52
ABB i-bus
®
KNX
Project design and programming
Any scene sequences that have been started and the dynamic operating
mode (e.g. staircase lighting function) continue to run if “no change” has
been selected on the
General
parameter in the event of bus voltage failure.
The DALI faults, ballast and lamp faults are also detected without
KNX bus voltage. The corresponding fault telegram cannot be sent if the
KNX bus voltage is not present. This means that a DALI fault in the KNX
environment is not detected during an KNX bus voltage failure and the fault
information is lost. If a faulty lamp is replaced during an KNX bus voltage
failure, the telegram “Fault Lamp” with the value “0” (no fault) can likewise
not be sent and is lost.
DALI voltage failure
A failure in the DALI voltage (e.g. short circuit) of a channel is indicated by
the yellow DALI fault LED which lights up if the operating voltage is applied.
Communication with the connected DALI devices of the channel is not
possible without DALI voltage.
The behaviour of the DALI Gateway and the connected DALI devices must
be parameterised on failure of the DALI voltage.
The parameter “Reaction on DALI or EIB / KNX bus voltage failure” is availa-
ble in the
General
parameter window. The following options are available for
the DALI outputs: no change, turn on value, maximum and minimum dim-
ming value or Off.
The communication object “Channel X - Telegr. Fault DALI” can be activated
in the
Status
parameter window. Depending on the parameterisation,
the disruption in the DALI voltage of the channel is automatically routed
via this object or via a read request.
If required, an acknowledgement of the fault signal can be parameterised.
The general communication object “Fault Acknowledgement” is available
which enables both the reset of the 230 VAC fault signal and the ballast,
lamp and DALI fault signals of the individual channels.
The burn-in time function remains active and is continued after voltage
recovery for the remaining period.
Operating voltage failure at the DALI operating unit
If the operating voltage of a DALI device (e.g. electronic ballast) fails, the
device is no longer able to work. The light goes out.
In the delivery status, the operating units with a DALI interface usually set
the luminaries to maximal brightness (100%) when the operating voltage is
applied for the first time or when it is restored. This “Power UP Level” is pre-
defined by the manufacturer of the electronic ballast. As a result, the electri-
cian can switch the DALI illumination on or off, e.g. with an automatic circuit
breaker, even if the individual DALI devices have not been addressed yet.