User Manual

Operating Instructions Temperature Indicating Controller CF1H
V 1.2
•
01/2007 - 54 -
8.3 PID auto-tuning of this controller
In order to decide each value of P, I, D and ARW automatically, this system
gives the fluctuation to the controlling object by force.
(1) When the diff ere n ce b e tween sett ing value and processing temperature
is la rge w hen the temperature rises.
Fluctuation is given at the temperature 1.5 % of scaling span less than the setting value.
(2) When the control is stable or when control temperature is within ±1.5 %
of scaling span.
Fluctuation is given at the setting value.
(3) When the control temperature is 1.5 % or greater of scaling span higher
than the setting value.
Fluctuation is given at the temperature 1.5 % of scaling span higher than the setting value.
1.5% of scaling span
Controlling action is performed
with the values set by PID
auto-tuning.
Setting value
Time
Temperature
[Figure 8.3-1]
Temperature
Setting value
Time
Controlling action is performed
with the values set by PID
auto-tuning.
[Figure 8.3-3]
1.5% of scaling span
Temperature
Setting value
Starting point of auto-tuning
[Figure 8.3-2]
Time
Controlling action is performed
with the values set by PID
auto-tuning.