ABB i-bus KNX Product Manual page 63

®
ABB i-bus KNX
© 2008 ABB STOTZ-KONTAKT GmbH
Commissioning
Control circuit principle schematic
Setpoint
value
+
Actual value =
Sensor value
Recorded
brightness value
Explanations of terms
Sensor value
Actual value
Light Controller
LR/S x.16.1
Light Sensor
LF/U 2.1
+
Absorption and
reflection attributes of
the room
Brightness value
Daylight share
This value corresponds with the physically measured value
on the sensor input, which results from the room
brightness detected by the Light Sensor LF/ 2.1
(luminance of the area monitored by the sensor).
The sensor value does not comply with the lighting
intensity (Lux value) in the room. In order to directly detect
the brightness changes in the detection range of the Light
Sensor, the measured value can be read out via the
Sensor value object.
The actual value of the control circuit is the fed back of
the control path. If the controlling channel is only assigned
to a Light Sensor, the actual value complies to the sensor
value.
If several Light Sensors are allocated to a channel, the
actual value is determined from the sensor values. In the
parameter window Light sensor
the smallest, the largest or the average sensor values are
used for Light control calculations.
For further information see:
1-10 V control value
Brightness value
Artificial light share
+
you can parameterise if
Constant lighting control
61