EIB Alarm Central Unit, surface-
mounted
75730010
Technical
Documentation
© Gebr.Berker 2005
Version: 18.08.2005
Page: 58 / 81
(Subject to prior change)
75730010.doc
Part 9
11.2
Bus voltage recovery
The alarm central unit will initialize itself after bus voltage recovery. In this connection, the alarm central unit will cre-
ate a defined object state by setting all EIB output objects (alarm indicators, alarm outputs, objects for triggering the
alarm transmission device, etc.) to values which correspond to the system state as set after a bus voltage failure. The
"bus voltage recovery" event will be entered into the event log.
What system state will be set depends on the "bus voltage recovery" parameter in the "alarm central unit" parameter
branch.
•
The "all AAs disarmed" setting will disarm all arming areas after initialization. In this connection, it may be possible
that the system will change into the "fault" state after bus voltage recovery if, for example, sabotage contacts are
open, detectors are missing or 'global' faults are signalled in individual safeguarding areas
(refer to "5.3 Fault ac-
knowledgement operations", page 48).
•
After initialization, the "last state" setting will bring the system into the state which was active before the bus voltage
failure or will activate the subsequent state logically following the state before the bus voltage failure. The following
states can be set:
State before bus voltage failure
becoming
State after bus voltage recovery
"disarmed"
"disarmed" *, **
"armed"
"armed" ****
"pre-alarm"
"armed" ***, ***
"alarm"
"alarm" ***
"disarmed after alarm"
"disarmed" *
,
**
"fault"
"disarmed" *
,
**
"detector test"
"disarmed" *
,
**
*:
The system will change into the "fault" state, if necessary, if 'global' faults (e. g. opened sabotage contact, mains
failure > 30 seconds, etc.) or area-referred faults (e. g. open sabotage detector) have occurred after bus voltage
recovery. Thus, a battery fault which had occurred before bus voltage failure will reappear after bus voltage re-
covery, unless such battery fault has not been reset yet (no battery change made).
**:
Blocking elements triggered by the pulse signals of the alarm central unit will not go open automatically after bus
voltage recovery as no pulse disarming signals will be produced in such case.
***: If detectors have raised an alarm prior to bus voltage failure such detectors can again raise subsequent alarm
after initialization. Even detectors which are open during the initialization phase will raise alarm.
****: The system will not immediately change into the "disarmed" state after disarming. The display units of the areas
concerned will read the "alarm" message which points out that there was a bus voltage failure in the "armed"
state (the "disarmed after alarm" object and the alarm indicators will not be triggered in this connection). You can
actuate the "more…" key to call these messages into the display units and acknowledge them. In this connec-
tion, the "bus voltage recovery" event will be displayed. Then you can only go to the "disarmed" state if you ac-
tuate an arming device of the area concerned. As an alternative, you can use the alarm reset option to go to the
"disarmed" state without acknowledging the message in the display units.
The area will then be ready for arming.
Detectors which are open or active during the initialization phase (depending on their parameterization) will raise
an alarm in the "armed" state after bus voltage recovery.
Important:
The system will always be in the "disarmed" state after having been programmed from the ETS.
