ABB i-bus KNX Product Manual page 56

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ABB i-bus KNX
Commissioning
Note
Saving the last brightness value is undertaken with every OFF telegram except for the lighting groups
already switched off. In this case, with a further OFF telegram, the OFF state is not saved as the last
brightness value.
If a renewed switch OFF telegram is received during dimming down, the current brightness value is
saved as the last brightness value.
If the gateway operating voltage fails, the last brightness value is lost, and after recovery of the gateway
operating voltage maximum brightness is set. The last brightness value is retained after a download or
KNX voltage failure.
A differentiation is made between the last brightness value with central switching via the communication
object Switch (DALI output) and group-orientated switching via communication object Switch (Group x).
Both values are independent of each other. This means if some lighting groups are dimmed or switched
on or off via a central telegram, the last brightness values for the lighting group are retained without
change. When an ON telegram is received for the lighting group, the brightness value, which was set
with the last OFF telegram, is set again with the lighting group.
Minimum brightness value
Options:
This parameter defines the minimum brightness value, which the lamps of the lighting group assume. This
value is stored in the DALI devices and thus applies for all functions. If a minimum brightness value is set,
which exceeds the maximum brightness value, the minimum brightness value is set equal to the maximum
brightness value.
If the function Burn in lamps is activated, the lamp group will be operated only with 0 % (OFF) or 100 %
brightness, regardless of this setting.
If a brightness value is received via the communication objects Brightness value and Brightness va-
lue/status or Brightness value of slave, which are below the defined minimum dimming value, the minimum
dimming value is set.
The Minimal brightness value also applies in the functions Staircase light, Scene and Sequence.
Important
The maximum and minimum dimming values selected for the lighting group are also valid with a central
telegram via the communication objects of the DALI output.
Example: Lighting group 1 is parameterized with a minimum dimming value of 20 %; lighting group 2 is
parameterized with 10 %. If the DGN/S receives a central telegram in this constellation: set the bright-
ness value to 5 %; lighting group 1 is set to 20 %, and lighting group 2 is set to 10 %.
54 2CDC 507 114 D0201 | DGN/S 1.16.1
100 % (255)
...
1 % (3)