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5-3 bAL and Ar function
Note: The parameters bAL and Ar disappear at shipment.
you need to set to appear below,"Switching bAL and Ar to appear or to disappear.
1) These are functions to suppress overshoot.
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" is automatically calculated and set by "Auto tuning".
zz
zz
z bAL
This is added as offset to MV' that PID calculates from PV and SV.
This is MV after calculation above.
xx
xx
x Ar
The "Ar" limits the integral range. The integral
range is SV ± Ar.
Integral action don't work when PV is out of
the range of SV ± Ar.
Switching bAL and Ar to appear or to disappear
zz
zz
z Switch to appear
q Display the "dSP2" of the third block parameter and then subtract 128 from current value.
w Display the "dSP3" of the third block parameter and then subtract 1 from current value.
xx
xx
x Switch to disappear
q Display the "dSP2" of the third block parameter and then add 128 to current value.
w Display the "dSP3" of the third block parameter and then add 1 to current value.
Increase
Decrease
bAL
50%
100%
PV
SV
PID
bAL
MV'
MV
+
+
0%
SV
Proportional band
Control output (MV)
PV
Work
Ar
Ar
SV
PV
Don't work
Don't work
Integral action
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