ABB i-bus KNX Product Manual page 98


ABB i-bus KNX
Commissioning
Actual control value (input) only for
more than one light sensor
Options:
If the lighting group is assigned with several light sensors, the actual value for the constant lighting control
is determined with this parameter. The lowest, the largest or the average value of the detected sensor
values can be used for lighting control. If only a single Light Sensor is assigned to an output, the current
sensor value is used as the actual value irrespective of the setting.

lower sensor value: The DLR/A uses the lowest sensor value of the assigned light sensors as its
actual value for constant lighting control. All light sensors are considered that are assigned to the
output (control circuit). With this setting, the room is lit up most brightly by constant lighting control.
The setpoint should not be undershot in normal, malfunction free operation, e.g. no reflections or no
direct incidence of light on the light sensor.

average sensor value: The DLR/A uses the linear average value of the assigned light sensors as its
actual value for constant lighting control.

upper sensor value: The DLR/A uses the highest sensor value of the assigned light sensors as its
actual value for constant lighting control. This setting ensures that constant lighting control requires
the least possible level of artificial lighting. This achieves the largest possible conservation of energy.
However, the brightness at many locations in the room is very likely below the target brightness level.
Upper control limit during
active lighting control
Options:
This parameter defines the maximum brightness value, which the lighting group of the DLR/A can use
during light control.
The control limits are independent of the dim and value limits that are parameterized in
Gx Group, page 63.
Lower control limit during
lighting control
Options:
This parameter defines the minimum brightness value, which the lighting group of the light controller, can
use during light control.
96 2CDC507128D0202 | DLR/A 4.8.1.1
lower sensor value
average sensor value
upper sensor value
100 % (255)
99 % (252)
...
51 % (130)
50 % (128)
50 % (128)
49 % (125)
...
20 % (51)
...
1 % (3)
0.3 % (1)
Parameter window