Instruction manual

43
[Auto-tuning performing conditions]
(A) When processing temperature is lower than [SV –20 (40 )]
The AT process will fluctuate at the temperature 20 (40 ) lower than the SV.
(1) Calculating PID
constant
(2) PID constant
calculated
(3) Controlled by the
PID constant set
by auto-tuning.
(Fig. 7.7-2)
(B) When the control is stable or when processing temperature is within
[SV 20 (40 )]
The AT process will fluctuate around the SV.
(1) Calculating PID
constant
(2) PID constant
calculated
(3) Controlled by the
PID constant set
by auto-tuning.
(Fig. 7.7-3)
(C) When the processing temperature is higher than [SV+20 (40 )]
The AT process will fluctuate at the temperature 20 (40 ) higher than the SV.
Temperature 20 (40 ) higher than the SV
(1) Calculating PID
constant
(2) PID constant
calculated
(3) Controlled by the
PID constant set
by auto-tuning.
(Fig. 7.7-4)
Temperature 20 (40 ) lower than the SV
(1)
(2) (3)
AT starting point
SV
Temperature
Time
AT starting point
(1)
(2)
(3)
Temperature
SV
Time
AT starting point
(1)
(2)
(3)
Temperature
SV
Time