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Work
Time
Don't work
Integral action
Don't work
Ar
Ar
SV
PV
6-8 Other functions
Mask/Unmask bAL and Ar
1 To unmask
q Display the "dSP3" in the third block parameter and then subtract 128 from current value.
w Display the "dSP4" in the third block parameter and then subtract 1 from current value.
2 To mask
q Display the "dSP3" in the third block parameter and then add 128 to current value.
w Display the "dSP4" in the third block parameter and then add 1 to current value.
The parameters “bAL” and “Ar” are masked at defauit setting.
If necessary to appear these parameters, please refer to the following procedure.
1) Function
•“bAL” and “Ar” are functions to suppress overshoot.
(Usually it is not necessary to change the setting.)
2) If they aren't optimum value, sometime you don't get the good control. Usually it is not necessary to set
them.
3) "Ar"(Anti-reset wind-up) is automatically set by "Auto tuning".
1 bAL
MV is calculated by adding the offset (bAL) to MV’ ,the result of PID calculation, from PV and SV.
2 Ar
The integral range is SV±Ar.
Integral action don't work when PV is out of
the range.
bAL increase
bAL decrease
bAL
50%
100%
0%
Set value (SV)
Proportional band
Control output (MV)
MV' (PV)
PV
SV
PID
bAL
MV'
MV
+
+
Operation value
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