Samson 1400 Instructions d'exploitation télécharger pdf (Page 13)

3.6 Additional equipment

Inductive limit switch

In the version with inductive limit switch, the

rotary shaft of the positioner carries an ad

-

justable tag which actuates the installed

proximity switch. The optional inductive limit

switch (11) is connected to A1, while the re

-

maining software limit switch is connected to

A2.

Solenoid valve

If the operating voltage for the solenoid

valve (12) falls under 12 V, the supply pres-

sure for the i/p converter (6) is vented to the

atmosphere. The positioner can no longer

operate and the control valve moves to the

fail-safe position determined by the actua-

tor, independent of the reference variable.

In manual mode, the manual set point is

reset to 0 %. A different manual set point

must entered again.

Forced venting

If the voltage signal at terminals +81/–82

falls below 12 V, the i/p converter (6) is

de-energized. The positioner vents the actu

-

ator, causing valve to move to the fail-safe

position determined by the actuator, inde

-

pendent of the reference variable.

Analog position transmitter

The position transmitter (13) is a two-wire

transmitter and issues the travel sensor sig

-

nal as a 4 to 20 mA signal processed by the

microcontroller. Since this signal is issued in

-

dependent of the positioner’s input signal,

the momentary travel/angle of rotation is

controlled in real-time. Additionally, the po

-

sition transmitter allows positioner faults to

be indicated over a signal current of

< 2.4 mA or > 21.6 mA.

Leakage sensor

By upgrading the positioner with a leakage

sensor, it is possible to detect seat leakage

when the valve is in the closed position. For

more details, refer to the Operating Instruc

-

tions EB 8389-1 EN on EXPERTplus Valve

Diagnostics.

Binary input

The optional binary input can be configured:

4

To connect a floating contact

4

To connect a non-floating contact (0 to

24 V DC)

By selecting a certain function, one of the

following actions can be activated:

4

Transmit switching state

The switching state of the binary input is

logged.

4

Activate local write protection

After the first initialization, a local write

protection can be activated. While the

binary input is active, no settings can be

changed at the positioner. The positioner

cannot be re-initialized. Configuration

enabling over Code 3 is not active ( ).

4

Start PST

The positioner start a single partial stroke

test. The test is performed with the set

-

tings in Code 49 - d2 to Code 49 - d9

(refer to Operating Instructions

EB 8389-1 EN on EXPERTplus Valve Di

-

agnostics).

4

Move valve to safety set point

An on/off valve moves to the predeter

-

EB 8384-6 EN 13

Design and principle of operation

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