Self-Tuning - Fuji Electric PXR4 Instruction Manual

6-3 Self-tuning

1) At power on, changing a set value or the external disturbance, tuning is made automatically so that the PID
parameters are re-optimized.
It is useful where modification of PID parameters is required repeatably due to frequent change in process
condition.
If high controllability is important, select the PID or fuzzy control algorithm and use auto-tuning.
2) Setting for self-tuning
q Turn on the power and set the SV.
w Select SELF at "CTrL" (control algorithm) parameter.
e Turn off the power once.
r Turn on the power of the whole system. The controller should be turned on at the same time with the
other equipments or even later. Otherwise, the self-tuning might not be performed successfully.
t Self-tuning starts. Then the point indicator at the lower right corner starts
blinking until the PID parameters are re-optimized.
Note) Whenever it is necessary to re-try the self-tuning, please set "CTrL" = PID once, and then start the
above setting procedure from the beginning.
2nd block parameter
· Set "CTrL" (control algorithm) as SELF.
PID
FUZY Fuzzy control
SELF Self-tuning control
3) Self-tuning indication
C1 C2 AL1 AL2
PV
SV
The point indicator at the lower
right corner keeps blinking while
self-tuning is underway.
PV
SV
PID control
SV
PV
SV
Setting "CTrL" to SELF starts
Caution
self-tuning.
Tuning
L T
– 20 –
L : Dead time
T : Delay time