ABB i-bus KNX Product Manual page 176

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ABB i-bus KNX
Planning and application
Performing artificial lighting calibration (for lighting group 1...4)
Artificial lighting calibration must be performed for each 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 room should be darkened. The lighting intensity in the detection range of the light sensor must be less
than 20 lx. Interference of the artificial lighting calibration caused by daylight has the effect that the light
controller assumes that the illumination can produce a larger brightness level than is actually the case. The
light controller will set a lower level of brightness in control operation.
The light sensor is ideally vertically positioned above the monitored working surfaces. If it is not possible to
darken the room, the artificial lighting calibration should be performed early in the morning or in the
evening. The artificial lighting should be set with all the lighting groups involved in lighting control (master
and slaves) using a Lux meter on the reference surface to measure the setpoint brightness, e.g. 500 lx.
Proceed as follows for the best results:
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Deactivating light control
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Switch the artificial lighting fully on
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Wait until the Lux meter on the reference surface indicates a stable value

Set the setpoint brightness
If this brightness value has been set constant, the relevant lighting controller group must first be enabled to
store the setpoint. To do so, first select the lighting controller group (1...4) via communication object (Nr.
27) Enable controller calibration (1byte). The communication objects Calibration artifical light and
Calibration daylight will then be ready to receive. This is a safety measure to ensure that calibration cannot
be triggered accidentally during normal operation, so as not to overwrite the values set. The
communication objects remain ready to receive for one hour or until calibration is triggered (telegram with
value 1).
The artificial lighting calibration is triggered by a telegram to the communication object Calibration lighting.
At the start of the artificial lighting calibration the object Activate fct controller/status of the lighting group is
automatically set to 1 by the DALI Light Controller. Now the calibration can be started immediately.
The DALI Light Controller saves the current brightness value as a setpoint for light control. As a
confirmation, the DALI Light Controller switches the lighting group to be controlled on at 100% brightness.
Thereafter the lighting curve is followed through right down to the minimum value and stored in the DALI
Light Controller. This calibration takes about a minute, but can take up to 90 seconds if the brightness
values fluctuate. The lighting group to be controlled can be switched on thereafter. The lighting control is
started at the same time.
This concludes the artificial lighting calibration.
174 2CDC507128D0202 | DLR/A 4.8.1.1