Standby switch-off

When using the standby switch-off, a KNX switch actuator must be linked to the status object of the same name (1 bit) of the gateway. For this purpose, an output of the switch actuator in the function as a normally open contact must be connected to the status object of the gateway. The output of the switching actuator switches the mains voltage supply of all the DALI operating devices of the DALI system in concern.

If all DALI operating devices of the DALI system concerned were switched off during the running time, the object value of the standby switch-off subsequently switches to "OFF". In this case, the telegram to the actuator disconnects all DALI operating devices (but not the gateway!) from the mains, thus saving electrical energy. Switching off the mains voltage can be delayed after transmitting the last DALI command to switch off the groups or single devices by the "Switch-off delay" parameter. This delay is useful, for example, if the DALI system is to be prevented from being switched off prematurely in the event of frequent changes to the state of the brightness values. Only when the brightness state has been 0% for a while can the operating devices also be disconnected from the mains.
The mains voltage is switched on automatically by the "ON" status telegram of the standby switch-off as soon as the gateway is to switch on at least one operating device by means of a DALI command. The time between the transmission of this status (switching on the mains voltage) and the transmission of the DALI command can be delayed by the parameter "Delay DALI restart" (0...10 s). This gives the DALI operating devices sufficient time after the return of the mains voltage to initialise themselves in order to be able to react properly to the commands of the gateway.

If, during the course of a delay, additional telegrams are received via KNX until the restart of the DALI devices, then only the most recently received telegram is forwarded to the DALI system after the delay time has elapsed.

When using the delay until the restart of the DALI devices, ensure that the parameter "Behaviour after bus voltage return" (corresponds to the DALI power-on level) of a group or single device is configured as "Switch-off". This means that the affected devices do not switch on directly when the mains voltage returns but only after they have received an appropriate DALI command from the gateway via the DALI cable.

During a standby switch-off, the gateway does not evaluate any DALI error status of the projected operating devices.

Observe the current carrying capacity of the KNX switching actuator integrated in the standby switch-off! If necessary, use additional installation contactors. We do not recommend using multiple actuator channels, because it is usually not possible to implement simultaneous switching of all the channels.

The status object of the standby switch-off always works with active transmission as soon as the status changes. The state is transmitted to the KNX after the bus/mains voltage returns or after an ETS programming operation if a device is switched on or off after resetting it. Optionally, the status of the standby switch-off can also be transmitted cyclically in addition to transmission when the object value changes. The "Cyclical transmission" parameter defines whether cyclical transmission is enabled or not. If enabled, the "Cycle time" parameter on the same parameter page defines the time for cyclical transmission.