Siemens LR 460 instruction manual Hart wiring, AC version DC version

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HART wiring

Note: LR 460 HART requires no power from the 4-20 mA loop.

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.

AC version		DC version
cable clamp	earth	cable clamp	earth
	terminal		terminal

3	4	5	6	7	8		1	2	3	4	5	6	7	8		1	2
						Rated temperature of	L1	L2							Rated temperature of
				mA		connection cables must		N
						exceed maximum ambient							mA		connection cables must	19-30 V
						temperature by at least 15 K									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.

LR 460

PLC with mA input card

R = 250 Ω

PC/laptop with HART modem running PDM

HART Communicator 375

3.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.

Page 20 SITRANS LR 460 – INSTRUCTION MANUAL 7ML19985JM01