Samson 3730 Series Mounting And Operating Instructions page 81

according to EN 60079-15, circuits may be
connected, interrupted or switched while en-
ergized only during installation, mainte-
nance or repair.
The special conditions of use mentioned in
the statement of conformity must be ob-
served for the rated values and the installa-
tion of the series-connected fuse for intercon-
nection of Ex nA circuits.
For Ex nA equipment (non-sparking equip-
ment), circuits may be connected, interrupted
or switched while energized only during in-
stallation, maintenance or repair.
− Positioners with type of protection Ex nA
or Ex tc can be used with a cover with or
without window.
− The Type 3730-31, Type 3730-35 and
Type 3730-38 Positioners are 100 %
identical in design, except for the mark-
ing and the housing cover.
− For type of protection Ex nA, the VCC
connection in the interface adapter must
be connected in series with a fuse ac-
cording to IEC 60127, 250 V F or T with
a fuse rating of I
− The signal current circuit must be con-
nected in series with a fuse according to
IEC 60127-2/VI, 250 V T with a fuse
rating of I ≤63 mA.
N
− The transmitter current circuit must be
connected in series with a fuse according
to IEC 60127-2/VI, 250 V T with a fuse
rating of I ≤40 mA.
N
The fuses must be installed outside the haz-
ardous area.
EB 8384-3 EN
≤40 mA.
N
Cable entry
Cable entry with M20x1.5 cable gland, 6 to
12 mm clamping range (see accessories in
Table 5-4).
There is a second M20x1.5 threaded hole in
the housing that can be used for additional
connection, when required. The screw termi-
nals are designed for wire cross-sections of
0.2 to 2.5 mm². Tighten the screws by 0.5 to
0.6 Nm.
The wires for the set point must be connected
to the terminals 11 and 12 located in the
housing.
Only use a current source. OVERLOAD ap-
pears on the display when the set point ex-
ceeds 22 mA.
NOTICE
!
The connection of a voltage source (U ≥ 7 V
or U ≥ 2 V when connected to the wrong
pole) at terminals 11 and 12 will damage
the positioner.
Î Only connect a voltage source and never
a current source.
In general, it is not necessary to connect the
device to a bonding conductor. However, if it
is to be connected, it can be connected ei-
ther to the terminal for equipotential bonding
inside or outside the device.
Depending on the version, the positioner is
equipped with inductive limit switches and/
or a solenoid valve.
The position transmitter is operated on a
two-wire circuit. The usual supply voltage to
terminals 31 and 32 is 24 V DC. Taking the
Installation
5-43