[At] Auto-Tuning (006) - Fuji Electric Micro-Controller X Socket type Operation Manual

At Auto-tuning (006)
[Description] –––––––––––––––––––––––––––––––––––––––––––––––––––––––
Running auto-tuning automatically sets the optimal PID.
Setpoint
oFF Stops or finishes the auto-tuning.
Starts the normal auto-tuning.
oN
L-oN Starts the low-PV auto-tuning.
There are the following two types in auto-tuning.
●
Normal type
Performs ON/OFF operation with SV as the baseline to
calculate PID.
Low-PV type
Perfoms ON/OFF operation with SV-10% to calculate PID.
Use this setting if you want to prevent overshoot.
AT indicator lights during auto-tuning. (see page 11)
●
When auto tuning is normally completed, the automatically set PID parameter value is maintained even if the
●
power is turned off. If the power is turned off during auto tuning, the auto-tuning function is invalidated with PID
parameters unchanged. In such a case, start again from the beginning.
Since ON-OFF operation (2-position operation) is performed during auto tuning, PV may fluctuate greatly
●
depending on the process. Do not perform auto tuning for the processes where large fluctuation of PV is not
allowed. Do not perform auto tuning, either, for the processes where the response is quick, such as pressure
control or flow rate control.
If auto tuning does not end after 4 hours, it means that tuning may not be completed successfully. Check input/
●
output wiring and parameters such as control output (forward, reverse) and input sensor type.
Carry out the auto-tuning again when:
●
• you change SV ,
• you change PV input type , or
• operation does not work properly due to the change in operating conditions .
You can run auto-tuning when the control type is set to " FUZY " or " Pid2 ." (see page 36)
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You cannot run auto-tuning during manual mode. (see page 20)
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When you are using the PID selection function, the auto-tuning result for the selected PID group is stored.
●
Auto tuning is forcibly terminated when SV is changed by the ramp soak function, remote SV function, or ramp
●
SV.
Since ON/OFF control is performed during auto-tuning, overshoot against the SV
may occur. To reduce the overshoot, execute the auto-tuning with " L-oN " (Low PV).
Related parameters: [CtRL] (see page 36)
Description
AT start
Process
Value
SV
Process
AT start
Value
SV
25
1st block parameter
AT calculating
PID
PV
Control
t
AT calculating
SV-10%FS
PID
PV
Control
t