Samson 4749, Монтаж и эксплуатация

Страница: 37 / 92

EB 4749 EN 5-15
Installation
Enclosures "d", Clauses 13.1 and 13.2 and
for which a separate test certificate is avail
-
able.
Do not use cable entries and blanking plugs
of simple construction.
Î
Install the connecting cable properly so
that it is protected against mechanical
damage.
Î
If the temperature at the entry parts ex-
ceeds 70 °C, use a temperature-resistant
connecting cable:
– For Ex db T6 only use cables and
cable glands which are suitable for
the temperature range from –55 to
+85 °C.
– For Ex db T5 only use cables and
cable glands which are suitable for
the temperature range from –55 to
+100 °C.
– For Ex db T4 only use cables and
cable glands which are suitable for
the temperature range from –55 to
+105 °C.
Î
Include the enclosure of the position
transmitter in the on-site equipotential
bonding system. Use the external
grounding connection on the enclosure.
Equipment with type of protection Ex t
Opening the position transmitter in
potentially explosive dust atmospheres will
render the explosion protection unsafe.
Î
Do not open the enclosure cover of the
position transmitter in potentially explo-
sive dust atmospheres.
In equipment operated according to type of
protection Ex t (protection by enclosure), cir -
cuits may be connected, interrupted or
switched while energized only during instal -
lation, maintenance or repair.
Î
Certified cable glands and blanking
plugs with appropriate type of protection
with an IP rating ≥ 66 and suitable for
the certified temperature range must be
used.
Î
For Ex tb only use cables and cable
glands which are suitable for the tem-
perature range from –55 to +85 °C.
Connect the electrical supply
1. Strip at least 8 mm insulation off the
signal wires and guide them through the
cable gland.
2. Connect the signal wires to the screw
terminals as shown in Fig. 5-8.
Î
Observe the correct polarity.
WARNING !