Profibus Wiring - Siemens SITRANS LR460 Operating Instructions Manual

Connection

5.5 PROFIBUS wiring

1. 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.
2. Tighten the cable gland and check the strain relief (pull and turn).
3. Replace the enclosure cover and hand tighten it. The sealing ring must be clean and
undamaged.
4. Tighten the screw on the cover lock.
5. 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
①
②
Full details about HART can be obtained from the HART Communication Foundation at Field
comm group (www.fieldcommgroup.org).
5.5 PROFIBUS wiring
Note
PROFIBUS PA in this device is not polarity-sensitive.
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.
32
Earth (ground) terminal
Cable glands
Compact Operating Instructions, 10/2021, A5E32007360-AB
or greater.
2
SITRANS LR460