Presence detector
Presence detectors detect heat motions and trigger a configurable circuit when motion is detected. In this way, a presence detector can increase security and energy efficiency in a building.
When selecting the "Presence detector" sensor type, you can choose between two sensor functions:
- with brightness sensor
- without brightness sensor
The ETS provides the corresponding parameters and communication objects dynamically for the function according to the parameterised function.
Most presence detectors have an integrated brightness sensor. This allows you to select whether brightness-dependent switching or brightness-independent switching should take place.
If the presence detector has a brightness sensor, the measured brightness value can be sent to the bus for further evaluation. You can choose to send the brightness value cyclically or when the brightness value changes. The corresponding threshold value or the cycle time can be configured.
The following functions are available on the parameter page of the sensor channel:
- Switching
- Brightness value transmitter
- Scene extension unit
The ETS provides the corresponding parameters and communication objects dynamically for the function according to the parameterised function
An optional disabling function can be activated for the presence detector.
Presence detector without brightness sensor
If the presence detector does not have a brightness sensor, it therefore works without analysing the ambient brightness. Only the start and end of a detection is detected and actions are triggered. Switch-on and switch-off brightness cannot be set.
The application here is an area where there is no daylight but only switched artificial light, e.g. in cellars.
The run-on time can be used to set the time from the last detection of a movement to the end of detection, e.g. when the lighting is switched off.
Optionally, the switching, dimming or scene command can also be deactivated at the beginning or end of the detection. For example, the lighting in a room has to be switched on or off manually.
Presence detector with brightness sensor
The function can also be activated independently of brightness for presence detectors with brightness sensors. This eliminates the parameters for brightness-dependent switching. However, the brightness value is still sent to the bus for further processing.
Three parameters are displayed during brightness-dependent operation:
- Switch-on brightness: The switch-on brightness defines the upper limit value at which the lighting is still switched on when motion is detected. If the ambient brightness rises above the entered value, the lighting is not switched on when motion is detected.
- Switch-off brightness (hysteresis): The switch-off brightness is a relative brightness threshold value that must be added to the switch-on brightness. Above this threshold, the lighting is also switched off when motion is detected.
- Run-on time after switch-off brightness: When the ambient brightness increases, artificial light is no longer required and can be switched off. However, a run-on time that can be parameterised here is waited until the switch-off command is issued.
The above diagram (Brightness-dependent presence detection) shows an example of how the three parameters are to be applied. Below the switch-on brightness, the lighting switches on when motion is detected. The light only switches off again when no more movement is detected and the run-on time has elapsed.
If the brightness in the room increases so that the switch-on brightness plus the switch-off brightness is exceeded, the lighting is switched off after the "run-on time after switch-off brightness" has elapsed, even if motion is detected.
