Output smoothing filter

The macro offers the possibility for all control modes to adjust an “smoothing filter” for the outputs "HumidControl" and "DehumCtrlSig".


To smooth the control outputs, we  use an exponential moving average filter.

After download or power failure the output signal will be initialized with its actual value.


The filtered value will be updated with the update rate defined with the parameter SYS-02.


The new output value will be calculated according to the formula:

New HumidControl = previous cycle value HumidControl  + 2/(1 + SYS-01)*(actual internal control signal - previous cycle value HumidControl)


When the internal control signal is "0", we will use the value to "0,5" instead of SYS-01, to stop the humidification and de-humidification faster.


The next pictures shows an example of the filtered output signal.



Note: To disable the output smoothing filter, set the value of SYS-01 to “0”


Description

Default value

SYS-01: smoothing filter number of samples

20

SYS-02: smoothing filter sample period

5 s