Samson 3730 Series Mounting And Operating Instructions page 44

Connections
ment may be switched under normal op-
erating conditions.
– For the interconnection of equipment to
energy-limited circuits with type of pro-
tection EEx nL IIC, the permissible maxi-
mum values specified in the statement of
conformity or the addenda to the state-
ment of conformity apply.
NOTICE
– The terminal assignment specified in the
certificate must be adhered to. Reversing
the assignment of the electrical terminals
may cause the explosion protection to
become ineffective!
Do not tamper with enameled screws in-
side or on the housing.
– Note on the selection of cables and wi-
res: To install intrinsically safe circuits,
observe Paragraph 12 of the standard
EN 60079-14: 2003 (VDE 0165 Part 1).
To run multi-core cables or lines with
more than one intrinsically safe circuit,
Paragraph 12.2.2.7 of this standard ap-
plies.
An additional cable gland can be instal-
led when connecting the device over two
separate cables. Cable entries left un-
used must be sealed with blanking plugs.
Devices used at ambient temperatures
down to –20 °C must have metal cable
entries.
44
EB 8384-3 EN
Cable entries
The cable entry with M20 x 1.5 cable
gland, 6 to 12 mm clamping range.
There is a second M20 x 1.5 threaded bore
in the housing that can be used for addi-
tional connection, when required.
The screw terminals are designed for wire
cross-sections of 0.2 to 2.5 mm². Tighten by
at least 0.5 Nm.
The wires for the reference variable must be
connected to the terminals 11 and 12 lo-
cated in the housing. Only use a current
source!
If the reference variable exceeds 22 mA,
OVERLOAD appears on the LC display to
warn the user.
NOTICE
The wrong connection of a voltage source of
just around 7 V (or around 2 V when con-
nected to the wrong pole) by mistake can
damage the positioner.
In general, it is not necessary to connect the
positioner to a bonding conductor. Should
this be required, however, this conductor
can be connected inside the device.
Depending on the version, the positioner is
equipped with inductive limit switches
and/or a solenoid valve.