Signal Pressure (Output); Electrical Connections - Samson 3730-5 Mounting And Operating Instructions

Connections
The bench range is written on the nameplate ei-
ther as the spring range or signal pressure
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, at least 1.4 bar.
Actuator stem retracts FE (AIR TO CLOSE)
Fail-open (for globe and angle valves):
For tight-closing valves, the maximum signal
pressure pstmax is roughly estimated as fol-
lows:
d² · π · ∆p
F +
pst =
max
d = Seat diameter [cm]
∆p = Differential pressure across the valve [bar]
A = Actuator diaphragm area [cm²]
F = Upper bench range value of the actuator [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 (38) of the
positioner can be restricted to 1.4 bar,
2.4 bar or 3.7 bar in Code 16.
The limitation is not activated [No] by de-
fault.
54
[bar]
4 · A

5.2 Electrical connections

DANGER!
Risk of electric shock and/or the for-
mation of an explosive atmosphere.
For electrical installation, observe the
relevant electrotechnical regulations
and the accident prevention regula-
tions that apply in the country of use.
In Germany, these are the VDE regu-
lations and the accident prevention
regulations of the employers' liability
insurance.
The following regulations apply to in-
stallation in hazardous areas:
EN 60079-14: 2008 (VDE 0165,
Part 1) Explosive Atmospheres –
Electrical Installations Design, Selec-
tion and Erection.
WARNING!
Incorrect electrical connection will
render the explosion protection un-
safe.
Adhere to the terminal assignment.
Do not undo the enameled screws in
or on the housing.
Do not exceed the maximum permis-
sible values specified in the EC type
examination certificates when inter-
connecting intrinsically safe electrical
equipment (U
C or C and L
i 0
or U , l or I , P or P
i 0 i 0 i
or L ).
i 0
EB 8384-5 EN
,
0