Micromod Micro-DCI: 53SL5100A Single Loop Controller Manual de usuario descargar pdf (Pagina 110)

Single Loop Process Controller Instruction Manual

102 Instrument Tuning

Table 10-4. Step Response Method

Step Procedure

Set the process to approximately normal conditions in Manual mode.

Introduce a 10% (approximate) step change to the manually regulated signal to the

valve. Observe the magnitude of the step in percent of full signal span F. Also plot a

graph of the resulting transient curve traced by the controlled variable.

Draw a straight line tangent to a point on the curve having the greatest slope (most

linear).

Measure the apparent dead time L in minutes as shown in Figure 10-1.

Measure RL, the product of the slope and dead time as shown in Figure 10-1. This

value should be expressed in percent of full scale span.

Compute the best settings as follows:

A. Proportional (P): P.B. = (100 RL)/ F.

B. Proportional & Integral(PI): P.B. = (100 RL)/ F, TR = 3L

C. Proportional, Integral, and Derivative (PID): P.B. = (80 RL)/ F, TR = 2L, TD = 0.5L

Figure 10-1. Typical Step Response Method

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Micromod Micro-DCI: 53SL5100A Single Loop Controller Manual de usuario Pagina 110