Auto Tuning Function - Mitsubishi Q Series User Manual

3 SPECIFICATIONS

3.2.1 Auto tuning function

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(1) What is the auto tuning function?
(a) The auto tuning function is designed for the Q62HLC to set the optimum
PID constants automatically.
In auto tuning, a manipulated value turns ON/OFF and the PID constants
are calculated according to the hunting cycle and amplitude, which take
place when the measured value to a set value alternates between
overshooting and undershooting.
(b) Setting the following data with normal mode enables auto tuning to be
executed.
Buffer memory address name
Input range
Set value (SV) setting
AT differential gap
AT additional lag
AT bias
Note that since actual control starts on completion of auto tuning, the
other data should be preset to the values used for actual operation.
Buffer memory address name
Upper output limiter
Lower output limiter
Output variation limiter
Sensor compensation value
setting
Primary delay digital filter setting
Forward/reverse action setting
(c) On completion of auto tuning, calculated values are set to the following
buffer memory addresses.
Buffer memory address name
Proportional band (P) setting
Integral time (I) setting
Derivative time (D) setting
Loop disconnection detection
judgment time
: As the loop disconnection detection judgment time, a value twice greater than
the calculated integral time is set. However, the loop disconnection detection
judgment time remains unchanged from 0 when it is 0 at an auto tuning start.
Buffer memory address (Decimal)
CH1
32
34
46
47
53
Buffer memory address (Decimal)
CH1
42
43
44
45
48
54
Buffer memory address (Decimal)
CH1
35
36
37
59
MELSEC-Q
CH2
64
66
78
79
85
CH2
74
75
76
77
80
86
CH2
67
68
69
91
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