Actuator stem retracts (FE):
Fail-safe position "Valve OPEN"
(for globe and angle valves)
The required supply pressure for a
tight-closing valve is roughly estimated from
the maximum signal pressure pst
max
:
pst
max
= F +
dp
A
² ××
×
pD
4
[bar]
d = Seat diameter [cm]
D
p = Differential pressure at the valve [bar]
A = Actuator diaphragm area [cm²]
F = Upper range value of the actuator
In the absence of such specifications, pro-
ceed as follows:
Required supply pressure =
Upper bench range value + 1 bar
Pressure regulator
After tilting the cover plate back, the pres-
sure regulator (9) can be continuously ad-
justed. When the adjuster is turned counter
-
clockwise as far as it will go, signal pres
-
sures for spring ranges up to 2.5 bar are
controlled. When the adjuster is turned
clockwise all the way, signal pressures for
spring ranges up to 6.0 bar are controlled.
If the signal pressure must not exceed a cer
-
tain value, this limit can be adjusted using a
pressure gauge (accessories).
3.2 Electrical connections
DANGER!
Risk of electric shock and/or the
formation of an explosive atmo
-
sphere!
–
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
).
Depending on the version use, the positioner
is equipped with inductive limit switches
and/or a solenoid valve.
Versions with position transmitter do not
permit the connection of this additional
equipment.
EB 8355-1 EN 29
Connections
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