Siemens SITRANS LR250 Instrucciones De Servicio Resumidas página 21

Wiring instructions
1. Strip the cable jacket for approximately 70 mm (2.75") from the end of the cable, and thread the wires through the gland. (If
cable is routed through conduit, use only approved suitable-size hubs for waterproof applications.)
2. Connect the wires to the terminals as shown: the polarity is identified on the terminal block.
3. Ground the device according to local regulations.
4. Tighten the gland to form a good seal.
5. Close the lid and secure the locking screw before programming and device configuration.
Note
Lid-lock set screw not applicable to 3-A Sanitary approved device.
Connecting HART
Typical PLC/mA configuration with HART
①
Power supply
②
SITRANS LR250
③
R = 250 Ω
Note
Depending on the system design, the power supply may be separate from the PLC, or integral to it.
•
HART resistance (total loop resistance, that is, cable resistance plus 250 Ohm [resistor]) must be limited according to the
•
allowable operating area.
SITRANS LR250 (mA/HART)
A5E33469191-AA, 08/2014
④
Active PLC
⑤
HART modem
⑥
HART communicator
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