Flowserve Logix 3200MD - Positioner Operation Principles

6
4.2 Posi
t
The Logix 32
0
instrument. F
installed on a
action.
The Logix 320
mA input sign
a
communicatio
n
signal: Analog
signal is used
f
level of the in
p
sent via HAR
T
command sou
the HART 375
Whether in A
n
as the valve c
l
the valve ope
n
signal is conv
e
the signals co
r
The input sig
n
characterizati
o
longer uses
C
characterize t
h
done in softw
a
adjustment.
T
Equal Percen
t
Figure 1: Log
i
t
ioner Oper
0
0MD position
e
igure 1 shows
double-acting
0MD receives
p
a
l. However, si
n
n
s, two source
s
and Digital. In
f
or the comma
n
ut 4-20 mA sig
n
T
, is used as th
e
rce can be acc
e
communicator
,
n
alog or Digital
l
osed position
a
n
position. In
A
e
rted to a perc
e
r
responding to
n
al in percent
p
o
n/limits modif
i
C
AMs or other
m
h
e output of th
e
a
re, which allo
w
T
he positioner
h
t
(= %) and C
u
i
x 3200MD Di
g
ation
e
r is an electri
c
a Logix 3200
M
linear actuator
p
ower from the
t
n
ce this positio
n
s
can be used f
o
Analog source
,
n
d source. In D
n
al is ignored a
n
e
command sou
e
ssed with Val
v
,
or other host
s
S
ource, 0 % is
a
nd 100 % is al
A
nalog source,
t
e
ntage. During
0 % and 100
%
p
asses through
i
er block. The
m
echanical m
e
e
positioner.
T
w
s for in-the-fi
e
h
as three basi
c
u
stom characte
ital Positioner
S
Us
e
c
feedback
M
D positioner
for air-to-ope
n
t
wo-wire, 4-20
n
er utilizes HA
R
o
r the comman
d
the 4-20 mA
igital source, th
n
d a digital sig
n
rce. The
v
eSight softwar
e
s
oftware.
always define
d
ways defined
a
t
he 4-20 mA
loop calibratio
n
%
are defined.
a
positioner no
e
ans to
T
his function is
e
ld customer
c
modes: Line
a
rization.
S
chematic (ai
r
-
e
r instructions
–
n
R
T
d
e
n
al,
e
,
d
a
s
n
,
a
r,
In Line
a
to the
c
(= %)
m
rangea
b
enable
d
output
c
curve.
define
d
additio
n
(Minim
u
The ac
t
any ch
a
called t
The Lo
g
algorit
h
control
again t
o
measu
r
Comm
a
deviati
o
inner-l
o
upon t
h
spool p
stem b
e
deviati
o
This pr
o
r
-
to-open confi
g
–
Digital Positi
o
a
r mode, the i
n
c
ontrol algorith
m
m
ode, the inpu
t
bility = % curv
e
d
, the input sig
c
urve or a cus
t
The custom u
s
d
using a hand
h
n
, two user-de
f
u
m Position C
u
t
ual command
a
racterization
o
t
he Control Co
m
g
ix 3200MD u
s
h
m. The two s
t
and an outer-l
o
o
Figure 1, a s
t
r
ement of the
s
a
nd is compar
e
o
n exists, the
c
o
op control to
m
h
e deviation.
T
p
osition. The a
e
gins to move.
o
n between C
o
o
cess continu
e
g
uration)
o
ner 3200MD
n
put signal is p
a
m
in a 1:1 tran
s
t
signal is map
p
e
. If Custom c
h
nal is mapped
t
om, user-defi
n
s
er-defined 21
-
h
eld or ValveS
f
ined features,
u
toff), may aff
e
being used to
o
r user limits h
a
m
mand.
s
es a two-stag
e
t
ages consist
o
o
op, stem pos
i
t
em position s
e
s
tem moveme
n
e
d against the
c
ontrol algorith
m
m
ove the spool
T
he inner-loop
t
ctuator pressu
The stem m
o
o
ntrol Comma
n
e
s until the de
v
LGENIM0059
-
flows
e
a
ssed straight
s
fer. In Equal
p
ed to a stand
a
h
aracterizatio
n
to either a def
a
n
ed 21-point o
u
-
point output c
u
ight software.
Soft Limits an
d
e
ct the final inp
u
position the st
e
a
ve been eval
u
e
, stem-positi
o
o
f an inner-loo
p
i
tion control.
R
e
nsor provides
n
t. The Contro
Stem Position.
m
sends a sig
n
up or down, d
t
hen quickly a
d
res change an
o
vement reduc
e
n
d and Stem P
o
v
iation goes to
z
-
04 09/11
e
rve.com
through
Percent
a
rd 30:1
n
is
a
ult = %
u
tput
u
rve is
In
d
MPC
u
t signal.
e
m, after
u
ated, is
o
ning
p
, spool
R
eferring
a
l
If any
n
al to the
epending
d
justs the
d the
e
s the
o
sition.
z
ero.