Flowserve 1400 Valtek Logix User Manual
Page 3
46-3
Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
Specifications
Electrical Specifications
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NI Configurator Software Specifications
Positioner Specifications
Physical Specifications
Hazardous Area Certifications
CE Mark Qualifications
Positioner Operation
The Logix 1400 positioner is an electric feedback instru-
ment. Figure 1 shows a Logix 1400 positioner installed on
a double-acting actuator for air-to-open action. Position-
ing is based on a balance of two signals: one proportional
to the command input signal and the other proportional to
the valve stem position.
The supply pressure for the positioner pressure modula-
tor is tapped off the main supply and is filtered as it
passes through a field-replaceable, coalescing filter
element in the module. This air passes through an
internal pressure regulator that regulates it to approxi-
mately 22 psig. The air then passes through an orifice
that restricts the flow and air consumption.
The pressure modulator further controls the air from 6-12
psig, using a spring-diaphragm flapper that is attracted
by an electromagnet to a nozzle. A temperature compen-
sated hall effect sensor mounted on a circuit board
senses the spool valve position. The hall effect sensor
and circuitry create an inner feedback loop, which deter-
mines how much current to send to the electromagnet for
a desired spool valve position. The electromagnet in the
feedback loop varies the nozzle-flapper spacing, which
regulates the output pressure between 6 and 12 psig,
proportional to the digital positioning algorithm.
When the command and stem position signals are equal,
the system will be in equilibrium and the valve stem will
be in the position called for by the command signal. If
these opposing signals are not equal, the spool valve will
move up (or down) and, by means of the pressure
modulator, change the output pressures and flow rate.
This will cause the actuator piston to move until the
signal of the position sensor equalizes with the
command signal.