Table 10-3. proportional cycle method, Table 10-3 – Micromod Micro-DCI: 53SL5100A Single Loop Controller User Manual
Page 109

Single Loop Process Controller Instruction Manual
Instrument Tuning 101
12
lntroduce automatic reset slowly by decreasing TR (C107) until cycling starts.
13
Back off TR (C107) to a safe margin of about 1.5 times the value attained in Step 12.
Table 10-3. Proportional Cycle Method
Step
Procedure
1
Set the process to approximately normal conditions in Manual mode.
2
Set TR (C107) first to minimum value (0.02 minutes) for several moments, then set it
to extreme maximum (200 minutes) to lock in a fixed reset value.
3
Set P.B. (C106~ to the widest value 1000%).
4
Set TD (C108) to the lowest value (0.01 minutes).
5
Switch to Auto mode.
6
Slowly reduce P.B. (C106) until process cycling starts.
7
When a slight cycle is repeatedly established, measure the peak-to-peak period of
oscillation and record it as T minutes.
8
Observe the P.B. setting and record it as P.
9
Compute the best settings as follows:
A. Proportional & Integral (PI): P.B. = 2 (P), TR = 0.8(T)
B. Proportional & Derivative (PD): P.B. = 0.8(P), TD = 0.12(T)
C. Proportional, Integral, and Derivative (PID): P.B. = 1.5(P), TR = 0.5(T), TD = 0.12(T)
Table 10-2. Trial and Error Tuning Method (Continued)
Step
Procedure