Flowserve 1400 Valtek Logix Instrukcja Użytkownika Pobierz pdf (Strona 3)

46-3Flowserve 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.

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Flowserve 1400 Valtek Logix Instrukcja Użytkownika Strona 3

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