In classrooms (or conference rooms), incorrect skills should not be passed on. Pupils should not learn that lighting is automatically switched on and off, but should instead be taught to switch on as necessary (the classroom gets natural light through the windows) and to switch off after themselves. It must also be possible to switch the lighting off when watching films etc.
In classrooms and conference rooms IR detection with Special Lens 51 is used. It provides the maximum possible resolution and thus the capacity to detect small movements.

Light sources

This application shows an example with light fittings that have 50 Hz coil ballasts, non-dimmable or dimmable HF ballasts. In the latter case the lighting can be dimmed manually using a separate potentiometer that does not affect presence detection control.

Positioning of detector

The positioning of the detector is crucial to the function! The illustration below shows how the detector should be positioned. Combined with Lens 51, which permits higher positioning, optimum detection during entry is achieved. And the detector does not look out through the door, which means the lighting is not activated when someone passes in the corridor outside. Positioning of the detector in the corner farthest away from the door means the detector can be mounted higher up, thus reducing the risk of damage. With this mounting the slightly downward-pointing fields reach down at a suitable height over by the door.

Regarding control of the light sources, with 50 Hz operation and non-dimmable HF devices one is referred to control on the power side, i.e. let the detectors control the contactors. This will cause increased wear to operating devices and light sources. To alleviate this, fittings with 50 Hz operation should be provided with electronic activators of the type Aura Light ‘Strike’ or similar.

To access the concealed savings potential available in all areas with daylight, the installation should be provided with activation/deactivation logic that prevents the light being activated upon entry. It is maybe not all activities that require extra light in addition to natural light, and personal need must govern when it is switched on. This means lighting is switched on and off in the normal way using an impulse push-button. Lighting is turned off by detector after set time (3 – 5 minutes) only when no one remembers to switch lights off.. Logic Module EX-11 is suitable for two lighting groups (e.g. main lighting and board lighting).

An optional potentiometer can be connected to the 1 – 10 V inputs in the main lighting fittings so that they can be dimmed manually, entirely independently of the rest of the system.

If more lighting groups are required, EX-13 is recommended; it has four channels, can also control fan systems and can be connected to a fire alarm. With a fire alarm the fans are switched off and the lighting is switched on.

Classrooms are not frequently used areas, as the operating times are relatively long, thus Dynamic Lighting control is not needed. However, a system with Logic Module EX-22 for constant lighting combined with logic for presence control can be used.

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