SMAR fy303, Operation, Maintenance & Instruction Manual

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Installation
1.7
The
FY303 is powered via the bus. The limit for such devices is according to the DP/PA coupler
limitations for one bus for non-intrinsically safe requirement. In hazardous area, the number of
devices may be limited by intrinsically safe restrictions, according to the coupler DP/PA and barriers
limitations.
WARNING
HAZARDOUS AREAS
In hazardous areas with explosion proof requirements, the covers must be tightened with at least 8 turns. In
order to avoid the penetration moisture or corrosive gases, tighten the O’ring until feeling the O'ring touching
the housing. Then, tighten more 1/3 turn (120
°
) to guarantee the sealing. Lock the covers using the locking
screw.
In hazardous zones with intrinsically safe or non-incentive requirements, the circuit entity parameters and
applicable installation procedures must be observed.
Cable access to wiring connections is obtained by 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.
Should other certifications be necessary, refer to the certification or specific standard for installation
limitations.
The Figure 1.6 - 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.
WIRES
CORRECT INCORRECT
Figure 1.6 - Conduit Installation Diagram
The
FY303 is protected against reverse polarity, and can withstand
±
35 Vdc without damage, but it
will not operate when in reverse polarity.
Topology and Network Configuration
Bus topology (See Figure 1.7)
and tree topology (See Figure 1.8) 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 Fieldbus should not exceed
1900m.
The connection of couplers should be kept less than 15 per 250m. In following figures the
DP/PA link depends on the application needs.