GMC-I Messtechnik GmbH
R2500–34
Evaluating the Start-Up Test
– Apply a tangent to the curve at the intersection of the actual value and the setpoint, or the cut-off point of the output.
– Measure time
t
.
– Measure oscillation amplitude
x
ss
, or for step-action controllers overshooting
x
.
If manipulating factor limiting was active, the proportional band must be corrected:
Y H
positive:
Pb I
multiply by 100%
/
Y H
Y H
negative:
Pb II
multiply by -100%
/
Y H
Parameter Value
tu
1.5
t
t – (
tY
/ 4)
tc
tu
/ 12
tY
/ 100
Pb I
x
ss
2
x
ss
x / 2
Pb II
–
Pb I
(T
I
/ T
II
)
–
Pb I
(T
I
/ T
II
)
–
Parameter
2-step controller
3-step controller
Cont.-action controller
Split range controller
Step-action controller
P
t
x
x
ss
T
I
T
II
dbnd
=
0
dbnd
=
MRS
(3-step and split range controllers only)
Содержание R2500
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