This application shows a corridor between two wings of a hospital building. The corridor has large windows and very good natural lighting. It is very busy at certain times of the day, i.e. a lot of people pass through. A dynamic, daylight-dependent lighting system has therefore been installed. This means that the lighting automatically adapts to the available natural light and traffic through the corridor. When presence is detected, the lighting is gradually increased from the base level of around one per cent to a level that is determined by the amount of natural light entering the corridor.

Light sources

In this application, light fittings are used with dimmable HF ballasts and 1-10 V control.

Location

For optimum detection and comfort it is important that the detector is installed in the correct location, and this is especially important in corridors and aisles. Unfortunately detectors are all too often installed so that they point at doors and entrances, with the result that detection efficiency is considerably reduced. Often the best solution is to install the detector on the ceiling, as shown in this example.

A PD-2200 detector with number 17 lens is installed “horizontally” on the ceiling at an angle of 45° to the vertical. See diagram on right. One detector is able to cover corridors or aisles up to 50 m long. In corridors up to 100 m in length, two detectors are used, installed at either end so they face each other. Additional detectors must be used in corridors that are longer than this.
Note that if pendant light fittings are used, the detector must be mounted at the same level or below the light fittings.

Individual fields in the lens system can be masked off so that the detection field does not cover an area that is to be ignored, such as an intersection between corridors. It is recommended that practical trials are carried out before the final configuration is decided!

See also application 2B with wall-mounted detectors!

Control system

The dynamic system uses light fittings with dimmable HF ballasts, presence detection, level selection and a light sensor.
Dynamic lighting control operates as follows:
When presence is detected, the lighting is switched to a level of up to 80 per cent, depending on the amount of natural light. One minute after presence was last detected, the lighting is decreased to around one per cent. When someone enters the corridor, the lighting is gradually increased again to a level (between one and 80 per cent) that is determined by the amount of natural light entering the corridor, as measured by the light sensor. If no presence is detected for one hour the lighting is switched off completely.

The main benefits obtained with dynamic control are:

• Uniform base lighting without the need for extra light fittings that are switched on all the time.
• Potential to save 20 – 99 per cent on operating costs.
• Lower working temperature for light fittings, and hence longer life.
• Light sources are switched on and off less often and run at lower power, so there is less wear to fluorescent coatings, and light sources last longer.
• No need to comply with light source manufacturer’s recommended burn times, which greatly reduces running times and increases savings.

Take a close look at the application and the wiring diagram on the left, especially if you are considering replacing a lighting system or installing a new one.

The detectors can be installed using the simplest possible cable, e.g. EKKX 1 x 4 x 0.25 mm2. For information on adjusting the IR detectors, refer to the handbook or the manual supplied with the detectors. Correct adjustment is much easier if a BL-1 field indication diode (order no. 13035) is used. This is especially true in long corridors and aisles.

Optional manual dimming of lighting can be achieved by connecting a momentary, normally open pushbutton switch to terminals 6 and 7, see wiring diagram. See also the manual for NV-3TR, which describes wiring alternatives that enables dimming from zero to 100 per cent.

Information on current budger

The yellow area represents the energy consumption when lighting is controlled according to the light source manufacturer’s recommendations.
The green area represents the energy consumption with a lighting control system installed.