Determine the proper settings for proportional gain and reset time on a two-mode controller using the Ziegler-Nichols Continuous Cycling method, the process identification curve in Figure 12-4a, and Table 12-4b.
Figure 12-4a
Controller Mode
Proportional Gain Kc
Proportional Band PB
Reset Time Ti (Minutes per Repeat)
Reset Rate Tr (Repeats per Minute)
Derivative Time Td
P
0.5 Gu
2 PBu
N/A
N/A
N/A
PI
0.45 Gu
2.2 PBu
Pu/1.2
1.2/Pu
N/A
PID
0.6 Gu
1.7 PBu
0.5 Pu
2/Pu
Pu/8
Table 12-4b
What will be an ideal response?
Proportional Setting = Kc = 0.45 Gu = 0.45 ´ 10 = 4.5 (proportional gain)
Integral Setting = Ti = Pu/1.2 = 2 minutes/1.2 = 1.67 (reset time)
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