Siemens Sitrans LR460 Kurzanleitung Seite 8

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
LR 460
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).
6. Replace the enclosure cover and hand tighten it. The sealing ring must be clean and
undamaged.
7. Tighten the screw on the cover lock.
8. Connect the external earth terminal located between the cable glands to a ground
connection at your vessel. Use a cable with a cross-section of 2.5 mm
Page EN-6
earth
terminal
1 2
L L
1 2
N
Typical PLC/mA configuration with HART
PLC with mA
input card
Ω
R = 250
resistor may be required if the loop resistance is less than 250
Ohms.
on the metal bracket inside
SITRANS LR 460 – QUICK START MANUAL
DC 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
HART
Communicator
375
earth
terminal
1 2
19-30 V
PC/laptop with
HART modem
running PDM
cable
glands
earth
(ground)
terminal
2
or greater.
7ML19985QW81