ABB i-bus KNX Product Manual page 80


ABB i-bus KNX
Commissioning
Note
Behavior between ballast power on and absent DALI voltage (interface failure/system failure)
According to the DALI standard, no exact priority has been defined between these two functions. The
behavior depends of when the ballast is again ready to receive and the ballast detects that DALI voltage
is not present. Both depend on the electronics and firmware of the ballast.
In most cases, the following behavior is expected:
After the ballast operating voltage is applied, the power-on level is started by the ballast. However, a
few 100 ms later the ballast will detect that there is no DALI voltage applied. This on the other hand will
trigger the system fault Level (no DALI voltage). In this way, the user will only visually detect the system
fault (the parameterized behavior of the DALI voltage failure).
Note
The minimum and maximum dimming values (dimming thresholds) still remain valid.
The functions Scene, Staircase lighting, Blocking, Forced operation as well as dimming processes are
interrupted. The states of the timer functions after a download or after KNX bus voltage recovery are to
be set separately in the respective parameter windows of the timer function.
The operating voltage applied to DALI equipment, e.g. ballasts, is a prerequisite for correct behavior of
the DALI equipment.
Reaction on download, KNX bus or
light controller voltage recovery
Options:
This parameter determines how the DALI device of the lighting group reacts after a download or at KNX
bus voltage recovery or after light controller supply voltage recovery.

no change: The brightness of the lighting group does not change. DALI devices, which are switched
off, remain off.

Status before failure: The lighting group is brought to the state which it had before the voltage failure.
The brightness value must be set for at least two seconds before KNX bus voltage failure or a
download in order to ensure that it is set again after KNX bus voltage recovery.

max. brightness value (100 %): The lighting group is switched on or dimmed with the maximum
brightness value.

min. brightness value (1 %): The lighting group is switched on or dimmed with the minimum brightness
value.

OFF (0 %): The lighting group is switched off.
78 2CDC507128D0202 | DLR/A 4.8.1.1
no change
Status before failure
max. brightness value (100 %)
min. brightness value (1 %)
OFF (0 %)