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 Q64TC to set the optimum PID
constants automatically.
In auto tuning, the PID constants are calculated according to the hunting
cycle and amplitude which take place when a manipulated value turned on/off
alternates between overshooting and undershooting a set value.
(b) Setting the following data enables auto tuning to be executed. Note that since
actual control starts on completion of auto tuning, the other data should be
preset to the values used for actual operation.
When "0" has been set to the proportional band (P), auto tuning is not
executed.
Buffer memory address name
Input range
Set value (SV) setting
Upper output limiter
Lower output limiter
Output variation limiter
Sensor compensation value
setting
Control output period setting
Primary delay digital filter setting
AUTO/MAN mode switch
AT bias
Forward/reverse action setting
Auto tuning mode selection
(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
1 : 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.
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CH1
20
H
22
H
2A
H
2B
H
2C
H
2D
H
2F
H
30
H
32
H
35
H
36
H
B8
H
CH1
23
H
24
H
25
H
3B
H
1
MELSEC-Q
Address (Hexadecimal)
CH2 CH3 CH4
40 60 80
H H
42 62 82
H H
4A 6A 8A
H H
4B 6B 8B
H H
4C 6C 8C
H H
4D 6D 8D
H H
4F 6F 8F
H H
50 70 90
H H
52 72 92
H H
55 75 95
H H
56 76 96
H H
B9 BA BB
H H
Address (Hexadecimal)
CH2 CH3 CH4
43 63 83
H H
44 64 84
H H
45 65 85
H H
5B 7B 9B
H H
3 - 5
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H