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To complete the adjustment for the constant light controller, a further step is required during
which the characteristic of the connected lamp is automatically measured in dependence of the
output value of the controller.
To be able to carry out the brightness calibration, the device must have been already
programmed in such a way that aside from the "Start brightness calibration" object, also the
output object(s) is/are connected with the corresponding actuators. Also the actuators should be
programmed in such a way that the values received are set immediately, to ensure that the
calibration process runs properly.
Here too, as in item (b), the room is to be darkened, to minimise the effect of changing daylight
conditions during the measurement. If this is not possible, the adjustment should be carried out
in the dark or at night. To obtain excellent results, the lamps should be turned on prior to the
calibration. The calibration can start when the measured brightness is constant, i.e. the heat-up
of the lamps has been completed.
The process of calibration now proceeds as follows:
1. Brightness calibration is started by sending a "1" to the Brightness calibration object (in the
constant light application under extended parameters).
2. The lamps are switched on at 100%. Then comes a waiting period of 60 seconds for the
lamps to warm up and reach their full brightness. Then the brightness is checked to see how
much it has changed since the last measurement. If the change drops below a certain
percentage in comparison to the measured value, it is assumed that the brightness is stable
and the actual calibration can begin. Otherwise a new measurement is carried out after a
certain time to again determine the percentage of change. This process is repeated until a
stable brightness value has been reached. However, only up to a maximum of ten times.
3. Then the output values are reduced separately into steps of 10% and the corresponding
brightness is determined for each value; and here, too, a waiting period is necessary until
the brightness values have become stable:
–
A1: 100%
–
A1: 100%
–
A1: 90%
–
...
–
A1: 0%
4. After completion of the measurement the output characteristics are calculated and stored in
the device. Then a successful measurement is confirmed in form of a "1" on the Start
brightness calibration object.
5. If the calibration cannot be completed within a period of 6 minutes due to unfavourable light
conditions (extremely fluctuating brightness values), the measurement is interrupted and a
"0" is sent via the "Start brightness calibration" object.
Note
The calibration can be terminated by sending a "0" via the "Start brightness
calibration" object. The calibration is similar if only one output is used, but only
with the A1 output values.
KNX Technical Manual 2CKA001473B8667 │ 06.02.2017
A2: 100%
A2: 90%
A2: 90%
...
A2: 0%
Commissioning
│59
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