C. Power/configuration terminals
Prerequisites
An external power supply is required to operate the transmitter.
Procedure
1. Remove the terminal block cover (if applicable).
2. Connect the power leads to the terminals.
a) Connect the positive power lead to the "+" terminal.
b) Connect the negative power lead to the "-" terminal.
3. Tighten the terminal screws.
When tightening the sensor and power wires, the max torque is 6 in-
lbs. (0.7 N-m).
4. Reattach and tighten the cover (if applicable).
5. Apply power (12–42 Vdc).
5.3 Load limitation
The power required across the transmitter power terminals is 12 to 42.4
Vdc; the power terminals are rated to 42.4 Vdc.
NOTICE
To prevent damaging the transmitter, do not allow terminal voltage to drop
below 12.0 Vdc when changing the configuration parameters.
5.4
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).
5.4.1 Ground the transmitter: option 1
Procedure
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.
Quick Start Guide April 2019
20 Rosemount 644H and 644R
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