Watlow CLS200 - Manual (Page 176)

Chapter 8: Tuning and Control CLS200 Series User’s Guide
160 Watlow Anafaze Doc.# 0600-3050-2000
Integral Settings
The controller’s integral parameter (TI) is set in seconds
per repeat. Some other products use an integral term called
reset, in units of repeats per minute. Table 8.2 shows inte-
gral settings versus reset settings.
Table 8.2 Integral Term and Reset Settings
As a general rule, use 60, 120, 180 or 240 as a starting val-
ue for the integral.
Derivative Settings
The controller’s derivative parameter (TD) 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 8.3 shows derivative versus rate. Rate = Derivative/
60.
Table 8.3 Derivative Term Versus Rate
As a general rule, set the derivative to 15% of integral as a
starting value.
Integral
(Seconds/Repeat)
Reset
(Repeats/Minute)
Integral
(Seconds/Repeat)
Reset
(Repeats/Minute)
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