172-65710M-04 (SC-F71 Parameters/Functions) 23 Dec 2021
209
When the Output change rate limiter is used, you may not be able to obtain
appropriate PID constants by Autotuning (AT).
Refer to 8.5 Setting PID Values Manually for the manual setting of PID values.
Requirements for Autotuning (AT) start
Start Autotuning (AT) when all following conditions are satisfied:
To start Autotuning (AT), go to Operation transfer mode.
Operation state
RUN/STOP transfer
RUN
Auto/Manual transfer
Auto mode
Remote/Local transfer
Local mode
Autotuning (AT) setting
PID control (State before starting AT)
Parameter
setting
Input 1_PID control and
Temperature control
operation [MC-(V)COS]
Input 1_Output limiter high [heat-side]
0%
Input 1_Output limiter low [heat-side]
100%
Input 2_PID control and
Temperature control
operation [MC-(V)COS]
Input 2_Output limiter high
0%
Input 2_Output limiter low
100%
Heating/Cooling PID
control
Input 1_Output limiter high [heat-side]
0%
Input 1_Output limiter low [heat-side]
100%
Input 1_Output limiter high [cool-side]
0%
Input 1_Output limiter low [cool-side]
100%
Input value
state
The Measured value (PV) is not inside the Input error range.
[Input error range: Input error determination point (high)
Measured
value (PV), Input error determination point (low)
Measured value
(PV)]
Requirements for Autotuning (AT) cancellation
Autotuning (AT) is immediately aborted and PID control starts when an error is
detected in “AT/ST status monitor.” The PID values will be the same as before
Autotuning (AT) was activated.
R
efer to “AT/ST status monitor” on the previous page for details.
Autotuning (AT) may be aborted in the following cases except for the conditions in
“AT/ST status monitor.”
・
When the instrument is in FAIL state.
・
When the power supply is disconnected.
Parameter setting
Input 1_Autotunning (AT) [Operation Transfer Mode]
Parameter symbol
Data range
Factory set value
1.
U
AT U
oFF
: PID control
on
: Start Autotuning
When Autotuning (AT) is finished, the control will
automatically return to “
oFF
.”
oFF
To display “Input 1_Autotuning (AT)”, choose a setting other than “3 to 7
(Pressure control operation [MC-
(V)COS(R)])” in Function block No.51: Input 1_
Control action (Engineering mode).
Input 2_Autotunning (AT) [Operation Transfer Mode]
Parameter symbol
Data range
Factory set value
Содержание SC-F71
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