Omron E5EK User Manual

CHAPTER 3 BASIC OPERATI ON
E5EK
3--16
• AT (auto-tuning) cannot be executed while operation is canceled or
during ON/OFF control.
• When you execute auto-tuning, the optimum PI D parameters are
automatically set by forcibly changing the manipulated variable to
calculate the characteristics (called the “limit cycle method”) of the
control target. During auto-tuning, the AT LED flashes.
• 40%AT or 100%AT can be selected by the limit cycle of MV change
width. Specify [
]or[ ], respectively, in the “AT execute/
cancel” parameter (level 1 mode).
• During heating and cooling control and with position-proportional
type, only 100%AT can be executed. (So, [
](40%AT)willnotbe
displayed.)
• To cancel AT execution, specify [
](“ATcancel”).
In order to set the limit cycle of MV change width to 40%, sel ect 40%AT
to execute auto-tuning with fluctuations in the process value kept to a
minimum. However, note that auto-tuning takes lon ger to execute
compared with 100% AT.
The timing by which limit cycles are generated varies according to
whether or not the deviation (DV) at the start of AT execution is 10%
full-scale or less.
Deviation at start of A T
execution ≧ 10 % full-sca le
Deviation at start of A T
execut io n < 10% full-sca le
Limit cycle of MV change
width 40%
Limit cycle of MV change
width 40%
Set point Set point
StartofAT
execution
End of AT Start of AT
execution
End of AT
Time Time
Deviation 10%
full-scale
Deviation 10%
full-scale
In order to set the limit cycle of MV change width to 100%, select 100%
AT to shorten the AT execution time without worrying about fluctua-
tions in the process value.
Set point
StartofAT
execution
End of AT
Time
Limit cycle of MV
change width 100%
JAuto-tuning
(A.T.)
F 40%AT
F 100%AT

Omron E5EK Specifications

General

Brand	Omron
Model	E5EK
Category	Controller
Language	English