9
Fig. 3: Control parameters of constant light switch for two light rows
Fig. 4: Influences of the constant light controller
Note: Also the hysteresis must be taken into account. However, this is not displayed for reasons of simplicity.
Here the special parameter settings for 2 light rows must be observed.
- Constant light controller
In contrast to the constant light switch, there is the possibility of switching in several stages. Both the constant light controller and the constant light switch ensure
that the level of brightness in the room does not drop below the desired level. However, the brightness controller is additionally able to send telegrams for dim-
ming lamps to the KNX bus. This enables a constant level to be attained due to the dimming of lights brighter and darker, always in dependence of the natural
light in the room. And the accuracy of the control increases with the operating time. The constant light controller remembers the luminosity of the lamps used,
it measures this continuously (see also chapter 7.2.6, 'Information on calibrating the internal light controller). That is why the lights used later must also be used
during commissioning of the presence detector with the constant light controller function. The artificial light component relative to daylight is also determined
during commissioning. Next to the brightness the constant light controller also responds to the presence of persons in the room. This function can also be
operated with 2 light rows.
B
A
C
1
3
2
Lux
#1
#2
#2
#1
12:00
t
Ix
1
2
3
4
12:00
A
: Artificial light curve of light row 1
B
: Artificial light curve of light row 2
C
: Sunlight curve
Control parameters:
1
: Setpoint (lx)
2
: Delay time after switch-on up to measurement of the artificial light component
3
: Minimum time above the switch-off threshold (minutes)
1
: Natuaral light
2
: Brightness in the room
3
: Programmed brightness-value threshold
4
: Artificial light
Product description
