Changing The Setpoint - ABB i-bus KNX Product Manual


ABB i-bus KNX
Planning and application
4.9.1

Changing the setpoint

Depending on the intended purpose of the room or area, e.g. training or competition areas in sports halls,
it may be useful to apply a changeable setpoint (control parameter) for the constant light control via the
KNX. The communication object Control parameter is provided for this purpose.
Commissioning with artificial light and daylight calibration is implemented initially using the brightness
(setpoint 1), which is most frequently used with normal operation. In so doing, the characteristic of the
lighting is recorded by the DALI Light Controller and stored to ensure optimum light control. For the second
brightness value (setpoint 2), the actual value must be determined again exclusively with artificial light.
Procedure
If this has not already taken place, the lighting group of the DALI Light Controller is first calibrated with
the brightness setpoint (1) used primarily during operation. A detailed procedure is described in the
Commissioning/calibration of the constant lighting
parameter) for setpoint 1 is read using the light controller section in the Software Tool. This value has to
be written to the communication object Control parameter when changing to setpoint 1. This can, for
example, be implemented with the assistance of a button or a visualization.
In order to determine the second setpoint brightness (2), the room must also be darkened and the
brightness is set exclusively using artificial light only. The Actual value (control parameter) for the
second setpoint setting is read again using the controller in the Software Tool. This value has to be
written to the communication object Control parameter when changing to setpoint 2. This can, for
example, be implemented with the assistance of a button or a visualization.
1.
2.
3.
4.
5.
6.
1)
Interference of the artificial light calibration caused by daylight has the effect that the DALI 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.
Determine the setpoint and set it via KNX (using the example of lighting group
Version
Deactivate lighting control.
Slaves must be actively
integrated into the control.
Darken the room.
Set the artificial lighting so
that the setpoint brightness
is set to the reference point.
Read control parameter.
Set control parameter for
setpoint via KNX.
control, page 177. The Actual value (control
By
Send 0 to communication object Function
Activate controller (no. 31).
Alternatively, this can occur with the
corresponding button in the Software
Tool.
Write the corresponding communication
objects Function Activate Slave with a 1.
Blind or time of day.
Dimming via communication object
Relative dimming (no. 34).
The control parameter (actual value) is to
be read via external Software Tool
Write the communication object Control
parameter (no. 41) with previously read
control parameter (actual value) using a
pushbutton or visualization, see point 6.
1
)
Effect
Lighting control is deactivated/stopped.
The entire lighting that should be
effective in the lighting control is
activated during calibration.
Brightness in the detection area of the
1)
light sensor less than 20 lx
Setpoint is set, e.g. 500 lx.
Lux meter is positioned vertically below
the light sensor.
In a perfectly controlled circuit, the
actual value is equal to the setpoint
and can be used as a control
parameter. The control difference is
equal to zero.
The control parameter for the new
setpoint is stored in the DALI Light
Controller for the controller lighting
group and used with lighting control.
DLR/S 8.16.1M | 2CDC 507 100 D0202 175
.