3.6 Setting the Configuration
Chapter 3: Configuration
148
493-0736-11 (6-2)
By determining the four key parameters L, T,
∆
y and
∆
u from a step response,
the three process parameters static gain K
p
, dominant time constant T
p
and dead-
time L
p
can be determined according to the expressions below:
T
p
= T
L
p
= L
Knowing these, the pPI’s parameters can easily be calculated:
T
p
= T
L
p
= L
Example
If the four key parameters are found to have the following values:
∆
y = y1 – y0 = 80 – 20 = 60%
∆
u = u1– u0 = 20 – 10 = 10%
T = t2 – t1 = 60 – 40 = 20 s
L = t1 – t0 = 40 – 20 = 20 s
... then we get ...
T
p
= T = 20 s
L
p
= L = 20 s
... and the controller should be set up according to ...
TI = T
p
= 20 s
K
p
=
∆
y
∆
u
K =
1
K
p
K
p
=
∆
y
∆
u
=
60
10
= 6
K =
1
K
p
=
1
6
≈
0.17
Summary of Contents for ECA06
Page 1: ...Version 1 05 ECA06 60 600 EMA60 Configuration and Installation ...
Page 2: ......
Page 3: ...ECA06 60 600 EMA60 Configuration and Installation ...
Page 10: ...Contents vi 493 0736 11 6 2 ...
Page 16: ...1 5 Version information Chapter 1 Introduction 16 493 0736 11 6 2 ...
Page 200: ...4 2 Annual Check Chapter 4 Maintenance 200 493 0736 11 6 2 ...
Page 286: ...Appendix A Configuration Work Sheets 282 493 0736 11 6 2 ...
Page 304: ...B 1 Total Reset Appendix B Special Modes 298 493 0736 11 6 2 ...
Page 308: ...Index 302 493 0736 11 6 2 ...
Page 309: ......