Emerson Rosemount Reference Manual page 32

Section 2: Installation
April 2014
Power/current loop connections
Use copper wire of a sufficient size to ensure that the voltage across the transmitter power
terminals does not go below 12.0 Vdc.
1.
2.
3.
For information about multichannel installations, refer to
Note
Do not connect the power/signal wiring to the test terminal. The voltage present on the
power/signal leads may burn out the reverse-polarity protection diode built into the test
terminal. If the test terminal's reverse polarity protection diode is burned out by the incorrect
power/signal wiring, the transmitter can still be operated by jumping the current from the test
terminal to the "–" terminal. See
the terminal.
Figure 2-11. Connecting a Field Communicator to a Transmitter Loop (HART/ 4–20 mA).
Power/Signal terminals
22
Connect the current signal leads as shown in
Recheck the polarity and connections.
Turn the power ON.
or*
AMS Device Manager software or a Field Communicator can be connected at any
termination point in the signal loop. The signal loop must have between 250 and 1100
ohms load for communications.
Figure
page
"Test terminal (HART / 4–20 mA only)" on page 176
The signal wire may be grounded at any
point or left ungrounded.
 
250 R 1100
L
Reference Manual
00809-0100-4021, Rev GC
2-11.
20.
Power
supply
Installation
for use of