Emerson Rosemount 2051CF Quick Start Manual page 19

March 2020
Note
The Rosemount 2051 power terminals are polarity insensitive, which
means the electrical polarity of the power leads does not matter
when connecting to the power terminals. If polarity sensitive devices
are connected to the segment, terminal polarity should be followed.
When wiring to the screw terminals, the use of crimped legs is
recommended.
2. Ensure full contact with terminal block screw and washer. When
using a direct wiring method, wrap wire clockwise to ensure it is in
place when tightening the terminal block screw. No additional power
is needed.
Note
The use of a pin or a ferrule wire terminal is not recommended as the
connection may be more susceptible to loosening over time or under
vibration.
7.1 Signal wiring grounding
Do not run signal wiring in conduit or open trays with power wiring, or near
heavy electrical equipment. Grounding terminations are provided on the
outside of the electronics housing and inside the terminal compartment.
These grounds are used when transient protect terminal blocks are installed
or to fulfill local regulations.
Procedure
1. Remove the field terminals housing cover.
2. Connect the wiring pair and ground as indicated in
Note
Do NOT ground the cable shield at the transmitter; if the cable shield
touches the transmitter housing, it can create ground loops and
interfere with communications.
3. Continuously connect the cable shields to the power supply ground.
Note
Improper grounding is the most frequent cause of poor segment
communications.
4. Replace the housing cover. It is recommended that the cover be
tightened until there is no gap between the cover and the housing.
Quick Start Guide
a) Trim the cable shield as short as practical and insulate from
touching the transmitter housing.
a) Connect the cable shields for the entire segment to a single
good earth ground at the power supply.
Quick Start Guide
Figure 7-1.
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