15
Auto-tuning (Setting range: 0, 1, 2)
[Description]
• PID value can be set automatically.
• Once PID value is set automatically
by auto-tuning, it is saved in the con-
troller even when the power is turned
OFF, so auto-tuning function is not
required any further.
• Auto-tuning is started by setting 1
or 2 in AT parameter. AT value is
automatically reset to 0 at the end
of auto-tuning.
• At the end of auto-tuning, control
action is started automatically by
setting PID.
• During auto-tuning, the decimal
point at 1 digit of SV display flick-
ers.
• When auto-tuning is forcedly sus-
pended, set AT value to 0 or turn
OFF the instrument power.
• AT is available in the following 2
types.
Example) Starting auto-tuning
Key operation
Description
Press the SEL key to display P.
Press the SEL key repeatedly until
is displayed.
Press the or key to display
1.
Press the DATA key once.
Current data of 0 is displayed.
Press the SV key when you need to
display the operation status display.
Decimal point in 1st digit blinks.
In case of the type of 2-stage
display, decimal point in the
1st digit of the lower stage
blinks.
(In auto-tuning)
When auto-tuning is finished,
decimal point is the 1st digit stops
blinking.
(Auto-tuning ends)
Blinking disappears.
After pressing the ENT key, auto-
tuning is started automatically.
Display
SEL
ENT
SV
DATA
SEL
• Auto-tuning is available just after
the start of operation or in the stare
of stable control.
Setting
code
1
2
Method
SV type
SV ON-OFF action
Low PV type
SV-10%FS ON-OFF action
During auto-tuning, ON-OFF
control is performed which causes
overshoot for SV. But, the over-
shoot can be eliminated by low PV
type auto-tuning.
Related parameter: P (Page 6)
I (Page 7)
D (Page 8)
CooL (Page 17)
Ar (Page 21)
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