When control characteristics are already known, the PID parameters can be set
directly to adjust control.
PID parameters are set in the “proportional band” (P), “integrated time” (I) and
“derivative time” (D) parameters (level 1 mode).
For details on the setting ranges of these parameters, see chapter 5 Level 1 Mode
(page 5-11).
About PID Parame-
ters
CHAPTER 3 BASIC OPERATION
E5CK
3--14
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 fluctuations in
the process value.
Set point
Start of AT
execution
End of AT
Time
Limit cycle of MV
change width 100%
In this example, let’s execute 40%AT.
(1) Select [
] (level 1 mode) using the
or
keys. For details on
selecting the menu display, see page 1-7.
(2) Press the
key to enter the level 1 mode. The top parameter in the
setup mode [
] “AT execute/cancel” is displayed. In this example,
the parameter setting is [
] “AT cancel”
(3) Press the
key to specify [
].
(4) The AT LED flashes, and AT execution starts. When the AT LED goes
out (end of AT execution), the parameter automatically returns to
[
] (“AT cancel”).
•
In addition to AT, the E5CK is also provided with fuzzy self-tuning (ST)
that allows automatic calculation of the PID parameters suited to the
control target. However, note that the ST function operates only during
standard control by temperature input. For further information regard-
ing the ST, please see page 5-29 and A-10.
F
100%AT
Setting Example
AT execute
