Description Of The Inputs And Outputs; Special Operation States - ABB i-bus KNX Product Manual

®
ABB i-bus KNX
2.4 Description of the inputs
and outputs
2.5

Special operation states

© 2008 ABB STOTZ-KONTAKT GmbH
Device technology
The switching outputs of the Light Controller are potentially isolated
(floating).
Different phases of the 230 V operating voltage can be connected to
neighbouring outputs.
Control and load ends are electrically isolated from the KNX.
When connecting the control line it is important to consider that the control
outputs each feature a common reference ground with one another.
The sensor inputs are electrically isolated from the KNX. When connecting
the control line it is important to consider that the control outputs each
feature a common reference ground with one another.
Caution
The connection of a 230 V mains voltage supply to one of the 1-10 V
outputs or sensor inputs will cause the destruction of the 1-10 V end stage
or the corresponding sensor input.
The behaviour with bus voltage failure and recovery can be parameterised.
The exact response after a download and bus reset is described in detail in
chapter Planning and application.
An open 1-10 V control line switches on the maximum ballast brightness.
A short circuited control line generates the minimum dimming value.
The minimum dimming value is also set if the control cable polarity is
reversed. In all three cases – open circuit, short circuit and incorrect
polarity – dimming of the lighting is not possible.
An open Light Sensor cable which results in maximum cable resistance
means the same as a dark room for the Light Controller. The 1-10 V output
is controlled with maximum brightness during light control.
The same behaviour is also exhibited with a short circuit and if the sensor
cable polarity is reversed. The sensor value can be read via the object
Sensor value, No. 32, 57, 82 or 107 of the corresponding output. This value
corresponds with the physically measured value on the sensor input and not
the Lux value in the room. In all three fault scenarios – open circuit, short
circuit and incorrect polarity – the value read via the object Sensor value is
equal to 0.
This value corresponds with the value of absolute darkness.
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