ABB i-bus KNX Product Manual page 129

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ABB i-bus KNX
© 2008 ABB STOTZ-KONTAKT GmbH
Planning and application
Manual implementation of daylight calibration
If a daylight calibration is not possible, for example, because the setpoint is
not reached with the available daylight or a shading option is not available to
darken the detection range of the Light Sensor so that the setpoint can be
set, manual daylight calibration can be undertaken.
First of all set in the parameter window
Compensation factor for daylight calibration automatically to no.
Subsequently a factor between 0 and 99 can be entered.
This factor defines the relationship between daylight and artificial lighting.
A larger value compensates more for daylight. A smaller value on the other
hand gives a higher weighting to artificial lighting. After the factor has been
transferred for download in the Light Controller using the brightness
measured in the detection range of the Light Controller by the Luxmeter.
More artificial lighting is required if the desired setpoint is undershot. This is
achieved by increasing the factor. Too much artificial lighting is available if
the desired setpoint is exceeded. The artificial lighting share must be
reduced. This is implemented by reducing the factor. This is repeated until
the light control controls the required brightness.
As an example in the following, short operating instructions for output A are
listed for manual daylight calibration:
The calibration should be performed preferably at two measurement points,
e.g. at a setpoint of 500 lx, the light control should be performed in daylight
from about 200 lx and 400 lx.
the parameter
X: Control
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