ABB i-bus KNX Product Manual page 98

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ABB i-bus KNX
Commissioning
Brightness on ballast voltage recovery
(DALI Power-On Level)
Options:
This parameter determines the reaction of a ballast, or all the ballasts in a group, on ballast supply voltage
recovery. A storage location is provided in the ballast for this purpose. The brightness value (DALI Power-
On Level) that the ballast uses to switch on the lamp when the ballast supply voltage recovers is stored in
this location.
The brightness value of the ballast is factory set at the maximum brightness (100%). This has the
advantage that without any DALI programming or commissioning requirement, the ballast is switched on
and off normally via its ballast supply voltage. This can be especially helpful during the commissioning
phase. If no DALI commissioning has been undertaken, the lighting can be switched on and off via the
ballast supply voltage using a normal circuit-breaker.
In "normal" operation, this reaction may not be desirable: If there is a ballast supply voltage failure and
recovery, all the ballasts switch on at maximum brightness. This can lead to increased inrush currents and,
in the worst case, can cause a circuit-breaker to trip. Moreover, the entire building is fully illuminated and
must be switched off manually.
So that users can override the factory-set behavior when switching on after the ballast supply voltage
recovers, this parameter can be used to set any brightness value between 0% (OFF) and 100% (maximum
brightness). It can also be set to restore the last brightness before the voltage failure.
•
Current KNX value: The DALI device (ballast) is switched on using the last (previous) set brightness
value used before ballast voltage failure. This function must be supported by the DALI devices. Since
the end of 2009, this property has been defined in the standard for DALI devices. Please contact the
ballast manufacturer in case of doubt. The DALI gateway writes the "MASK" command to the ballast
for the DALI Power-On Level.
Important
This parameter changes the factory setting of the ballast.
96 2CDC507164D0201 | DG/S x.64.1.1
Current KNX value
100% (255)
99% (252)
...
1% (3)
0% (OFF)