Actuator stem retracts FE (AIR TO CLOSE)
Fail-safe position "Valve 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 +
dp
A
2
4
⋅⋅
⋅
πΔ
[bar]
d = Seat diameter [cm]
Δ
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. In Germany,
these are the VDE regulations and the
accident prevention regulations of the
employers' liability insurance associa
-
tion.
–
The following standards apply to installa-
tions in hazardous areas: EN 60079-14:
2008 (VDE 0165 Part 1) Explosive at-
mospheres - Electrical installations de-
sign, selection and erection.
NOTICE
–
The terminal assignment must be ad-
hered to. Reversing the assignment of the
electrical terminals may cause the explo
-
sion protection to become ineffective!
–
Do not loosen enameled screws in or on
the housing.
–
For the interconnection of intrinsically
safe electrical equipment, the permissible
maximum values specified in the EC type
examination certificate apply (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
).
EB 8384-5 EN 45
Connections
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