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

The fittings can have conventional 50 Hz operating devices with non-dimmable or dimmable HF operating devices. In the latter case the lighting can be dimmed manually using a separate potentiometer that does not affect the presence control. Classrooms are not considered to be frequently used areas, as the operating times are relatively long, thus Dynamic Lighting is not needed.

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.

Control system

In a classroom the lighting is presence-controlled in four groups using the EX-13 logic module. The lighting can be switched on manually (recommended) or automatically. The four lighting groups are, for example, blackboard lighting, half of ceiling light fittings that provide standard down-lighting, half that provide uniform general lighting, and lighting in the group work corner. When presence ceases the lighting is automatically switched off after the set period (3 – 5 minutes). With the main light fittings a potentiometer is connected to the 1 – 10 V inputs so they can be dimmed manually, independently of the rest of the system.

The concealed savings potential

With the EX-13 logic module you can access the concealed savings potential in that the lighting is not switched on automatically when you enter the premises. If the natural light is sufficient the lighting will not be switched on. The required lighting group is switched on using push-buttons as necessary.

Ventilation control

EX-13 also controls the classroom’s ventilation using a separate output with adjustable operational delay (0 – 1 hrs) so the ventilation does not start in the event of brief use of the premises. The ventilation output also has an adjustable switch-off delay (0 – 2 hrs) that starts when the presence ceases to ensure proper outgoing ventilation. The ventilation can also be started manually using a push-button, but cannot be switched off manually.

Fire alarms

Fire alarms or burglar alarms can be connected to the function input on the EX-13. In the event of fire or burglary, maximum lighting is switched on and the ventilation is switched off.

See EX-13 manual for connection and programming.

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