ABB CL Series, Руководство по применению

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Function blocks
211
1SVC 440 795 M1100
Signal smoothing filter
The display system provides 32 signal smoothing filters FT01
to FT32. The function block enables you to smooth noisy
inputs.
Wiring a signal smoothing filter
You can integrate a signal smoothing filter into your circuit
as a coil.
Figure: 111: Display system circuit diagram with smoothing
function block
Parameter display and parameter set for the FT
function block:
h
Extreme changes in the manipulated variable can occur
when the manual manipulated variable is transferred or
deactivated.
h If the function block is running in UNI (unipolar) mode, a
negative signed manipulated variable value will be output
as the value zero.
M 48----------------------------Ä FT17EN
FT17 +
>I1
>TG
>KP
QV>
FT17 FT PT1 signal smoothing function block, number 17
+
Appears in the parameter display
>I1
Input value
>TG
Recovery time
>KP Proportional gain
QV>
Output value, smoothed
h The recovery time T
g
is the time in which the output value
is calculated.
The recovery time T
g
must be set so that it is an integer
multiple of the cycle time or controller scan time T
c
.