23
control
outuput
ON
ON
ON
OFF
OFF
AT=ON
ON/OFF control
Time
AT end on The
3rd peak
PID control
PV
SV
AT operation
【Standard AT】
control
outuput
ON
ON
ON
OFF
OFF
AT=ON
ON/OFF control
Time
SV -10% of
SV scale
PID control
지시치
SV
AT POINT
AT operation
【Low PV AT】
8-1-8. Auto Tuning Setup Group
Signal
Item
Setup range
Display condition
Initial value
Auto tuning setup group
Setup below items.
Please select 1 at “ the AT operation selectin” to run.
Auto tuning type
STD : Standard AT
LOW : Low PV AT(*1)
Except
RUN& ON/OFF
STD
AT operation selection
OFF/1~4
Except
RUN& ON/OFF
OFF
Caution
● Auto Tuning Operation/Stop
Do not use the auto tuning function in the following process.
- Control process with fast response system such as flow control and pressure control.
- Process that doesn’t allow ON and OFF of an output not even momentarily.
- Process that can’t handle huge loads in the operation.
- Process that is in danger of having negative influence on the product quality by exceeding the allowed range of changes in set value.
- If the desired set value is changed during AT, the changed goal will carry out AT and when AT is completed, the desired set
value will be changed to the new value.
- When burn out and A/D error occurs during AT, AT will be stopped and Preset output will be outputted.
(*1) When Low is selected from the auto tuning type selection, it is operated from the -10% of the set value.
※The symbol for the auto tuning setup group is only indicated in operative period. The auto tuning output is not indicated if
ON-OFF has been already selected.
1) Selection of Auto Tuning Type :
Must select one method from the two types : standard auto tuning method and low process value auto
tuning method. The standard auto tuning method is a method that operate based on the set value and low
process value auto tuning is operating from the -10% value of the set value scale (set value scale : Scale
from the minimum range or the maximum range to the set value scale.) If such method is selected, the over
shoot on the set value can be reduced since it’s controlling from the operated PID value.
※ What is Auto Tuning?
It refers to the automatic setup function for optimum PID number by a controller that automatically
measures and calculates the characteristics of the control system. The auto tuning method generates
limited cycle by producing ON/OFF control output during the 2.25 time frame and then calculates PID
base on the time frame and amplitude.
2) Selection of Auto Tuning Operation
:
As for the auto tuning operation selection, can choose from OFF or 1~4 groups and if OFF is selected,
auto tuning is not executed. If #1 of the groups from 1~4 groups have been selected, then the auto tuning
is executed and stored in #1 PID when the operation is completed.
3) Stop on Auto Tuning
:
If desire to stop the long hours of auto tuning, select off during auto tuning operation. It returns to PV/SV
indication screen after OFF selection.
