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1F. Closed garage with acoustic detector

Dimmable HF operating devices, with daylight-related ‘Dynamic Lighting control’ and four levels
Svenskt patent nr. 9201493-5, English patent No. 0659329


For a closed single-level garage, acoustic technology is unsurpassed it is the only technology that permits activation before entry into the premises. For multi-storey open garages we refer to detection using IR detectors.

Light sources

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

Control system

With new buildings or renovations where there is the possibility of selecting fittings with dimmable operating devices, installation must be in accordance with the principle ‘Daylight-Related Dynamic Lighting Control’. The technology can be used for control using both acoustic and IR detectors. See wiring diagram below. Using NV-4T, dimmable fluorescent-tube fittings can control up to four light levels.

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.

Thanks to a light sensor, the lighting switches between a ‘day program’ and a ‘night program’ in NV-4T. In the daytime the light level is adjusted to about 80 per cent, and after onset of darkness the level is about 30 per cent in the event of presence. This means your eyes can more easily adjust to the light when entering and leaving the garage. The energy saving is furthermore about 20 per cent during daytime operation and about 70 per cent in the evening and night-time with the lighting activated. When the presence ceases (daytime and night-time) the lighting is first reduced to about 2 per cent of basic light, and after about 1 – 2 hours it is completely deactivated to eliminate no-load losses.

See the diagram below! See application 1D with two lighting levels, without daylight-dependent control.

Positioning of detectors

The microphones should be positioned at up to twice the radius between them. The range of the microphones can be 20 – 25 m radius depending on acoustic conditions. Ceilings provided with acoustic plates can reduce the range of the HF signal. Connection of the microphones, which are connected in parallel, can use EKKX 1 x 4 x 0.25 mm2.

Product Order No.
Acoustic detector AD-600 13091
Level selector NV-4T 13171
Light sensor LS-10 13100
Microphone AD-260U 2 ea. 13106
Contactor 20480
Microphone AD- 260P 2 ea. 13105
Product Maximum current consumption (mA)
Microphone AD-260 22
Level selector NV-4T 110
Lighting control according to the light source manufacturer’s recommendations

Effect of temperature on the life of HF ballasts.

Running light sources at just 80 per cent and running ballasts at 80 per cent (including losses) gives a squared reduction in the heat generated in the light fittings. It also allows the installation to be run more intermittently, i.e. the lighting can be switched on for many short periods, which again reduces the temperature of the light fittings. This results in a lower steady state temperature, which significantly increases the life of HF ballasts.