Properties Of The 1-10 V Interface - ABB i-bus KNX Product Manual

®
ABB i-bus KNX
1.2 Properties of the
1-10 V interface
© 2008 ABB STOTZ-KONTAKT GmbH
General
Dimmable ballasts with 1-10 V control interface have long been established
on the market and offer a simple, reliable and attractively priced solution for
implementing controlled lighting environments, mood illumination and energy
saving lighting installations.
Properties of the 1-10 V lighting systems
•
Control of the ballasts is implemented via an interference resistant
DC voltage signal of 10 V where:
1. 10 V = maximum brightness (open control line) and,
2. 1 V = minimum brightness (control line fully loaded).
•
The 10 V DC control voltage is supplied from the ballasts.
The maximum supply current is dependent on the ballast type and
manufacturer and lies typically between 0.5 mA and 4 mA per ballast.
•
The control voltage is potentially isolated from the mains supply voltage,
however it is not classified as SELV (Safety Extra-Low Voltage).
•
Ballast devices connected to different phases can be dimmed with
the same control voltage, i.e., control line.
Due to the typical characteristics of the 1-10 V system, the following points
must be observed:
•
The polarity of the control lines and of the control voltage must be
observed.
•
The control voltage is potentially isolated from the mains supply voltage,
however as the voltage is not SELV, in the event of a fault, mains
voltages can be present.
•
The control voltage can be limited to a maximum or minimum value via
the control device, e.g., the Switch/Dimm Actuators SD/S. This allows
the implementation of two useful features:
1. Setting a minimum value allows trouble-free ignition of lamps at
low light levels.
2. Limiting the upper value can save significant energy in normal
operation and can extend the useful service life of the fluorescent
tubes or allow for future compensation due to ageing of the
luminaries.
•
Testing the correct function of a ballast can be easily done without the
need for additional software or testing devices:
1. The ballast is turned on with an open circuit contol line.
The luminary should ignite at full intensity.
2. Short-circuiting the control line, e.g., with a wire jumper (observe
second point!). The lamp should now dimm down to the minimum
brightness.
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