Mitsubishi Q Series User Manual page 40

3 SPECIFICATIONS
Process value (PV)
Set value (SV)
(Temperature set value)
Start of auto tuning
OFF
Yn4,Yn5
OFF
Xn4,Xn5
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(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.
ON
ON
(d) Precautions for auto tuning
The following indicate the conditions under which auto tuning will result in
abnormal termination.
1) Any of the following setting items for the channel has been changed
during execution of auto tuning.
Setting item
Input range
Set value (SV) setting
Upper output limiter
Lower output limiter
Output variation limiter
Sensor compensation value setting
AT differential gap
AT additional lag
Primary delay digital filter setting
AT bias
Forward/reverse operation setting
The first overshoot and
undershoot are ignored.
Data collection
Auto tuning in execution
Buffer memory
CH1
32
34
42
43
44
45
46
47
48
53
54
MELSEC-Q
End of auto tuning
Temperature
address
(Decimal)
CH2
64
66
74
75
76
77
78
79
80
85
86
Time
control
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