ABB i-bus KNX Product Manual page 54


ABB i-bus KNX
Commissioning

time for dimming changeable via bus. The time received via the communication object Fade time
(DALI format) or (KNX format) has an effect on the ON/OFF switching performance. The format for the
flexible dimming time has to be determined in the parameter Object format of flexible time for dimming
(Fade time).
For further information see:
page 199
Note
The switch off time is also considered when the lighting group is at the lower dimming threshold and an
OFF telegram is received. In this case, the lighting group switches off at the lower dimming value limit
only after the programmed dimming time for switch ON/OFF. This ensures that all lighting groups switch
off simultaneously. Hierdurch ist sichergestellt, dass alle Leuchtengruppen gleichzeitig ausschalten.
Dimming speed, time for 0...100 %
(function relative dimming)
Options:
This dimming time only affects DIM telegrams, which are received for the DLR/A via the central
communication object Relative dimming for the DALI output.

time for dimming changeable via bus: The time received via the communication object Fade time
(DALI format) or (KNX format) has an effect on the dimming speed from 0...100%. The format for the
dimming time has to be determined in the parameter Object format of flexible time for dimming (Fade
time).
Note
The following should be taken into account when selecting any fade time: depending on the lighting
equipment involved, staged dimming can occur with fast dimming speeds and low dimming times.
The cause of this is that dimming steps are defined in the DALI standard in order to achieve a
logarithmic lighting curve, which appears as a linear response to the human eye.
With the central function, the defined dimming thresholds (minimal/maximum brightness value) in
parameter window
individual group. If the minimum dim value is less than the possible physical dim value of the DALI
equipment, this device is automatically set to the lowest possible physical dim value (background
brightness).
During the activated burn-in function the lamps are switched on with 100 % brightness independently of
the central DIM telegrams and set brightness values.
52 2CDC507128D0202 | DLR/A 4.8.1.1
Communication object No.
0.7 s
...
5.7 s
...
90.5 s
time for dimming changeable via bus
Parameter window Gx
8, page 125, and Table of fading times Fade time (No.
Group, page 63, continue to apply as thresholds for the
8),