Derivative settings, Derivative settings 116, Table 5.2—integral term and reset settings 116 – Watlow Series D8 User Manual
Page 134: Table 5.3—derivative term versus rate 116
Chapter 5: Tuning and Control
Series D8 User’s Guide
116
Watlow Anafaze
Doc. 0600-3120-2000
Table 5.2
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 sec-
onds. Some other products use a derivative term called rate
programmed in minutes. Use the table or the formula to con-
vert parameters from one form to the other. Table 5.3 shows
derivative versus rate. Rate = Derivative/60.
Table 5.3
Derivative Term Versus Rate
As a general rule, set the derivative to 15 percent 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.
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