Planning And Application; Number Of Connectable Ballasts - ABB i-bus KNX Product Manual

®
ABB i-bus KNX
4 Planning and
application
4.1 Number of
connectable ballasts
© 2008 ABB STOTZ-KONTAKT GmbH

Planning and application

In this section you will find some tips and application examples for practical
use of the Light Controller.
Several electronic ballasts with a 1-10 V interface can be controlled by a
single output of the Light Controller. The number of dimmable ballasts per
output is limited both by the switching and the control powers of the Light
Controller.
Both sizes determine the maximum number of connectable 1-10 V ballasts.
The smaller number of ballasts limits the maximum number of ballasts which
can be connected to an output.
Example
The 1-10 V control current of the Light Controller allows up 50 ballasts on
the Light Controller output.
Only 25 ballasts are allowed due to the technical properties of the switch
relay in the Light Controller output and the inrush current of the ballasts.
Thus only 25 ballasts can be connected to the output of the Light
Controller.
In this case the number of ballasts can only be increased when the load
current of the ballast is not switched via the relay in the Light Controller,
but rather by an external contactor. Only the control current of the
contactor coils is switched via the relay of the Light Controller. In this case
the load capacity of the contactor contact and not the load capacity of the
relay in the Light Controller is required for the calculation of the maximum
number of ballasts.
Each output should be considered individually. A mutual influence between
the outputs must not to be considered.
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