ABB i-bus KNX Product Manual page 180

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ABB i-bus KNX
Planning and application
Performing artificial light calibration (for lighting group 1...8)
Artificial light calibration must be performed for each group where the additional function Light control is
enabled. Light control is only possible for lighting groups 1...8.
Implementation using ETS is described in the following.
Important
The sequence of daylight and artificial light 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 light calibration caused by daylight has the effect that the DALI light
controller assumes that the illumination can produce a greater 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 positioned vertically above the working surface to be monitored. If it is not
possible to darken the room, the artificial light calibration should be performed early in the morning or in
the evening. The artificial light should be set with all the lighting groups involved in light control (masters
and slaves) using a luxmeter 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
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Set the setpoint brightness
When this brightness value has set itself as a constant, the relevant light controller group for storing the
setpoint must be enabled. First of all, the selection of the light controller group (1...8) must be made using
communication object (no. 27) Enable controller calibration (1 byte). The communication objects
Calibration artificial light and Calibration daylight are then ready to receive. This is a security feature to
ensure that a calibration is not triggered unintentionally during normal operation, unintentionally overwriting
the set values. The communication objects are ready to receive for an hour or until the calibration is
triggered (telegram with value 1).
The artificial light calibration is triggered by a telegram to the communication object Calibration artificial
light. At the start of the artificial light calibration, the communication object Fct Activate 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, follow the lighting curve 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 after this. The light control is started at the
same time.
This concludes the artificial lighting calibration.
178 2CDC 507 100 D0202 | DLR/S 8.16.1M