Actuator stem extends FA
(air to open)
Fail-safe position "Valve closed"
(for globe and angle valves):
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 + d
p
A
2
4
× ×
×
p D
[bar]
d = Seat diameter [cm]
D
p = Differential pressure across the valve
[bar]
A
= Actuator diaphragm area [cm²]
F = Upper bench range value [bar]
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 (Output
38) of the positioner can be limited in steps
of 0.1 bar to a pressure between 1.4 and
7.0 bar in
Code 16
.
The limitations is not activated [7.0 bar] by
default.
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.
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:
For installing intrinsically safe circuits, ob-
serve
Paragraph 12 in EN 60079-14: 2008
(VDE 0165 Part 1)
.
To install and select cables and wires as well
as to run several intrinsically safe circuits in
one multi-core cable, observe the installation
regulations valid in the country of use. The
diameter of an individual wire in a
fine-stranded conductor must not be smaller
than 0.1 mm. Protect the conductor ends
against splicing, e.g. by using wire-end fer-
rules.
When two separate cables are used for con-
46
EB 8384-6 EN
Connections
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