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ABB i-bus
EIB / KNX
3.5
Reaction on voltage
failure and recovery
3.6
Reaction after
programming
© 2004 ABB STOTZ-KONTAKT GmbH
Application and planning
Reaction on bus voltage failure
It is possible to parameterise the behaviour of the outputs on failure of the
bus voltage. The function of the Room Controller is retained provided that
the supply voltage (115 / 230 V AC or 12 V DC auxiliary voltage) is available.
If it has been set in the parameters, the Room Controller can thus continue
to keep the functions in the room maintained.
In the "Heating actuator" operating mode, any neutral position of the valve
can be triggered. In the "Fan coil control" operating mode, the master and
slave outputs are switched off (high-resistance). Fan speed 0 is thus
triggered.
Example:
Conventional push buttons are connected to a Room Controller
via binary input modules. The Room Controller controls the
lighting in the room. On bus voltage failure, the lighting can still
be operated because the Room Controller is not supplied by the
bus.
Reaction on bus voltage recovery
The behaviour of the outputs can be parameterised. In the master "Fan coil
control" function, the outputs remain switched off until a new control value is
received.
Reaction on supply voltage failure
The supply voltage has failed if both the 115/230 V AC supply and the 12 V
DC auxiliary supply have failed. The Room Controller has no function in this
case.
For the Switch Actuator Module SA/M 2.6.1, the status of the relay outputs
can be parameterised so that a defined state can be established. The setting
is carried out in the parameter "Reaction on bus voltage failure".
In the "Heating actuator" operating mode, it can be set whether the valve
should be fully open or closed during the supply voltage failure. In the "Fan
coil control" operating mode, the master and slave outputs are opened. Fan
speed 0 is thus triggered.
For the Electronic Switch Actuator Modules ES/M 2.230.1 and ES/M 2.24.1,
the outputs always switch off during the supply voltage failure (high-
resistance).
Note:
The preset and scene values that have been changed by the
user are lost on failure of the supply voltage. They are
overwritten by the parameterised default values.
Reaction on supply voltage recovery
The behaviour of the outputs is identical to the behaviour on recovery of the
bus voltage. It can be parameterised for each output (except for fan coil
control).
After programming, the device behaves in the same way as after bus voltage
recovery (parameterisable).
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