CLS200 Series User’s Guide
Chapter 7: Turning and Control
137
Table 7.2
—
Integral Term and Reset Settings
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
As a general rule, use 60, 120, 180 or 240 as a starting value 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 7.3
shows derivative versus rate.
Rate = Derivative/60.
Table 7.3
—
Derivative Term Versus Rate
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
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 differently. Parameters may not be taken from one controller
and applied to another with optimum results even if the above unit conversions are
performed.
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