Power Supply; Power Conditioner; Shield Wire Ground - Emerson Rosemount 3051 Series Quick Start Manual

February 2019
5. Be connected to a good earth ground at the power supply end.
Figure 4-3: Wiring
6. Replace the housing cover. It is recommended the cover be tightened
until there is no gap between the cover and the housing.
7. Plug and seal unused conduit connections.

4.1.1 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.

4.1.2 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.
4.1.3 Grounding
Signal wiring of the Fieldbus segment cannot be grounded. Grounding out
one of the signal wires will shut down the entire Fieldbus segment.

4.1.4 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
E
D
A. Minimize distance
B. Trim shield and insulate
C. Ground for transient protection
D. Connect shield back to the power supply ground
E. Insulate shield
B
A
DP
A
Quick Start Guide
C
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