A5E32007360
SITRANS LR460 – QUICK START MANUAL
Page EN-7
m
mmmm
Englis
h
SITRANS LR460 HART wiring
(continued from
Connecting SITRANS LR460
on page 6)
Install in accordance with
Wiring and Installation
in the HART Application Guide (order number
HCF_LIT-34), available from: http://www.hartcomm.org/technical/doclist.html.
Connecting HART
4. Connect the earth conductor of the power supply to
the earth terminal
on the metal bracket inside
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).
Note:
LR460 HART requires no power from the 4-20 mA loop.
AC version
earth
terminal
cable clamp
DC version
earth
terminal
cable clamp
PLC with mA
input card
PC/laptop with
HART modem
running PDM
LR460
R
= 250
HART
Communicator
375
Notes:
• For error-free communication via the HART protocol, a 250 Ohm
resistor may be required if the loop resistance is less than
250 Ohms.
• Only one HART communication device should be inserted in the loop.
Typical PLC/mA configuration with HART
cable
glands
earth
(ground)
terminal