Follow-Up Time Of The Inactive Light Control - ABB i-bus KNX Product Manual

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ABB i-bus KNX
Planning and application
4.9.4

Follow-up time of the inactive light control

This function is particularly useful, when there is a presence detector in the room.
Example
The user has deactivated the light control and set the maximum level of brightness. The user leaves the
room, and the presence detector switches off the light. If the user returns after a short time (within the
adjustable follow-up time), the lighting is automatically set again to the maximum brightness value and
the light control remains active. The temporary setpoint set by the user, e.g. by dimming, remains
active.
A more detailed explanation can be found under the parameter Follow-up time of the inactive control in
s [0...65,535] in
4.9.5 Commissioning/calibration of the constant lighting control
Commissioning of the constant lighting control should be undertaken when the intended furnishings are in
place. The technical lighting attributes of the room are influenced by the furniture and the floor coverings,
e.g. reflection and absorption. This on the other hand has a direct effect on the brightness value, which is
detected by the light sensor.
If constant lighting control is set in a room that does not yet have its final configuration and changes are
then made to the layout in the room, this will have a direct effect on the lighting control. In the simplest
case, this can lead to larger setpoint overshoots or undershoots. In extreme cases, it can lead to unstable
oscillating control.
With a calibration of the constant lighting control, all lamps controlled directly (master) or indirectly (slave)
by the DALI Light Controller are to be included in the calibration.
Important
The sequence of daylight and artificial lighting calibration is not random. Calibration with artificial light
must be performed before calibration with daylight.
Before the calibration process it is recommended that the function of the Light Sensors is checked. Using
the bit combination of the communication object Status sensors (No. 9), you can display whether
brightness is detected on the sensor input. If this is not the case, the sensor cable may have the poles
reversed, be open circuit or the room may be in absolute darkness. After verifying the function of the light
sensor, which is of relevance for the light controller, the required light control should be deactivated. This
can be undertaken, e.g. by a telegram with the value 0 to the communication object Activate function
controller. The light can now be dimmed independently of the parameterization of the light controller, the
light and any brightness can be set and calibration of the constant lighting control can commence.
Parameter window - Gx Control Operating, page 103.
DLR/A 4.8.1.1 | 2CDC507128D0202 173