Of An Operating Power Failure/Recovery; Of A Dali Power Failure; Behaviour Of The Dali Devices In The Event Of An Operating Power Failure/Recovery - ABB i-bus DALI-Gateway DG/S 8.1 Product Manual

ABB i-bus ® KNX
1.2.2 Behaviour of the DALI
devices in the event
of an operating power
failure/recovery
1.2.3 Behaviour of the DALI
devices in the event

of a DALI power failure

6
Introduction
A DALI power source (16 V DC) supplies the individual DALI devices,
the DALI processor, controller, control devices or modules which are
responsible for managing the scenes and groups in the DALI line.
A separate relay or a calculation of the switching capacity is not required
as the switching relay is integrated in the DALI ballast.
There are DALI devices (e.g. LED DALI converter, DALI switch actuators)
which consist internally of several DALI devices and can only be addressed
via a common DALI control cable. The internal DALI devices have different
individual DALI addresses and can be addressed individually via DALI.
These devices can be connected to the DALI-Gateway DG/S 8.1.
The internal DALI devices are detected and monitored. They
cannot however be triggered individually. The control is carried out
globally.
The following behaviour is defined in the supplied state of the DALI devices:
when the operating voltage of the DALI devices is interrupted, the connec-
ted luminaire fails. On mains voltage recovery, the luminaire is switched on
again with 100% brightness. The electrical installer can thus switch the DALI
lighting on and off e.g. with an automatic circuit-breaker, even if the individual
DALI devices have not yet been addressed.
This behaviour of the connected DALI equipment on failure and
recovery of the operating voltage can be parameterised with the
DALI Gateway. See chapter "Voltage failure" or "Voltage recovery".
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 since the luminary is no
longer supplied with operating voltage.
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.
The 8-fold KNX DALI gateway, DG/S 8.1, interprets a failure of the operat-
ing voltage of the DALI devices as a fault of the electronic ballast, since the
DALI device does not reply anymore. Once the operating voltage is restored,
the electronic ballast is switched on with maximal brightness (100%) as it is
requested by the manufacturer. After 1 or 2 seconds, the "recovered" elec-
tronic ballast(s) will be set to the brightness that is currently set for the corre-
sponding channel. They are controlled cyclically by the 8-fold DALI gateway.
An explicit parameterisation in the DALI gateway is not provided.
In the delivery status, the operating units with a DALI interface usually
switch over to the emergency mode and activate the connected luminaries
with maximal brightness in the event of a DALI power failure (e.g. due to a
rupture, a short-circuit of the control line or a defective DALI power source).
This value can be parameterised by the DALI gateway DG/S 8.1.