8-1
Chapter 8. PID CONTROL TUNING
CAUTION
This unit incorporates the self-tuning function without use of control constant settings
in addition to the ON/OFF control and conventional PID control. This self-tuning control
monitors and studies the characteristics of the control subject even if the SP value is changed
or external disturbance occurs in order to automatically calculate the control constants. This
ensures stable control all the time.
With the control method [CtrL] of the parameter setting, select a desired PID control tuning suitable for the
required controllability or application.
0: ON/OFF control
The control is operated with the SP and differential settings ([dIFF]). The PID constants are not used.
1: Fixed PID
The control is operated with the fixed PID constants set by AT (auto tuning) or key operation.
2: ST (Self-tuning)
The PID constants are set automatically if the SP is changed or an external disturbance occurs.
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