Page 193 - Advanced Course

KNX ADVANCED COURSE

Used devices

Brightness controller UP255 25 S1 Brightness control 909601
Push button 4-gang delta profile 12 S4 On/Off/Dim/Blnd/Displ241301
Dimming actuator like in the basic project

Commissioning

Save your work
Download the devices and test

7.3 General hints for the calibration of lighting closed loop control

1) Start ETS
2) Open the required dim actuators, configure their parameters, create the groups
and link them, finally download to the actuator
3) Configure the brightness controller as well: depending on your preference with a
fixed setpoint (parameter) or a variable one by object.
4) Don’t forget to link the object “calibration” to a group address!
5) Now adjustment at 50% operating point follows: Prerequisite: External light level in
the room >= 50% of setpoint.
6) To achieve that, switch on the lights and close the shutters
7) Now place a precision luxmeter underneath the sensor
8) Then adjust the measured luxvalue at the sensor that it shows approx. 50% of the
setpoint. Example: >= 250 lx at setpoint of 500 lx. Best results are made when
direct value control (8 bit) is used to set the required dimming value instead of 4-bit
dimming.
9) It must be ensured that daylight level is constant enough
10) When the luxmeter now shows the correct setpoint, simply send a telegram to let it
calibrate. (this can be achieved either by ETS, or a test push button)
11) The controller should respond with the parameterised setpoint. Now the control is
calibrated and can be used.
12) If there is no controller feedback, then the reason can be: value out of range,
caused by too bright or too dark surface, too much side light

Home and Building Management Systems KNX Association
Lighting Control Lighting Control_E0310a.doc 34/34