172-65710M-04 (SC-F71 Parameters/Functions) 23 Dec 2021
283
Autotuning (AT) at Cascade control
During the Cascade control, four types of PID values can be calculated with the use
of Autotuning (AT) exclusively developed for the Cascade control.
Types of PID values
Types of PID values
Calculated values
Master side PID values of
Cascade control
Cascade_Proportional band (master-side),
Cascade_Integral time (master-side),
Cascade_Derivative time (master-side)
Slave side PID values of Cascade
control
Cascade_Proportional band (slave-side),
Cascade_Integral time (slave-side),
Cascade_Derivative time (slave-side)
PID values in Master single control
(PID values of Input 1)
Input 1_Proportional band, Input 1_Integral time,
Input 1_Derivative time
PID values in Slave single control
(PID values of Input 2)
Input 2_Proportional band, Input 2_Integral time,
Input 2_Derivative time
Cascade_AT mode
There are two types of Autotuning (AT) for the Cascade control; Easy adjustment
and Load factor adjustment.
Easy adjustment: Autotuning (AT) is executed once. Control reference level* is
not calculated.
Load factor adjustment: Autotuning (AT) is executed twice. Control reference
level* is calculated.
* Control reference level is the data used for PID value calculation for Cascade control.
In the case of TC input/RTD input, there is no need of calculating the Control
reference level and Autotuning (AT) in the Easy adjustment can be used.
In the case of Voltage/Current inputs, the Control reference level must be calculated
and Autotuning (AT) in the Load factor adjustment must be used.
PID values calculated by AT in different control modes
Control
Cascade AT mode
Types of PID values
Control
reference level
Master-side
Slave-side
Master-
side PID
values of
Cascade
control
Slave-
side PID
values of
Cascade
control
PID
values in
Master
single
control
PID
values in
Slave
single
control
Master-
side
Slave-
side
Cascade
control
Easy
adjustment
(AT once)
Easy
adjustment
(AT once)
Easy
adjustment
(AT once)
Load factor
adjustment
(AT twice)
Load factor
adjustment
(AT twice)
Easy
adjustment
(AT once)
Load factor
adjustment
(AT twice)
Load factor
adjustment
(AT twice)
Master
single
control
Easy
adjustment
(AT once)
Note
Load factor
adjustment
(AT twice)
Note
Slave
single
control
Note
Easy
adjustment
(AT once)
Note
Load factor
adjustment
(AT twice)
Note: Setting is ignored.
:
Calculated
:
Not calculated
Содержание SC-F71
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