Setting Pid Control Mode (Alg) - YOKOGAWA UT Advanced UT32A User Manual

8.3 Setting PID Control Mode (ALG)
Description
IM 05P01D31-01EN
There are two PID control modes: standard PID control mode and fixed-point control
mode.
Select a PID control computation formula shown in the following table according to the
control mode or operation mode.
Standard PID control PV derivative type
mode (output bump at SP change)
Fixed-point control PV derivative type
mode (output bumpless at SP change)
PV Derivative Type PID
This is a PID control method in which the derivative action works only on the PV.
It can also eliminate output bump due to SP changing operation in Local mode.
The following shows the PV derivative type PID control computation formula.

= 100 1 ∫

e + e
OUT
P Ti

where OUT: control output, e: deviation (PV-SP), P: proportional band, Ti: integral time,
Td: derivative time, and ∆PV: PVn-PVn-1 (n-1: value before one control period)
PV Derivative Type PID (output bump at SP change)
SP
PV
PV Derivative Type PID (output bumpless at SP change)
SP
Operation mode
AUTO+Local
Deviation derivative type
PV derivative type
(output bump at SP change)

d

dt + Td ΔPV
• •
dt

OUT
PV OUT
AUTO+Remote
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