Differing Light Strips - ABB i-bus KNX Product Manual

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ABB i-bus KNX
4.6.1

Differing light strips

© 2008 ABB STOTZ-KONTAKT GmbH
Planning and application
With this characteristic correction a second light strip (slave) can be
controlled with a brightness difference to the master lighting strip. This is a
way to set the rear lighting strip in the room to an amount x brighter than the
lighting strip which is located near the windows. In this way energy can be
saved in rooms with sufficient daylight.
If you wish to use this behaviour in a constant lighting control,
the characteristic correction has to be determined in a slave output.
The master output should be the brighter lighting strip which is further
away from the window.
The following the example is based on a room as schematically represented
in the following illustration. The lighting strip (1) furthest away from the
window should always be controlled by the value 20 (8 %) brighter than the
lighting strip (2) beside the window. A constant lighting control should still be
implemented in the room. The brightness is detected with a Light Sensor (3).
Light Sensor (3)
Strip 1
master
Schematic representation of an office area
The Light Sensor is located in the rear third of the room and when possible
should be installed under the workstation being monitored but should not be
subject to or affected by a direct source of light or reflections.
Case 1: The master is the brighter lighting strip
Strip 1 is connected to output A of the Light Controller and is parameterised
as a master. Strip 2 is controlled via output B of the Light Controller and is
parameterised as a slave with the following characteristic correction (darker
minus 20 digits):
In the parameter window
4 and entered for the above mentioned offset of the following values:
X0 = 1/Y0= 1, X1 = 20/Y 1 = 1, X2 = 254/Y2 = 235, X3 = 255/Y3 = 255
Strip 2
slave
the Number of value pairs is set to
X: Charact. adj.
Window
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