172-65710M-04 (SC-F71 Parameters/Functions) 23 Dec 2021
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8.3 Setting PID Values Automatically (Autotuning)
Autotuning (AT) automatically measures, computes and sets the optimum PID values.
Autotuning (AT) can be used for PID control (Direct action/Reverse action) and
Heating/Cooling PID control.
Refer to 8.14 Executing Cascade Control for Autotuning (AT) during the
Cascade control.
Description of function
Parameters computed by Input 1_Autotuning (AT)
Input 1_Proportional band [heat-side]
Input 1_Integral time [heat-side]
Input 1_Derivative time [heat-side]
Input 1_Proportional band [cool-side] (Only for Heating/Cooling PID control)
Input 1_Integral time [cool-side] (Only for Heating/Cooling PID control)
Input 1_Derivative time [cool-side] (Only for Heating/Cooling PID control)
Parameters computed by Input 2_Autotuning (AT)
Input 2_Proportional band
Input 2_Integral time
Input 2_Derivative time
AT bias
The AT bias is used to prevent overshoot during Autotuning in the application which
does not allow overshoot even during Autotuning. The Autotuning method uses
ON/OFF control at the set value to compute the PID values. However, if overshoot is
a concern during Autotuning, the desired AT bias should be set to lower the set point
during Autotuning so that overshoot is prevented.
[Example] When AT bias is set to the minus (
) side.
AT remaining time monitor
Displays the remaining time until Autotuning (AT) is completed.
(Display range: 0 hours 00 minutes to 48 hours 00 minutes)
The SV display shows “TCAL” from the start of Autotuning (AT) till the display of the
remaining time. Once the remaining time is displayed, the time is reduced every minute.
Time
Measured value (PV)
AT bias
Set value (SV)
AT point
Summary of Contents for SC-F71
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Page 18: ...172 65710M 04 SC F71 Parameters Functions 23 Dec 2021 17 Differential temperature control ...
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Page 293: ...172 65710M 04 SC F71 Parameters Functions 23 Dec 2021 292 Checking PID values ...
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