1C. Open garage with passive IR detectors

If the garage is on several levels or designed as a multi-storey with openings to the outside, passive IR technology must be used. This also makes it possible to subdivide large garages into different areas to avoid lighting unused areas. This application shows subdivision into four different areas controlled separately. At the entrance vehicles turn left or right and thereby light up the side and area in question. A disadvantage of IR detectors is that high vehicles may conceal the detector.

The fittings in this garage have dimmable HF operating devices with analogue control (1 - 10 V).

In this example the lenses have been replaced by Nos. 41 and 45. The range of these lenses is 41 and 58 m respectively and two long-distance fields of up to 83 m. The opening angle is 90°. This means they must be positioned in corners and in intercepting locations in front of entrances so that passage will be at 90° to the fields of detection. The example provides good insight into how to optimise positioning of the detectors. Unfortunately one all too often sees detectors mounted flat on the wall and aimed at doors and entrances, with the consequence that detection is considerably impaired.

Installation of the detectors should be using the simplest possible cable, Type EKKX 1 x 4 x 0.25 mm2. All detectors should be connected in parallel with the rectifier EXE-2000, even if they form part of different areas.

Regarding adjustment of the IR detectors one is referred to the manual enclosed with the detector. NV-2T level selector is also available with DSI control (NV-2TDSI).

With new buildings or renovations where there is the option of selecting fittings with dimmable operating devices, on the basis of proven experience and the state of technology it is now a serious mistake not to introduce installation in accordance with the Dynamic Lighting Control principle. The technology can be used both with acoustic control and with control using IR detectors. The wiring diagram for Dynamic Lighting Control using IR detectors is shown below.

The most important advantages attained using Dynamic Control are as follows:

• Evenly distributed basic light without extra fittings, operating at a level of 100 per cent.
• The possibility of saving 20 - 25 per cent during operation.
• Lower working temperature in the fittings, resulting in a lower life.
• Fewer activations and less power supplied, reducing wear on the fluorescent powder and resulting in a longer life of the light sources.
• The possibility of avoiding adherence to the light-source manufacturers' recommendations regarding burning times, thus drastically reducing the operating times and increasing the saving.

With knowledge of current technology, it is bad practice not to utilise Dynamic Control in frequently used premises.

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