Siemens LR 460 User Manual
7ML19985JM01
SITRANS LR 460 – INSTRUCTION MANUAL
Page 21
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4.
Tighten the cable gland and check the strain relief (pull and turn).
5.
Replace the enclosure cover and hand tighten it. The sealing ring must be clean and
undamaged.
6.
Tighten the screw on the cover lock.
7.
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
connection at your vessel. Use a cable with
a cross-section of 2.5 mm
2
or greater.
PROFIBUS wiring
Power Demands
To determine how many devices can be connected to a bus line, calculate the combined
maximum current consumption of all the connected devices: 10.5 mA for SITRANS LR 460.
Allow a current reserve for safety.
maximum current consumption of all the connected devices: 10.5 mA for SITRANS LR 460.
Allow a current reserve for safety.
Bus Termination
PROFIBUS PA MUST be terminated at both extreme ends of the cable for it to work
properly. Please refer to the PROFIBUS PA User and Installation Guidelines (order
number 2.092), available from www.profibus.com.
properly. Please refer to the PROFIBUS PA User and Installation Guidelines (order
number 2.092), available from www.profibus.com.
Install in accordance with
PROFIBUS PA User and Installation Guidelines
(order number
2.092), available from www.profibus.com.
Note:
PROFIBUS PA is not polarity-sensitive.
cable
glands
earth
(ground)
terminal
1 2
6
4 5
3
7 8
PROFI-
BUS PA
BUS PA
19-30 V
Rated temperature of
connection cables must
exceed maximum ambient
temperature by at least 15 K
connection cables must
exceed maximum ambient
temperature by at least 15 K
DC version
earth
terminal
cable clamp
1 2
6
4 5
3
7 8
L
1
L
2
N
Rated temperature of
connection cables must
exceed maximum ambient
temperature by at least 15 K
connection cables must
exceed maximum ambient
temperature by at least 15 K
PROFI-
BUS PA
BUS PA
AC version
earth
terminal
cable clamp