Flowserve Logix 3200MD - Detailed Operational Sequence

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Figure 2: Sys
t
The inner-loo
p
means of a d
r
temperature-
c
valve pressur
e
modulator co
n
means of a pi
e
in response t
o
electronics.
A
the piezo bea
m
the pressure
u
pressure und
e
spool valve m
sensor trans
m
loop electroni
c
4.3 Deta
i
Ope
r
A more detail
e
Assume the u
 Unit is in
A
 Custom c
h
characteri
z
 No soft li
m
 Valve has
12 mA.
 Loop cali
b
command
.
 Actuator i
s
open.
Given these
c
source of 50
p
so the Comm
a
Command. S
is also at 50
p
the spool val
v
the pressures
This is comm
o
t
em Positionin
g
p
controls the
p
r
iver module.
T
c
ompensated
h
e
modulator.
T
n
trols the air p
r
e
zo beam ben
d
o
an applied v
o
A
s the voltage
t
m
bends, closi
u
nder the diap
h
e
r the diaphra
g
oves up or do
w
m
its the positio
n
c
s for control
p
i
led Seque
n
r
ations
e
d example ex
nit is configur
e
A
nalog comma
n
h
aracterization
z
ation is Linea
r
m
its enabled.
N
zero deviation
b
ration: 4 mA =
.
s
tubed and po
c
onditions, 12
m
p
ercent. Cust
o
a
nd source is
p
ince zero devi
a
p
ercent. With t
h
v
e will be at a
m
above and be
o
nly called the
g
Algorithm
p
osition of the
s
T
he driver mod
h
all effect sens
o
T
he piezo valv
e
essure under
a
d
er. The piez
o
o
ltage from the
t
o the piezo va
l
ng off against
a
h
ragm to incre
a
g
m increases o
w
n respectivel
y
n
of the spool
b
p
urposes.
n
ce of Posi
plains the con
t
e
d as follows:
n
d source.
is disabled (th
r
).
N
o MPC set.
with a presen
t
0 % comman
d
s
itioner is con
f
m
A represents
o
m characteriz
a
p
assed 1.1 to t
h
a
tion exists, th
e
h
e stem at the
m
iddle position
l
ow the piston
null or balanc
e
Us
e
s
pool valve by
ule consists o
f
o
r and a piezo
e
pressure
a
diaphragm b
y
o
beam deflect
s
inner-loop
l
ve increases,
a
nozzle causi
n
a
se. As the
r decreases, t
h
y
. The hall eff
e
b
ack to the inn
e
tioner
t
rol function.
erefore
t
input signal o
f
d
, 20 mA = 10
0
f
igured air-to-
a Command
a
tion is disable
h
e Control
e
Stem Positio
desired positi
o
that balances
in the actuator
e
d spool positi
o
e
r instructions
f
a
y
s
n
g
h
e
e
ct
e
r-
f
0
%
d
n
o
n,
.
o
n.
Assum
e
The po
s
percen
t
becom
e
Control
50 % =
positio
n
sends
a
positio
n
to the
b
top of t
h
the ste
m
75 per
c
decrea
s
openin
g
zero.
A
balanc
e
desire
d
One im
point: I
n
called I
algorit
h
balanc
e
zero s
p
offset.
that m
u
a null p
import
a
autom
a
– Digital Posit
i
e
the input sig
n
s
itioner sees t
h
t
. Linear char
a
e
s 75 percent.
Command an
+25 %, wher
e
n
. With this po
a
signal to mo
v
n
. As the spo
o
b
ottom of the a
c
h
e actuator. T
m
to start movi
c
ent. As the st
e
s
e. The contr
o
g
. This proce
s
A
t this point, th
e
e
d position. S
t
d
stem position
m
portant param
e
n
ner loop offs
e
I
nner loop offs
e
h
m. In order fo
e
d position, th
e
p
ool command.
The value of t
h
u
st be sent to t
h
p
osition with ze
a
nt for proper
c
a
tically during
s
i
oner 3200MD
n
al changes fr
o
h
is as a Com
m
a
cterization, th
e
Deviation is t
h
d Stem Positi
o
e
50 percent is
sitive deviatio
n
v
e the spool u
p
o
l moves up, th
e
ctuator and ai
r
T
his new press
u
i
ng towards th
e
em moves, th
e
o
l algorithm be
g
s
s continues u
n
e
spool will be
t
em movemen
t
is now achiev
e
eter has not b
e
e
t. Referring t
o
e
t is added to t
r the spool to
r
e
control algori
t
This is the p
u
h
is number is
e
h
e spool positi
o
ro deviation.
T
c
ontrol and is o
s
troke calibrati
o
LGENIM005
9
o
m 12 mA to 1
6
m
and source of
e
Control Com
m
h
e difference
b
o
n: Deviation =
the present st
e
n
, the control a
p
from its pres
e
e
supply air is
r
is exhausted
f
u
re differential
e
desired posit
i
e
Deviation be
g
g
ins to reduce
n
til the Deviati
o
back in its null
t
will stop and
t
e
d.
e
en discussed
o
Figure 2, a n
u
he output of th
r
emain in its n
u
t
hm must outp
u
u
rpose of the I
n
e
quivalent to t
h
o
n control to b
r
T
his paramete
r
ptimized and
s
o
n.
9
-04 09/11
7
6
mA.
75
m
and
b
etween
75 % -
e
m
lgorithm
e
nt
applied
f
rom the
causes
i
on of
g
ins to
the spool
o
n goes to
or
t
he
to this
u
mber
e control
u
ll or
u
t a non-
n
ner loop
h
e signal
r
ing it to
r
is
s
et