Samson S2000 Instruções de Operação descarregar pdf (Página 47)

5 Connections

WARNING!

Mount the positioner, keeping the following

sequence:

1. Remove protective film from pneumatic

connections.

2. Mount the positioner on the control valve

3. Connect the supply air

4. Connect the electrical power

5. Perform the start-up settings

The connection of the electrical auxiliary

power may cause the actuator stem to move,

depending on the operating mode.

Do not touch the actuator stem or obstruct it

to avoid risk of injury to hands or fingers.

5.1 Pneumatic connections

NOTICE

Follow the instructions below to avoid dam-

aging the positioner.

–

The threaded connections in the

positioner housing are not designed di

-

rect air connection.

–

The screw glands must be screwed into

the connecting plate, the pressure gauge

mounting block or the connection block

from the accessories.

The air connections are optionally de

-

signed as a bore with ¼ NPT or G ¼

thread.

The customary fittings for metal and cop

-

per pipes or plastic hoses can be used.

–

The supply air must be dry and free from

oil and dust.

The maintenance instructions for upstre

-

am pressure reducing stations must be

observed.

Blow through all air pipes and hoses tho

-

roughly prior to connecting them.

If the positioner is attached directly to the

Type 3277 Actuator, the connection of the

positioner's output pressure to the actuator is

fixed. For attachment according to

IEC 60534-6 (NAMUR), the signal pressure

can be routed to either the top or bottom di

-

aphragm chamber of the actuator, depend

-

ing on the actuator's fail-safe action

"actuator stem extends" or "actuator stem

retracts".

For rotary actuators, the manufacturer's

specifications for connection apply.

5.1.1 Signal pressure gauges

To monitor the supply air (Supply) and sig-

nal pressure (Output), we recommend that

pressure gauges be attached (see accesso-

ries in Tables 1 to 5).

5.1.2 Supply pressure

The required supply air pressure depends on

the bench range and the actuator's operat

-

ing direction (fail-safe action).

The bench range is registered on the name

-

plate either as spring range or signal pres

-

sure range depending on the actuator. The

direction of action is marked FA or FE, or by

a symbol.

Actuator stem extends FA (AIR TO OPEN)

Fail-close (for globe and angle valves):

Required supply pressure = Upper bench

range value + 0.2 bar, minimum 1.4 bar.

EB 8384-4 EN 47

Connections

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