Hart Wiring - Siemens SITRANS LR460 HART Operating Instructions Manual

HART wiring

LR460 HART requires no power from the 4-20 mA loop.
Note:
AC version
cable clamp
3 4 5 6 7 8
Rated temperature of
connection cables must
mA
exceed maximum ambient
temperature by at least 15 K
Connecting HART
Typical PLC/mA configuration with HART
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.
LR460
(Continued from
3. Connect the earth conductor of the power supply to the earth terminal
metal bracket inside the enclosure. Adjust the cable length so that the earth
conductor would be last to disconnect if cable is pulled.
Page 22
earth
terminal
1 2
L L
1 2
N
PLC with mA
input card

R = 250
Connecting SITRANS LR460
SITRANS LR460 – INSTRUCTION MANUAL
DC version
cable clamp
4 5
3 6 7 8
Rated temperature of
connection cables must
mA
exceed maximum ambient
temperature by at least 15 K
HART
Communicator
375
on page 21, step 2.)
earth
terminal
1 2
19-30 V
PC/laptop with
HART modem
running PDM
on the
A5E42035355