SMAR FRI303, Инструкция по эксплуатации

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Installation
1.7
WARNING
In hazardous areas with explosion proof requirements, the covers must be tightened at least 8 turns. In order
to avoid the penetration of moisture or corrosive gases, tighten the O-ring until it touches the housing. Then,
tighten 1/3 turn (120°) more to guarantee sealing. Lock the covers using the locking screw.
In hazardous zones with intrinsically safe or non incendive requirements, the circuit entity parameters and
applicable installation procedures must be observed.
Cable access to wiring connections is obtained by one of the two conduit outlets. Conduit threads should be
sealed by means of code-approved sealing methods. The unused outlet connection should be plugged and
sealed accordingly.
Explosion proof, non incendive and intrinsic safety Factory Mutual certification are standard for
FRI303 .
Should other certifications be necessary, refer to the certification or specific standard for installation
limitations.
The Figure 1.10 - Conduit Installation Diagram, shows the correct installation of the conduit, in order
to avoid penetration of water, or other substance, which may cause malfunctioning of the
equipment.
CORRECT
WIRES
INCORRECT
Figure 1.10 - Conduit Installation Diagram
Topology and Network Configuration
Bus topology (See Figure 1.11 - Bus Topology) and tree topology (See Figure 1.12 - Tree Topology)
are supported. Both types have a trunk cable with two terminations. The devices are connected to
the trunk via spurs. The spurs may be integrated in the device giving zero spur length. A spur may
connect more than one device, depending on the length. Active couplers may be used to extend
spur length.
Active repeaters may be used to extend the trunk length.
The total cable length, including spurs, between any two devices in the Profibus-PA should not
exceed 1900 m.