LSIS XBF-DC04A - Page 556

Chapter 15 PID Function (Built-in function)
15 - 7
Time
Target
temp.
Proportional
coefficient
Integral
time
P Control
PI Control
5
50
2.5
1.5
46.96
49.70
6
50
2.5
1.5
47.12
50.38
7
50
2.5
1.5
47.03
49.76
8
50
2.5
1.5
47.07
50.14
9
50
2.5
1.5
47.06
49.94
10
50
2.5
1.5
47.06
50.02
11
50
2.5
1.5
47.06
49.99
12
50
2.5
1.5
47.06
50.00
13
50
2.5
1.5
47.06
50.00
14
50
2.5
1.5
47.06
50.00
15
50
2.5
1.5
47.06
50.00
< Table 15.4 Temp.- time table >
(d) Considering table 15.4 and Figure 15.4, if P and I control is used together, offset is removed
and temp. converges at 50℃, target temp. after 12s
(e) But in this case, convergence time is longer than that of P control and overshoot is larger.
Generally, as integral time increases, overshoot decrease. About this, refer to the Figure 15.5.
< Figure 15.4 Temp.- time graph >