Step 4: Connect The Wiring And Power Up - Emerson Rosemount 2051CF Series Quick Installation Manual

Rosemount 2051
S 4: C
TEP ONNECT THE
Use of ordinary copper wire of sufficient size to
ensure that the voltage across the transmitter
power terminals does not drop below 9 vdc. To
power the transmitter, connect the power leads to
the terminals indicated on the terminal block label.
The power terminals are polarity insensitive, which
means the electrical polarity of the power leads
does not matter when connecting to the power
terminals. When wiring to the screw terminals, the
use of crimped legs is recommended. Tighten the
terminal screws to ensure adequate contact. No
additional power is needed.
Power Supply
The transmitter requires between 9 and 32 V dc (9 and 15 V dc for FISCO) to operate and
provide complete functionality.
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.
Grounding
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 is typically at the power supply.
It is important that the instrument cable shield:
• be trimmed close and insulated from touching the transmitter housing
• be connected to the next shield if cable is routed through a junction box
• be connected to a good earth ground at the power supply end
8
W
IRING AND
Quick Installation Guide
00825-0200-4101, Rev EA
P U
OWER P
Power
Terminals
June 2010
Ground
Terminal