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8.3.7
Auto tuning function
The auto tuning function is designed for the temperature control module to set the optimum PID constants
automatically. In auto tuning, the PID constants are calculated according to the hunting cycle and amplitude generated
by repeated overshoot and undershoot of the temperature process value (PV) toward the set value (SV).
(1) Auto tuning operation
The temperature control module operates as follows.
1
Starts auto tuning.
Collects data from the point when the temperature process value (PV) reaches the set value (SV) after the first overshoot and
2
undershoot.
3
After data collection, auto tuning ends when PID constants and loop disconnection detection judgment time are set.
Set value (SV)
(Temperature process value (PV))
1 Start of auto tuning
CH□ Auto tuning instruction
OFF
(RY20 to RY23)
CH□ Auto tuning status
OFF
(RX20 to RX23)
Remark
The time takes for auto tuning depends on the control subject.
Operation of the temperature control module
Temperature process
value (PV)
ON
ON
Controlled by the program
Controlled by the temperature control module
The first overshoot and
undershoot are ignored.
2 Data collection
During auto tuning
CHAPTER 8 FUNCTIONS
Standard
Heating-cooling
3 End of auto tuning
Time
Temperature
control
159
8
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Troubleshooting
