YOKOGAWA UP35A - Page 81

6-20
IM 05P02D41-01EN
Manual PID Tuning Procedure
(1) In principle, auto-tuning must be used.
(2) TunePIDparametersintheorderofP,I,andD.Adjustanumericslowlyby
observing the result, and keep notes of what the progress is.
(3) Gradually reduce P from a larger value. When the PV value begins to oscillate, stop
tuning and increase the value somewhat.
(4) Also gradually reduce I from a larger value. When the PV value begins to oscillate (with
long period), stop tuning and increase the value somewhat.
(5) Gradually increase D from a smaller value. When the PV value begins to oscillate (with
short period), stop tuning and lower the value slightly.
ReferenceValuesforManualTuningofTemperature,Pressure,andFlowRate
Settingrange
(reference)
Initialvaluefortuning(reference)
Pressure
P 100 to 300% 200%
I 5 to 30 s 15 s
D OFF OFF
Flow rate
P 100 to 240% 150%
I 8 to 30 s 20 s
D OFF OFF
Temperature
(electric
furnace)
P 1 to 20% 5%
I 180 to 600 s 240 s
D 1/4 to 1/6 of I 60 s
6.3AdjustingPIDManually