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ABB i-bus
KNX
Planning and application
4.3
Reaction on ...
4.3.1
Bus voltage recovery
General
•
On bus voltage recovery, the group object values can be parametrized; if not they are set to the
value 0.
•
Timers are out of operation and should be restarted.
•
Status group objects are sent as long as the option On change is set.
•
The contact position is not known with 100% certainty after bus voltage recovery. It is assumed that
the contact position has not changed during the bus failure (i.e. that there were no manual
operations). Receipt of a new Switch event is required in order to establish the contact position of the
Blind/Roller Shutter Actuator.
•
The sending delay is only active on bus voltage recovery!
Switch contact output
•
The Staircase lighting time group object value remains the same as before bus voltage failure.
•
The Disable function Time group object value is dependent on the selected option.
•
The Permanent ON group object value remains the same as before bus voltage failure.
•
The switch contact output switches as follows:
Note
If a staircase lighting time was active at bus voltage failure, it will restart.
Note
The values of group objects Logical connection 1/2 are stored on bus voltage failure. The values are set
again after bus voltage recovery
If values are not assigned for these group objects Logical Connection 1/2 they will be deactivated.
On reset via the bus, the values of group objects Logical Connection 1/2 remain unchanged.
Based on the value set for the Switch group object value on bus voltage recovery.
o
If the Object value "Switch" on bus voltage recovery parameter is not parametrized,
o
the reaction on bus voltage failure is decisive.
If neither of the two above options is selected, the last position before bus voltage failure is
o
retained.
JRA/S 6.230.3.1 | 2CDC506083D0201 135
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