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11.5.6
General parameters — Setpoint brightness (lux)
Options:
–
Here the desired brightness of the room is to be set. Below this threshold - hysteresis the
presence detector starts the control and starts to adjust the light until the setpoint has been
reached again. The presence detector will not switch off but regulate against the bottom
control limit. A switch-off takes place only when the limit = 0 or the switch-off delay has
expired.
Note
For a well-functioning constant light controller it is absolutely essential to
calibrate the brightness sensors. The calibration is carried out via the brightness
detection parameter. Here it is to be noted that the presence detector does not
measure the brightness of the luxmeter on the working area (table), but the
reflected brightness, which can, depending on the reflecting area, can be lower.
Procedure:
–
–
–
Example:
The brightness at the top of the desk is to be 500 lux. The presence detector, however,
measures the required brightness at the position it is mounted( e.g. on the ceiling it only
measures 20 lux). This means that there is a difference between the brightness of light at the
desk and the ceiling. If the object is now used for brightness adjustment, one can (after
calibration of the brightness sensor) enter 500 lux here.
11.5.7
General parameters — Hysteresis (%)
Options:
–
Switching threshold = setpoint ± hysteresis
The hysteresis prevents excessive switching when the current ambient brightness is close to
the brightness threshold.
11.5.8
General parameters — Switch-off delay (hh:mm:ss)
Options:
–
The switch-off delay is the time period between the last movement detected and the sending
of the telegram "Value for switch-off". If movement is detected again within this period, the
switch-off delay is reset to the setpoint.
KNX Technical Manual 2CKA001473B8667 │ 06.02.2017
Description of application and parameters
1 .. 400 .. 1000
Switch of the artificial light/"shield out" the daylight
Send the value measured with the luxmeter through the object
Similar procedure for daylight
10 .. 12 .. 100
00:00:10 .. 00:05:00 .. 18:12:15
"Constant light controller" application
│97
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