FUZZY SELF-TUNING
E5EK
A-- 15
If the step control amount is applied b efore the maximum temperature
slope (R) is obtained, SRT will not renew any PID constant. If the pro -
portional band obtained from the R and L values that were measured
before the imposition had been completed is larger than the present
proportional band, the PID constants will be renewed b ecause the mea-
sured value is in the direction towards the suitable proportional band
value, and the set point at that time will be the SRT-executed set point.
Temperature
Slope (R)
Stable range
Time
SP
F Stable Temperature Status
If the temperature is within the stable range for a certain time, it is
deemed that the temperature is stable. This time is called stability
judgement time. Like PID constants, stability judgement time is
adjusted with fuzzy self-tuning according to the characteristics of the
object to be controlled. Fuzzy self-tuning will not be activated if the
temperature is stable because the Temperature Controller deems that
temperature control is smooth.
Stable
Stable range
Stable range
Stable
Stability judgement time
Set point
Shorter than the stability judgement time
(Set to 15.0_C
before shipping)
F Balanced Status
If the p rocess value is within the stable range for 60s when there is no
output, it is deemed that the temperature is balanced.
F PID Constant
Refreshing
Conditions
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