159
CHAPTER 8 FUNCTIONS
8
8.
3 T
e
mperat
ure Cont
rol
M
ode
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.
Remark
The time takes for auto tuning depends on the control subject.
Operation of the temperature control module
1
Starts auto tuning.
2
Collects data from the point when the temperature process value (PV) reaches the set value (SV) after the first overshoot and
undershoot.
3
After data collection, auto tuning ends when PID constants and loop disconnection detection judgment time are set.
Standard
Heating-cooling
Set value (SV)
(Temperature process value (PV))
Time
Temperature process
value (PV)
1 Start of auto tuning
2 Data collection
During auto tuning
3 End of auto tuning
ON
OFF
ON
OFF
The first overshoot and
undershoot are ignored.
Temperature
control
Controlled by the program
CH□ Auto tuning instruction
(RY20 to RY23)
CH□ Auto tuning status
(RX20 to RX23)
Controlled by the temperature control module
Summary of Contents for NZ2GF2B-60TCRT4
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