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6-8 Other functions
The parameters "bAL" and "Ar" are masked at default 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.
MV'
PV
PID
SV
2
Ar
The integral range is SV±Ar.
Integral action don't work when PV is out of the range.
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.
Operation value
+
MV
+
bAL
Set value (SV)
Proportional band
PV
Ar
SV
Ar
– 27 –
Control output (MV)
100%
bAL increase
50%
bAL
bAL decrease
0%
Integral action
Don't work
Work
Don't work
MV' (PV)
Time
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