Ground The Transmitter - Emerson Rosemount 644H Quick Start Manual

Quick Start Guide
Note
• Each segment in a PROFIBUS trunk must be terminated at both ends.
• Some DP/PA couplers contain the power supply, one terminator, and the power conditioner
within the coupling device.
• The configuration tool is typically located in the control room.

2.3 Ground the transmitter

Ungrounded thermocouple, mV, and RTD/ohm inputs
Each process installation has different requirements for grounding. Use the
grounding options recommended by the facility for the specific sensor type, or
begin with grounding Option 1 (the most common).
Option 1
1. Connect sensor wiring shield to the transmitter housing.
2. Ensure the sensor shield is electrically isolated from surrounding fixtures that
may be grounded.
3. Ground signal wiring shield at the power supply end.
A. Transmitter
B. Sensor wires
Option 2
1. Connect signal wiring shield to the sensor wiring shield.
2. Ensure the two shields are tied together and electrically isolated from the
transmitter housing.
3. Ground shield at the power supply end only.
4. Ensure that the sensor shield is electrically isolated from the surrounding
grounded fixtures.
A
A.Transmitter
B.Sensor wires
6
A
B
D
C. PROFIBUS loop
D. Shield ground point
B
C
D
C
D
C. PROFIBUS loop
D. Shield ground point
January 2016