The numerical filtering function configurable for every input channel is a low pass first order.
The mathematic formula used is:
Meas_n =  K * Meas_n-1 + (1- K) * Val_n
With: K is the filter efficiency,
Meas_n is the filtered measure at time n,
Meas_n-1 is the filtered measure at time n-1,
Val_n is the actual input value measured at time n.
The sample time (from time n-1 to time n) is about 10ms.

Filter efficiency	Filter Level	Corresponding  K value
No filtering	0	0
Smooth filtering	1 2	0,750 0,875
Average filtering	3 4	0,937 0,969
High filtering	5 6	0,984 0,992

Gepubliceerd voor:Schneider Electric Belgium