Behaviour With Bus Voltage Failure, Recovery And Download - ABB SA/S 12.16.6.1 Product Manual

®
ABB i-bus KNX
4.4 Behaviour with bus
voltage failure,
recovery and
download
Planning and application
Reaction on bus voltage failure
The reaction of each individual output at bus voltage failure can be
parameterized in parameter window A: General with the parameter Reaction
on bus voltage failure. This parameterization acts directly on the relay and
has the highest priority in the Switch Actuator.
For further information see:
page 154
Before the first switching action is possible after bus voltage recovery, the
SA/S will first store enough energy in order to ensure that enough energy is
available to immediately bring all relays safely and immediately to the
required (parameterised) position with a renewed bus voltage failure.
With the parameterization Contact unchanged, the relay contact at bus
voltage failure is not changed, 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 with 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 is only available,
depending on the SA/S type, after about 10...30 seconds to switch all
contacts simultaneously, see
transmission and switching delay after recovery of bus voltage set in the
parameter window General, 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 first contact when sufficient
energy is stored in the SA/S, in order to ensure that enough energy is
available to immediately bring all outputs safely to the required switch state
with a renewed bus voltage failure.
The Switch Actuator independently commences to operate after about 1 to 2
seconds, independently of the parameterised transmission and switching
delay.
This means, the communication objects are set according to the
programming, e.g. the timer for time delay is started. A switching action or a
transmission of telegrams is only possible after the transmission and switch
delay times have timed out.
The threshold, scene and preset values set via KNX are still available after
bus voltage recovery, should the corresponding parameters for overwriting
download be set to no.
With parameterization set to yes, the values set via the bus are overwritten
with the values from the ETS.
Function chart, page 139 and
Technical data, page 7. Depending on the set
SA/S | 2CDC 505 056 D0207 159
Function chart,