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(3) Procedure for the self-tuning control
The following is the flow chart for the control.
Self-tuning start
Has the
temperature control been started?
Or has the set value (SV) been
changed?
CH□ Auto tuning status (RX20 to RX23) turns on.
(Starting ST)
CH□ PID auto-correction status (b0 of RWr14 to RWr17)
turns off.
The module is controlled with the set PID constants.
PID constants are calculated by self-tuning.
Has the response failed?
The setting is changed to the PID constants calculated
by self-tuning.
CH□ PID auto-correction status (b0 of RWr14 to RWr17)
turns on.
CH□ Auto tuning status (RX20 to RX23) turns off.
Temperature is controlled with the set PID constants.
Self-tuning completion
186
NO
YES
NO
YES
Has the
temperature process value (PV)
become out of the set value (SV)?
YES
Is the response erratic?
YES
CH□ Auto tuning status (RX20 to RX23) turns on.
(Vibration ST)
CH□ PID auto-correction status (b0 of RWr14 to RWr17)
turns off.
PID constants are calculated and changed by
self-tuning.
CH□ PID auto-correction status (b0 of RWr14 to RWr17)
turns on.
NO
NO
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Troubleshooting
