Siemens sitrans LR460 Schnellstartanleitung Seite 9

SITRANS LR460 HART wiring
Connecting SITRANS LR460
(continued from
LR460 HART requires no power from the 4-20 mA loop.
Note:
Install in accordance with
HCF_LIT-34), available from: http://www.hartcomm.org/technical/doclist.html.
AC version
cable clamp
Connecting HART
LR460
Notes:
• For error-free communication via the HART protocol, a 250 Ohm
• Only one HART communication device should be inserted in the loop.
4. Connect the earth conductor of the power supply to
the earth terminal
the enclosure. Adjust the cable length so that the
earth conductor would be last to disconnect if cable
is pulled.
5. Tighten the cable gland and check the strain relief
(pull and turn).
7ML19985QW82
on page 6)
Wiring and Installation
DC version
earth
terminal
Typical PLC/mA configuration with HART
PLC with mA
input card
Ω
R = 250
Communicator
375
resistor may be required if the loop resistance is less than
250 Ohms.
on the metal bracket inside
SITRANS LR460 – QUICK START MANUAL
in the HART Application Guide (order number
cable clamp
PC/laptop with
HART modem
running PDM
HART
earth
terminal
cable
glands
earth
(ground)
terminal
Page EN-7