ABB i-bus KNX Product Manual page 72

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ABB i-bus KNX
Commissioning
Note
Saving of the last brightness value is undertaken with every OFF telegram, unless the lighting group is
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 there is a light controller operating voltage failure, the information of the last brightness value is
retained. With a renewed ON telegram after light controller operating voltage recovery, the brightness
value of the last OFF telegram is still set.
The last brightness value is lost after a download or KNX bus voltage failure. After KNX bus voltage
recovery, the last brightness value is set to maximum brightness.
A differentiation is made between the last brightness value with central switching via the communication
object Switch (DALI output) and group-oriented switching via the 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 value for the lighting group is 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.
Minimal dimming 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 dimming value, the minimum brightness value is set equal to the maximum
dimming value.
If the function Burn-in lamp is activated, the lighting 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, Brightness value/Status
or Brightness value of Slave, which are below the defined minimum dimming value, the minimum dimming
value is set.
The Minimum brightness value also applies in the Staircase lighting and Scenes functions.
70 2CDC 507 100 D0202 | DLR/S 8.16.1M
100 % (255)
99 % (252)
...
1 % (3)