Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 599

Process control function blocks

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■Fine tuning after auto tuning

After auto tuning is completed, the change of process variable (PV) in relation to the setting value (SV) is observed on the

tuning setting execution window of the PX Developer monitor tool. The optimal values are obtained by adjusting the P, I, and

The response of the process variable (PV) corresponding to the change of the setting value (SV) is observed.

• Response is quick, but oscillatory.

Fine tuning when the response is quick, but oscillatory

• Proportional gain: Reduce (Proportional effect is reduced.)

• Integral time: Increase (Integral effect is reduced.)

• Optimal value

• Response is slow

Fine tuning when the response is slow

• Proportional gain: Increase (Proportional effect is increased.)

• Integral time: Reduce (Integral effect is increased.)

When the derivative action is applied, the derivative time is adjusted with the stability and rapid response check. (Increasing

the derivative time increases the derivative effect, and reducing the derivative time reduces the derivative effect.)

Appendix 3 Related Functions of Process