Samson S2000 Instruções de Operação descarregar pdf (Página 48)

Actuator stem retracts FE (AIR TO CLOSE)

Fail-open (for globe and angle valves):

For tight-closing valves, the maximum signal

pressure pst

max

is roughly estimated as fol

-

lows:

pst

max

= F +

d p

A

2

4

⋅ ⋅

⋅

π ∆

[bar]

d = Seat diameter [cm]

∆

p = Differential pressure across the valve

[bar]

A = Actuator diaphragm area [cm²]

If there are no specifications, calculate as

follows:

Required supply pressure =

Upper bench range value + 1 bar.

5.1.3 Signal pressure (output)

The signal pressure at the output (Out-

put 38) of the positioner can be limited to

1.4, 2.4 or 3.7 bar in Code 16.

The limitation is not activated [OFF] by de

-

fault.

5.2 Electrical connections

DANGER!

Risk of electric shock and/or

the formation of an explosive

atmosphere!

–

For electrical installation, observe the rel

-

evant electrotechnical regulations and

the accident prevention regulations that

apply in the country of use.

–

The following regulations apply to

mounting and installation in hazardous

areas: EN 60079-14: 2008 Explosive

atmospheres – Part 14: Electrical instal

-

lations design, selection and erection (or

VDE 0165 Part 1).

NOTICE

– Adhere to the terminal assignment!

Switching the assignment of the electrical

terminals may cause the explosion pro-

tection to become ineffective!

–

Do not loosen enameled screws in or on

the housing.

–

The maximum permissible values speci

-

fied in the national EC type examination

certificates apply when interconnecting

intrinsically safe electrical equipment (U

i

or U

o

; I

i

or I

o

; P

i

or P

o

; C

i

or C

o

, and L

i

or

L

o

).

Selecting cables and wires:

Observe Clause 12 of EN 60079-14: 2008

when installing intrinsically safe circuits. The

Subclause 12.2.2.7 applies when running

multi-core cables containing more than one

intrinsically safe circuit.

48 EB 8384-4 EN

Connections

1 2 ... 43 44 45 46 47 48 49 50 51 52 53 ... 123 124

Comentários a estes Manuais

Sem comentários