Micro Motion RFT9709 Manual de instrucciones Pagina 16

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8
RFT9709 Transmitter Instruction Manual
Wiring
continued
2.2 Power supply wiring and
grounding
For power-supply wiring and grounding, follow these guidelines:
• The RFT9709 requires an 11 to 30 VDC power supply.
• Do not install unfiltered DC power cable in the same conduit or cable
tray as sensor cable or output wiring.
• If the sensor installation must comply with UL standards, refer to
Micro Motion UL-D-IS Installation Instructions.
• Refer to the wiring diagram presented in Figure 2-2.
Figure 2-2. Power-supply wiring and grounding connections
WARNING
Failure to comply with requirements for intrinsic
safety in a hazardous area could result in an
explosion.
Power-supply wiring is not intrinsically safe.
Keep power-supply wiring separated from intrinsically
safe sensor wiring and output wiring.
For intrinsically safe sensor installations, use this
document with Micro Motion UL installation instructions.
CAUTION
Installation with power supply on could cause
transmitter damage or failure.
Turn off power before connecting power supply wiring.
11–30 VDC power supply
Terminal Function
23 DC–
24 DC+
25
#6-32 ground nut
#6-32 ground nut
Mounting boss
If equipment ground is not established via
mounting, connect a low-impedance ground at
either ground nut.
If national standards are not in effect, adhere to these standards for
ground wiring:
Use copper wire, 14 AWG (2.5 mm²) or larger wire size for grounding.
Keep all ground leads as short as possible, less than 1 ohm impedance.
Connect power-supply ground lead directly to earth ground, or follow plant
standards if a separate high-integrity intrinsically safe ground scheme is used.
09wire.fm Page 8 Monday, March 1, 1999 4:31 PM
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