Auto Tuning Function - Mitsubishi Electric MELSEC-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) To execute the function, set values to the following buffer memory
addresses in normal mode.
Buffer memory area name
Input range
Set value (SV) setting
AT differential gap
AT additional lag
AT bias
Note that actual control starts upon completion of auto tuning. Set values
used for actual operation to other buffer memory addresses as well.
Buffer memory area name
Upper output limiter
Lower output limiter
Output variation limiter
Sensor compensation value
setting
Primary delay digital filter setting
Forward/reverse action setting
(c) Upon completion of auto tuning, calculated values are set to the following
buffer memory addresses.
Buffer memory area name
Proportional band (P) setting
Integral time (I)
Derivative time (D)
Loop disconnection detection
judgment time
1 : A value twice greater than the calculated integral time is set.
*
If 0 is set when the auto tuning starts, the value remains unchanged.
*1
Buffer memory address (decimal)
CH1 CH2
32
34
46
47
53
Buffer memory address (decimal)
CH1 CH2
42
43
44
45
48
54
Buffer memory address (decimal)
CH1 CH2
35
36
37
59
MELSEC-Q
64
66
78
79
85
74
75
76
77
80
86
67
68
69
91
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