ABB i-bus KNX Product Manual page 83

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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
Interaction between ballast power on and DALI voltage recovery (interface failure):
The power-on level of the DALI device (ballast) is set first of all after DALI device (ballast) supply
voltage recovery. The brightness value is stored in the DALI device (ballast) and is set independently by
the DALI device (ballast) directly after the ballast supply voltage recovery.
Simultaneously, the DLR/A on the DALI will once again receive responses from the DALI device
(ballast). As a result, the DLR/A informs the re-detected DALI device (ballast) again about the lighting
group information. After to this procedure, the lamps are controlled with the parameterized brightness
level at DALI bus voltage recovery.
If the power-on brightness is to be retained, the option no change has to be set for the parameter
Reaction on DALI bus voltage recovery or DALI voltage recovery.
DLR/A 4.8.1.1 | 2CDC507128D0202 81