3.8Determining PID Constants (AT, ST, manual setup)
E5GN
3–13
3.8 Determining PID Constants (AT, ST, manual setup)
Ă• When you execute autoĆtuning, the optimum PID constants for the set
point during program execution are automatically set by forcibly changĆ
ing the manipulated variable to calculate the characteristics (called the
limit cycle method") of the control target.
Ă• To execute AT (autoĆtuning), specify : AT execute", and to cancel AT
(autoĆtuning), specify : AT cancel".
Ă• AT (autoĆtuning) cannot be executed during ON/OFF control.
Ă• The result of AT (autoĆtuning) is mirrored in the proportional band
(P)", integral time (I)" and derivative time (D)" parameters in the
adjustment level".
Adjustment level
Proportional band
Integrated time
Derivative time
AT (autoĆtuning) is started when the AT execute/cancel" parameter is set
to ON". During execution of AT, the No.1 display for the AT execute/canĆ
cel" parameter blinks. When AT ends, the AT execute/cancel" parameter
turns OFF, and the No.1 display stops blinking.
AT execute/cancel No.1 display
During AT execution
If you move to the operation level" during AT execution, the No.2 display
blinks to indicate that AT is being executed.
PV/SP No.2 display
During AT execution
Only the communications writing", run/stop" and AT execution/canĆ
cel" parameters can be changed during AT execution. Other parameters
cannot be changed.
JAT (auto-tuning)
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