38
Determining PID Constants (AT, ST, Manual Setup) Section 3-8
(3) In this state, the change width of the PV every 60 seconds is at the ST
stable range or less.
PID constants are not modified for the currently preset set point by self-tuning
(ST) in the following instances:
1,2,3... 1. When the PID constants have been changed manually with ST set to ON.
2. When auto-tuning (AT) has been executed.
3-8-4 ST Stable Range
The ST stable range is a condition for determining the conditions under which
ST (self-tuning) functions.
In this example, let’s set the ST stable range to 20
°C.
1,2,3... 1. Select the “ST stable range” parameter by pressing the key in the “ad-
vanced function setting level”.
To move to this level, see 4-8 Moving to the Advanced Function Setting
Level.
2. Set to 20
°C (deviation) using the or key.
3-8-5 Manual Setup
The individual PID constants can be manually set in the “proportional band”,
“integral time”, and “derivative time” parameters in the “adjustment level”.
In this example, let’s set the “proportional band” parameter to “10.0”, the “inte-
gral time” parameter to “250” and the “derivative time” parameter to “45”.
1,2,3... 1. Press the key to move from the “operation level” to the “adjustment
level”.
2. Select “proportional band” by pressing the key
3. Press the or key to set the parameter to “10.0”.
Operation Procedure
ST stable rang
Advanced function setting level
Operation Procedure
Adjustment level
at
off
AT execute/
cancel
Proportional
band
p
8.0
C
p
10.0
C
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