LSIS XBF-AH04A

Chapter 15 PID Function (Built-in function)
15 - 5
< Figure 15.2 simulation of proportional control >
(b) Concerning the result of simulation, it has the maximum overshoot of about 23.4℃ at 0.62s
and after 7s, it converges at 48.49℃ with offset of 1.51℃ (about 3%).
(c) Offset is an unavoidable error when only P control is executed. Offset decreases proportional
to P coefficient but overshoot increases proportional to P coefficient. Table 15.3 and Figure
15.3 is simulation of offset and overshoot according to P coefficient.
Time
Target
temperature
Kp = 5
Kp = 2.5
Kp = 1
0
50
0
0
0
1
50
45.02
63.46
46.67
2
50
53.11
42.52
46.77
3
50
50.15
47.93
41.38
4
50
50.22
47.25
41.60
5
50
48.27
46.96
43.30
6
50
48.35
46.92
43.25
7
50
48.44
46.90
43.21
8
50
48.53
46.90
43.18
9
50
48.53
46.90
43.18
<Table 15.3 Temperature- time table according to P coefficient>
Offset
Max. overshoot