Emerson Rosemount 2051HT Quick Start Manual page 13

November 2019
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.
5. Plug and seal unused conduit connections.
Note
The Rosemount 2051HT polished 316 SST housing only provides
ground termination inside the terminal compartment.
3.5.2 Power supply
The transmitter requires between 9 and 32 Vdc (9 and 30 Vdc for intrinsic
safety) to operate and provide complete functionality.
3.5.3 Power conditioner
A Fieldbus segment requires a power conditioner to isolate the power
supply, filter, and decouple the segment from other segments attached to
the same power supply.
3.5.4 Grounding
Signal wiring of the Fieldbus segment cannot be grounded. Grounding out
one of the signal wires will shut down the entire Fieldbus segment.
3.5.5 Shield wire ground
To protect the Fieldbus segment from noise, grounding techniques for
shield wire require a single grounding point for shield wire to avoid creating
a ground loop. Connect the cable shields for the entire segment to a single
good earth ground at the power supply.
Quick Start Guide
a) Connect the cable shields for the entire segment to a single
good earth ground at the power supply.
a) The covers must only be capable of being released or
removed with the aid of a tool to comply with applicable
ordinary locations requirements.
Quick Start Guide
13