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IM 05P02C41-01EN
Control Functions
8.8 PerformingNon-linearPIDControl
Description
If a deviation (E) is smaller than the non-linear control gap width (GW), it is computed as
a proportional added the non-lenear control gain (GG).
Proportional Band (CPB) = Proportional Band (P) / GG
*|E|≤GW/2
However, CPB is limited by 0.1 to 999.9%.
SP=EU(50%
EU(100%)
PV
PV
OUT
GW
Control output will change smoothly (i.e., without any bumps) when CPB switches.
Note
In heating/cooling control, do not use non-linear PID control.
SettingDetails
Parameter
symbol
Name
Display
level
Settingrange Menusymbol
GW Non-linear control gap width PRO
OFF, 0.0%+1digit to 50.0%
of PV input range span
(EUS)
TUNE
GG Non-linear control gain PRO 0.001 to 1.000
Note1: In Cascade control, the LP2 lamp is lit while the Loop-2 parameter is displayed.
8
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