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9
Chapter
Auto-tuning
Auto-tuning automatically calculates PID.
Select from three types of auto-tuning in the operation menu
("
ooo
oPPPPEEEE CCCChhhh1111
").
●
If auto-tuning has not finished after four or more hours have
passed, check the following:
•
Input/output connections
•
Control output operation (normal/reverse)
•
Sensor input type
●
If there are any significant changes in the operating environment,
such as those below, auto-tuning must be restarted.
•
Large change in SV
•
Change in input range
•
Large change in controlled device
●
Please note the following
•
The PID parameters after auto-tuning has finished will be
saved even if power is cut off. If power is cut off before
auto-tuning is finished, PID parameters will not be
changed and auto-tuning will need to be restarted.
•
Control reverts to ON/OFF (2 setting) during auto-tuning,
so some processes may experience large changes in PV.
If you are running a process that cannot accommodate
large changes in PV, do not use auto-tuning. Auto-tuning
is also not suitable for processes requiring rapid
response to voltage or flow controls.
•
Restart auto-tuning if SV changes drastically, PV input
type changes or the control object conditions change.
Auto-tuning can be activated even if the control type is
fuzzy or PID2.
AT
Parameter
Operation
Function
oFF
Stop/Finish
Stops or finishes auto-tuning
on
Normal type
Standard auto-tuning. Choose this
option under normal circumstances.
Lo
Low PV type
Auto-tuning that runs at SV-10%.
Use this to minimize overshoot.
Point
Set the following parameters before running auto-tuning.
• PV input type/ PV input upper limit/ PV input lower limit/
decimal point position on the setup channel menu
("
PvT Ch 6
").
• OUT1 proportion cycle (OUT2 proportion cycle) in the
PID channel menu ("
Pid Ch 2
").
Refer to
See "Auto-Tuning" for more information on Auto-Tuning. (p. 25)
PV
t
set
value
start AT
calculating AT
PID
control
SV
PV
t
set
value
start AT
calculating AT
PID
control
SV
SV-
10%FS
Caution
Auto-tuning is not performed in manual mode or standby
mode.
Содержание PXG4
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Страница 10: ...9 1 Chapter Chapter 1 Part Names and Functions Part Names and Functions 10...
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Страница 106: ...105 9 Chapter Behavior when control is lost Limit Cycle PV SV Time tuning MV control lost 100...
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Страница 132: ...131 13 Chapter Chapter 13 Password Setup Ch11 Overview of Password Setup Ch11 132 Passwords 1 to 3 132...
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Страница 152: ...151 16 Chapter Chapter 16 Troubleshooting Troubleshooting 152...
Страница 154: ...153 17 Chapter Chapter 17 Appendix Delay Start Function 154 Return to Factory Default Setting Function 155...
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