Reference Manual
300520EN, Rev AA
November 2009
3-39
Rosemount 5900 Series
Section 3. Installation
3.4 ELECTRICAL
INSTALLATION
3.4.1
Cable/conduit
entries
The electronics housing has entries for ½ - 14 NPT. Optional M20×1.5,
minifast and eurofast adapters are also available. The connections are made
in accordance with local or plant electrical codes.
Make sure that unused ports are properly sealed to prevent moisture or other
contamination from entering the terminal block compartment of the electronics
housing.
NOTE!
It is recommended that a sealant is used on the cable entry threads to prevent
water from entering the housing interior.
NOTE!
Use the enclosed metal plugs to seal unused ports. The orange plastic plugs
mounted at delivery are not sufficient as seal!
3.4.2
Grounding
The housing should always be grounded in accordance with national and
local electrical codes. Failure to do so may impair the protection provided by
the equipment. The most effective grounding method is direct connection to
earth ground with minimal impedance. There are three grounding screw
connections provided. Two are located inside the Field Terminal side of the
housing and the third is located on the housing. The internal ground screws
are identified by a ground symbol:
.
NOTE!
Grounding the transmitter via threaded conduit connection may not provide
sufficient ground.
Grounding - Foundation Fieldbus
Signal wiring of the fieldbus segment can not be grounded. Grounding out
one of the signal wires will shut down the entire fieldbus segment.
Shield Wire Ground
To protect the fieldbus segment from noise, grounding techniques for shield
wire usually require a single grounding point for shield wire to avoid creating a
ground loop. The ground point shall be located at the power supply.
The
Raptor
devices are designed for “daisy-chain” connection of shield wiring
in order to enable a continuous shield throughout the Tankbus network.
Preliminary
Summary of Contents for Rosemount 5900
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