
Functional description
© 2006 ABB STOTZ-KONTAKT GmbH
66
ABB i-bus
®
EIB / KNX
4.3
Monitoring of lamps and
ballasts
With the DALI-Gateway, it is possible to monitor the DALI devices of a
channel together (in broadcast). With the DALI-Gateway, it is possible to
distinguish between a lamp and a ballast fault. A fault is detected directly
and displayed on the gateway by the yellow LED. The information is
simultaneously made available via the EIB / KNX through a channel-related
communication object and can be sent to a control unit or visualisation
program for display purposes. From there, the necessary repair measures or
corresponding maintenance cycles can be initiated. The current status of the
lighting installation in the building is always available or can be retrieved on
request. It is thus possible to integrate the lighting in a higher-order Facility
Management system.
Failure of an individual device can be determined at any time via an
address-related query by two telegrams which are sent successively. This
can realised with a visualisation or external logic.
Equipment with a DALI interface can send a DALI telegram which displays a
lamp fault. This information is queried by the DALI-Gateway. The
corresponding data sheets of the device manufacturer state whether the
DALI equipment in use reports a lamp fault.
With the DALI-Gateway DG/S 1.1, it is possible to detect lamp
faults per channel. Detection of the individual defective device
is possible by reading the addressing object (Select Device)
and the actual status object.
Note: You can assume that in general all DALI ballasts support the reporting
of a lamp fault. DALI dimmers and DALI switch actuators often do not have
this feature.
In order to guarantee correct operation, the gateway has to know how many
ballasts are to be monitored. This is carried out by activating the object
“Detect Ballasts”. With this function, the DALI-Gateway establishes
automatically how many ballasts are connected and uses this number as a
reference value. If the installation should be extended or reduced, the option
“Detect Ballasts” must be activated again. This process is only necessary if
the number of ballasts per channel has changed and not when replacing a
ballast in the same channel. Manual detection of the ballasts is also possible
by pressing the test button on the device for longer than 5 seconds.
The duration of the ballast detection is dependent on the number of
connected DALI devices and can take approx. 90 seconds with the
maximum number of devices.