Power Supply - Emerson Rosemount 2051 Quick Start Manual

September 2016
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.
6.1 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.
1. Remove the field terminals housing cover.
2. Connect the wiring pair and ground as indicated in
a. Trim the cable shield as short as practical and insulate from touching the
transmitter housing.
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.
b. Continuously connect the cable shields to the power supply ground.
c. Connect the cable shields for the entire segment to a single good earth
ground at the power supply.
Note
Improper grounding is the most frequent cause of poor segment communications.
3. Replace the housing cover. It is recommended that the cover be tightened
until there is no gap between the cover and the housing.
4. Plug and seal unused conduit connections.

6.2 Power supply

The transmitter requires between 9 and 32 Vdc (9 and 30 Vdc for intrinsic safety,
and 9 and 17.5 Vdc for FISCO intrinsic safety) to operate and provide complete
functionality.
Quick Start Guide
Figure 8.
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