
Kurz
B
‐
Series
Operations
Guide
4–58
Program Mode
Advanced Setup
Manually Tuning A PID Loop
To
manually
tune
a
PID
loop:
1>
Place
the
unit
in
manual
control
mode
or
open
loop
control.
2>
Increase
or
decrease
the
4
‐
20
mA
output
from
5
to
10
percent,
and
note
the
flow
response
change.
Then
the
Proportion
Gain
starting
point
is:
2
x
output
change
(engineering
units/flow
response
change)
(this
is
a
unit
less
number)
Note
the
system
response
time
change
(from
0
to
63
percent).
3>
Set
the
Integral
response
time
to
this
number.
4>
Set
the
derivative
time
constant
to
1/6
of
the
integral
time.
5>
Place
the
flow
meter
in
a
closed
loop
or
automatic
operation.
Make
a
small
change
to
the
set
point
and
observe
the
reaction,
as
shown
in
through
6>
Some
flow
meters
require
different
parameters
at
different
operating
points.
Rather
than
resetting
the
parameters
multiple
times,
it
is
recommended
that
you
optimally
tune
the
flow
meter
at
the
normal
flow
rate
and
accept
the
less
‐
than
‐
optimal
response
at
other
flow
rates.
If
the
variation
in
loop
stability
is
too
large
over
normal
operating
flow
ranges,
then
an
advanced
PID
controller
with
variable
gain
settings
is
required
to
overcome
the
limitations
of
the
built
‐
in
flow
controller.
Figure 4
‐
2.
Examples
of
system
responses
‐
Increase
vs.
Decrease
Res
p
onse
Time
Over Damped Response
Increase the proportional gain and
reduce the integral time constant.
Содержание 410FTB
Страница 1: ...Operations Guide for B Series Flow Meters 368042E...
Страница 4: ...Kurz B Series Operations Guide iv...
Страница 9: ...Kurz B Series Operations Guide ix Preface...
Страница 33: ...Kurz B Series Operations Guide 1 20 B Series Flow Meter Modes Menus...
Страница 65: ...Kurz B Series Operations Guide 2 32 B Series Flow Meter Display Mode Options...
Страница 141: ...Kurz B Series Operations Guide 4 68 Program Mode Advanced Setup...
Страница 165: ...Kurz B Series Operations Guide Index 6...