ABB i-bus KNX Product Manual page 84


ABB i-bus KNX
Commissioning
Note
Reaction 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 has applied, the power-on level is started by the ballast. However, a
few hundred ms later, the ballast will detect that there is no DALI voltage applied. This on the other
hand will trigger the system error Level (no DALI voltage). In this way, the user will only visually detect
the system error (the parameterized reaction on a DALI voltage failure).
Note
The minimum and maximum dimming values (dimming thresholds) still remain valid.
The Scene, Staircase lighting, Block and Forced operation functions as well as dimming processes are
interrupted. The state of the time functions after a download or after KNX bus voltage recovery is to be
set separately in the appropriate parameter window of the time function.
The operating voltage applied to DALI equipment, e.g. ballasts, is a prerequisite for correct behavior of
the DALI equipment.
Reaction on download or
KNX 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.

Last value before failure: The lighting group is brought to the state which it had before the failure. The
brightness value must have been set for at least two seconds before a 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.
82 2CDC 507 100 D0202 | DLR/S 8.16.1M
No change
Last value before failure
Max. brightness value (100 %)
Min. brightness value (1 %)
OFF (0 %)