ABB i-bus KNX Product Manual page 178

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ABB i-bus KNX
Planning and application
Undertaking daylight calibration automatically
Daylight calibration must be performed for each lighting group, where the additional function Light control
is enabled. Lighting control is only possible for lighting groups 1...4.
Implementation using ETS is described in the following.
Important
The sequence of daylight and artificial lighting calibration is not random. Calibration with artificial light
must be performed before calibration with daylight.
The daylight calibration can be undertaken automatically by the DALI Light Controller or experimentally by
the user. The required setting can be found in
parameter Compensation factor for daylight calibration automatically. Automatic calibration is preferred.
For automatic daylight calibration, the artificial lighting must be switched off and the light control
deactivated. The same brightness level (setpoint) as artificial lighting can generally be created using
shading units. In order to prevent with a high level of certainty that the setpoint is not undershot in the
controlled state, a brightness can be set for the daylight brightness, which is about 10 % above the
brightness value of artificial brightness calibration.
Using communication object Enable controller calibration (No. 27), the readiness to receive the
communication object Calibration daylight (No. 29) must be undertaken. The calibration can be undertaken
by a telegram with value 1 sent to the communication object Calibration daylight. The DALI Light Controller
undertakes the calibration and determines the levels (weighting) of artificial lighting and daylight. After this
calibration, the DALI Light Controller switches the setpoint and commences with lighting control.
If a shading device is not available for use or the daylight is not sufficient to set the desired brightness, a
manual daylight calibration cannot be undertaken.
176 2CDC507128D0202 | DLR/A 4.8.1.1
Parameter window - Gx Light controller, page 95 with the