Micromod Micro-DCI: 53SL5100A Single Loop Controller Manuel d'utilisateur télécharger pdf (Page 109)

Single Loop Process Controller Instruction Manual

Instrument Tuning 101

lntroduce automatic reset slowly by decreasing TR (C107) until cycling starts.

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

Set the process to approximately normal conditions in Manual mode.

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.

Set P.B. (C106~ to the widest value 1000%).

Set TD (C108) to the lowest value (0.01 minutes).

Switch to Auto mode.

Slowly reduce P.B. (C106) until process cycling starts.

When a slight cycle is repeatedly established, measure the peak-to-peak period of

oscillation and record it as T minutes.

Observe the P.B. setting and record it as P.

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

1 2 ... 104 105 106 107 108 109 110 111 112 113 114 ... 151 152

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Micromod Micro-DCI: 53SL5100A Single Loop Controller Manuel d'utilisateur Page 109