With soft floors, angles, screened-off areas and concealed doors in closed premises, a combination of IR detector and AD-300 acoustic auxiliary detector is often the optimum solution, providing maximum comfort. A prerequisite for this solution is for the corridor to be closed, i.e. doors to all other areas must normally be shut. Acoustic detection alone is unsatisfactory because of the soft floor.

Light sources

This application shows an example of fittings with dimmable HF operating devices.

Control system

The dynamic system features fittings with dimmable HF operating devices, presence detection and a level selector. The Dynamic lighting control provides the following function:
During presence the lighting is activated at a level of about 80 per cent. One minute after presence has ceased the lighting is dimmed to about 2 per cent. Upon entry into the corridor the lighting is immediately increased back up to 80 per cent. After 2 hours without any presence the lighting is switched off completely. NV-2T level selector is also available with DSI control (NV-2T DSI).

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.

Unlike with IR technology, the AD-300 acoustic auxiliary detector can activate the lighting before entry into the corridor, creating a very high level of comfort. This facilitates optimisation of tricky corridor solutions where one cannot justify mounting IR detectors all over the place to achieve tolerable detection. The AD-300 is thus a ‘lighting activator’ that complements the IR detector in this example and plan.

With entry into the area through a ‘concealed door’ it is to be assumed that the person in question will not stay outside this door for long, but will fairly soon go out into the main passageway, where the IR detector will take over detection. Any effect on the sound detector or IR detector will prolong the time by the period set for the detector in question. Both detectors are coupled to an auxiliary relay against load/contactor to avoid 230 VAC going into the detectors.

Regarding existing installations in which older 50 Hz or non-dimmable HF fittings have not been replaced by dimmable ones, we refer to Application Example 2C.

Detector positioning and choice of lens

The positioning of the IR detector is crucial to optimum function.
See description in Application 2C for correct positioning of detectors and choice of lens.

Information for current budget

The yellow area shows the energy consumption with lighting control according to the light source manufacturer’s recommendations.
The green area shows the energy consumption with lighting control installed.

A day in October compared with corridor/aisle with no lighting control at all (yellow area).
When there is adequate daylight the light sensor in PD-2200 prevents the lighting from switching on.