Wire And Apply Power - Emerson Rosemount 644H Quick Start Manual

Quick Start Guide
2

Wire and apply power

Wiring diagrams are located inside the terminal block cover.
An external power supply is required to power a Fieldbus segment.
The power required across the transmitter power terminals is 9 to 32 Vdc
(the power terminals are rated to 32 Vdc). To prevent damaging the
transmitter, do not allow terminal voltage to drop below 9 Vdc when
changing the configuration parameters.
2.1 Power filter
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.
2.2 Power the transmitter
Procedure
1. Remove the terminal block cover (if applicable).
2. Connect the power lead to the power terminals.
The Rosemount
insensitive.
If a transient protector is being used, the power leads will now be
connected to the top of the transient protector unit.
3. Tighten the terminal screws.
When tightening the sensor and power wires, the max torque is 6 in-
lb. (0.7 N-m).
4. Reattach and tighten the cover (if applicable).
5. Apply power (9–32 Vdc).
8
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644H with F
OUNDATION
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Fieldbus is polarity
Rosemount 644H
April 2019