lines. However, if an overhead line has to be used, double basic protection is always essential.
Bus type " 5 Requirements overvoltage protection devices and other filters must comply with when used for fire detection systems 5.1 Limit values of the overvoltage protection devices for different line types for fire detection systems AnalogPLUS lineInteractive line Collective line Supply lead 24V Capacitance max. 10% of the max. permissible line capacitance not critical not critical max. 1.4nF max. 100nF Inductance ≤1mH not critical not critical max.
5.2.2 Basic protection IsoProData-150V/150V-Tr Mounted on U-shaped section according to DIN EN 50022 U nominal 150V/150V I per core 1.5A R per core 0.3Ω L per core 56µH 5.2.
Voltage surge protectors and Transzorb diodes for C-Bus and LON-Bus Medial protection with Transzorb diodes Basic protection with voltage surge protectors A B 10m 1N6285A 5 Transzorb diode 1N6285A ~9 ~60 Fig. 7 Basic protection with voltage surge protectors and medial protection with Transzorb diodes 5.3 Mains leads 5.3.
5.3.3 Block diagram / Dimensions L1 (L3) L2 L1 L2 (N) L1 (L3) L2 (N) 90 Blitz und Über spannungsbegrenzer Wenn LED trotz anliegender Netzsp. nicht leuchtet, Begrenzer ersetzen 45 LEUTRON EnerPro282Tr EnerPro282Tr UN 230/400 V~ ISN 15 kA/pro Ader Pk PE 35 50 PE 64 L2 L1 L1 L3 L2 L3 LEUTRON EnerPro283Tr 90 45 L1 Blitz und Über spannungsbegrenzer Wenn LED trotz anliegender Netzsp.
6 Installation instructions Effective lightning and overvoltage protection can only be achieved using methods of HF technology. In addition to the choice of suitable overvoltage limiters, correct installation and earthing are of special importance. 6.1 Installation instructions for basic protection devices The basic protection device must be installed as close as possible to where lines enter the building.
6.2 Installation instructions for medial and ultimate protection devices for telecommunication and data lines Medial and ultimate protection devices must be installed close to the equipment to be protected (e.g. control unit). Ensure that the control unit and overvoltage limiters have a single common discharge earth which is connected to the power line earth by a wire at least 1.5mm2. Base L = Inductance of discharge earth U + –L di dt 2 earths = incorrect 1 earth = correct Fig.
6.2.1 Several filters (5 upwards) Install preferably in their own steel sheet housing flanged to the control unit housing (e.g. terminal box, part no. 433 224) or build into a compartment of the control unit housing separated by a metal dividing wall. The common neutral point should basically be the earth terminal of the overvoltage protection device.
6.3 Cable with shielding The cable shielding must be connected through each detector not earthed, but connected on the control unit side to the protective earth direct. The other end of the shielding must be earthed locally via a high performance surge protector. Control unit Common neutral point Fig. 10 Example: Stub line Fig. 11 Example: Loop line Control unit Common neutral point 15 Fire & Security Products Siemens Building Technologies Group e1683c 03.
Siemens Building Technologies AG Alte Landstrasse 411 CHC8708 Männedorf Phone +41 1 − 922 61 11 Fax +41 1 − 922 64 50 www.cerberus.ch 16 Fire & Security Document no. Products e1683c Siemens Building Technologies Group Edition 03.2002 Manual DS11 Section 10 Back 03.
