Gira KNX 2139 00 Product Documentation page 82

Valve outputs | Cyclical command value monitoring / emergency
operation
The configured valve direction of action (deenergised closed / deenergised
opened) is taken into account in the electrical activation of the outputs by
emergency operation. With deenergised closed valves, the switch-on time is
derived directly from the configured PWM and the cycle time. In the case of
deenergised opened valves, the switch-on time is inverted.
The actuator possesses a summer / winter switchover. Depending on the season,
this allows the setting of different command value setpoints for a valve output for
emergency operation Summer/winter switch-over for valve outputs. It is also possible
to switch over the operating mode during active emergency operation. In this case,
the value belonging to the operating mode is activated immediately after the
switchover.
If no summer / winter switchover is planned in the actuator, then only a command
value can be configured in the ETS for emergency operation.
If command value monitoring is enabled, then the actuator will check the arrival of
telegrams on the command value object during a settable time period. The time
period is defined separately for each valve output by the "Monitoring cycle" para-
meter. The time set there should be at least double the time for the cyclical transmis-
sion of the command value of the controller, in order to ensure that at least one tele-
gram is received within the monitoring time. Cyclical command value monitoring
takes place continuously. The actuator retriggers the monitoring time automatically
on each command value telegram received and after a device reset. If there are no
command value telegrams during the monitoring time, then the actuator will activate
emergency operation.
If the bus control of a valve output was disabled during permanent manual op-
eration, then no command value monitoring is performed for the affected out-
put. This exits active emergency operation. When bus control is enabled by a
permanent manual operation, the actuator restarts the monitoring time and
checks for incoming command value telegrams.
According to the priority control, active command value monitoring can be overridden
by other device functions with a higher priority (e.g. service mode, manual operation).
At the end of a higher priority function, the actuator executes emergency operation
for the valve outputs concerned once again, if it is still activated by missing command
value telegrams.
Optionally, the command value of emergency operation can also be activated after
bus voltage return or after an ETS programming operation. This is only the recall of
the configured command value and not the activation of emergency operation, as
takes place during command value monitoring.
The command value preset by active emergency operation is also included in
the determination of heat requirement. In addition, the command value of
emergency operation has an influence on the pump control.
At the end of emergency operation (new input command value received), the beha-
viour of a valve output is permanently defined. If no function with a higher priority is
active, the actuator always tracks the state for the affected valve outputs most re-
cently preset by normal bus operation (activation by command value telegrams).
Heating actuator 6-gang with controller | Order no. 2139 00 | 21393100 Page 82 of 257