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6-33

IM 05P02C41-01EN

Monitoring and Control of Regular Operations

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

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