Watlow PPC-2000 Manual de usuario descargar pdf (Pagina 255)

PPC-2000 User’s Guide Chapter 6: Tuning and Control

Doc.# 30002-00 Rev 2.3 Watlow Anafaze 227

Table 6.2 Integral Term and Reset Settings

As a general rule, use 60, 120, 180, or 240 as a starting value

for the Integral.

Derivative Settings

The controller’s Derivative parameter is programmed in

seconds. Some other products use a derivative term called Rate

programmed in minutes. Use the table or the formula to

convert parameters from one form to the other. Table 6.3 shows

Derivative versus Rate; Rate = Derivative/60.

Table 6.3 Derivative Term vs. Rate

As a general rule, set the Derivative to 15% of Integral as a

starting value.

NOTE!

While the basic PID algorithm is well defined and

widely recognized, various controllers implement it

such that parameters may not be taken from one

controller and applied to another with optimum

results even if the above unit conversions are

performed.

Integral

(sec/repeat)

Reset

(repeat/min)

Integral

(sec/repeat)

Reset

(repeat/min)

30 2.0 210 0.28

45 1.3 240 0.25

60 1.0 270 0.22

90 0.66 300 0.20

120 0.50 400 0.15

150 0.40 500 0.12

180 0.33 600 0.10

Derivative

(seconds)

Rate

(minutes)

Derivative

(seconds)

Rate

(minutes)

5 0.08 35 0.58

10 0.16 40 0.66

15 0.25 45 0.75

20 0.33 50 0.83

25 0.41 55 0.91

30 0.50 60 1.0

1 2 ... 250 251 252 253 254 255 256 257 258 259 260 ... 319 320

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Watlow PPC-2000 Manual de usuario Pagina 255

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