Rosemount 3244MV, Reference Manual

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Reference Manual
00809-0100-4799, Rev BA
September 2002
Model 3244MV
2-7
CONNECT THE WIRING
AND POWER UP
Field Wiring
All power to the transmitter is supplied over the signal wiring. Signal wiring
should be shielded, twisted pair for best results. Do not run unshielded signal
wiring in conduit or open trays with power wiring or near heavy electrical
equipment. Do not remove the transmitter cover in explosive atmospheres
when the circuit is live.
If the sensor is installed in a high-voltage environment and a fault condition or
installation error occurs, the sensor leads and transmitter terminals could
carry lethal voltages. Use extreme caution when making contact with the
leads and terminals.
NOTE
Do not apply high voltage (e.g. ac line voltage) to the transmitter terminals.
Abnormally high voltage can damage the unit. (Sensor and transmitter power
terminals are rated to 42.4 V dc.)
Power Connections
Use ordinary copper wire of sufficient size to ensure that the voltage across the
transmitter power terminals does not drop below 9 V dc. To power the
transmitter, connect the power leads to the terminals marked “+” and “T” as
shown in Figure 2-7. 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 screw terminals, the use of
crimped lugs is recommended. Tighten the terminal screws to ensure
adequate contact. No additional power wiring is needed.
Figure 2-6. Hardware Setup
Figure 2-7. Transmitter Terminal
Block
Front of Coupler
Power
connection
for coupler
L+
L–
P+
Power connection
for segment
Connector to
Siemens Card
installed into PC
P–
Power Terminals
(polarity insensitive)
Ground
Terminal
Sensor Terminals
4-
0
20
0E01
C