Endress+Hauser Micropilot NMR84, Руководство по эксплуатации

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Micropilot NMR84 Electrical connection
Hauser 35
6.2 Connecting requirements
6.2.1 Cable specification
Terminals
Wire cross section 0.2 to 2.5 mm
2 (24 to 13 AWG)
Use for terminals with function: Signal and power supply
• Spring terminals (NMx8x-xx1...)
• Screw terminals (NMx8x-xx2...)
Wire cross section max. 2.5 mm 2 (13 AWG)
Use for terminals with function: Ground terminal in the terminal compartment
Wire cross section max. 4 mm 2 (11 AWG)
Use for terminals with function: Ground terminal at the housing
Power supply line
Standard device cable is sufficient for the power line.
Analog signal lines
Screened cable must be used for:
• the 4 to 20 mA signal lines.
• the RTD connection.
Digital I/O signal lines
• Shielded cable is recommended if using the relays.
• Observe the grounding concept of the plant.
HART communication line
Shielded cable is recommended if using the HART protocol. Observe the grounding concept
of the plant.
Modbus communication line
• Observe the cable conditions from the TIA-485-A, Telecommunications Industry
Association.
• Additional conditions: Use shielded cable.
V1 communication line
• 2-wire twisted pair, screened or unscreened cable
• Resistance in one cable: ≤ 120 Ω
• Capacitance between lines: ≤ 0.3 µF
WM550 communication line
• 2-wire twisted pair, unscreened cable
• Cross section minimum 0.5 mm 2 (20 AWG)
• Maximum total cable resistance: ≤ 250 Ω
• Cable with low capacitance