Mitsubishi Electric MELSEC Q Series User Manual page 45

3 SPECIFICATIONS
(Temperature set value)
Start of auto tuning
Auto tuning
start command
(Yn4 to Yn7)
Auto tuning status
(Xn4 to Xn7)
3 - 7
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POINT
After powering off the programmable controller CPU, you can use the set PID
constants in the following method.
• Write the values directly to the buffer memory using the sequence program.
• Store the PID constants into E
programmable controller CPU.
• Use the initial settings of the GX Configurator-TC.
(c) Auto tuning operation
Auto tuning performs operation as shown below.
1) Auto tuning output is provided.
2) Data collection starts when the process value returns to the set value
after the first overshoot and undershoot.
3) After data collection, auto tuning ends when PID constants and loop
disconnection detection judgment time are set.
Process value (PV)
Set value (SV)
ON
OFF
ON
OFF
search engine
2
PROM and transfer them when powering on the
The first overshoot and
undershoot are ignored.
Set value (SV)
(Temperature set value)
Auto tuning in execution
MELSEC-Q
End of auto tuning
Data collection
Temperature
control
Time
3 - 7