Samson 3725 series, Mounting And Operating Instructions

Page: 36 / 68

36 EB 8394 EN
Connections
5.2.1 Electric power supply
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Only use a current source and never a
voltage source!
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Keep the reference variable within the
static destruction limit of ±33 V.
5.2.2 Selecting cables and
wires
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Observe EN 60079-14 and particularly
Clause 12 in it when installing intrinsical
-
ly safe circuits.
The Subclause 12.2.2.7 applies when
running multi-core cables containing
more than one intrinsically safe circuit.
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The minimum radial thickness of the con -
ductor insulation must be suitable for the
conductor diameter and type of insula
-
tion and must not be smaller than
0.2 mm.
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The diameter of an individual wire in a
fine-stranded conductor must not be
smaller than 0.1 mm.
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Strip 8 mm insulation off the wire ends.
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Protect the conductor ends against splic-
ing, e.g. by using wire-end ferrules.
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Cable glands available:
See Table 7 on page 33
5.2.3 Equipment for use in
zone 2
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In equipment operated with type of pro -
tection Ex nA (non-sparking equipment)
according to EN 60079-15, only con
-
nect, isolate or switch circuits while ener -
gized during installation, maintenance or
repair.
5.2.4 Cable entry
The M20x1.5 cable gland is designed for a
clamping range of 6 to 12 mm.
The cage clamp terminals hold wire
cross-sections of 0.2 to 1.5 mm².
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To unlock the cage clamp terminals:
place a slotted screwdriver on the plastic
part (Fig. 15) and lightly push it into the
terminal block.
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Insert or remove the wire without force .
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Guide wires for the reference variable as
shown in Fig. 15.