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ABB i-bus
KNX
Planning and application
166 2CDC 505 056 D0208 | SA/S
4.4
Reaction on bus voltage failure, recovery and download
Reaction on bus voltage failure
Response in the event of bus voltage failure is specified by the parameter
Reaction on bus voltage failure
in parameter window A:
General.
This parameterization acts directly on the relay and has the highest
priority in the Switch Actuator.
For further information see:
Function diagram
, p. 147 and
Function diagram
, p. 161
Before the first switching action is possible after bus voltage recovery, the SA/S will first store enough
energy to ensure enough is available to immediately bring all relays safely to the required (parameterized)
contact position if there is another bus voltage failure.
If the setting is
Contact unchanged,
the relay contact position is also unchanged on bus voltage failure,
i.e. with the staircase lighting function operational, this light remains on until bus voltage recovery and until
a new switch action is received.
After the contact positions are set on bus voltage recovery, the Switch Actuator remains non-functional
until the bus voltage recovers.
Reaction on bus voltage recovery
The Switch Actuator draws the energy for switching the contact from the bus. After bus voltage is applied,
sufficient energy to switch all contacts simultaneously is only available, depending on SA/S type, after
about 10…30 seconds, see
Technical data
, from p. 9. Depending on the transmission and switching delay
after recovery of bus voltage as set in the
General
parameter window, the individual outputs will only
assume the contact positions that result from the function switching tree after this time. If a shorter time is
set, the SA/S will only switch a contact when sufficient energy is stored in the SA/S to immediately bring all
outputs safely to the required contact position if another bus voltage failure occurs.
The Switch Actuator starts operating again after about 1-2 seconds, regardless of the parameterized
transmission and switching delay. This means the communication objects are set according to the
programming, e.g. the timer for time delay is started. Switching or telegram transmission is only possible
after the transmission and switch delay times have elapsed.
The threshold, scene and preset values set via KNX are still available after bus voltage recovery if the
corresponding parameters for overwriting download are set to
no
. If parameterization is set to
yes
,
the values set via the bus are overwritten with the values from ETS.
Содержание i-bus SA/S 12.10.2.1
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