Emerson IFT9701 Manuel d'instructions télécharger pdf (Page 28)

20 Model IFT9701 Transmitter Instruction Manual

Power Supply and Output Wiring continued

4.3 Connect power supply wiring

• Figure 4-1 shows the power supply wiring terminals.

• Wiring terminals accommodate 20 AWG (0,5 mm²) to 16 AWG (1,5 mm²) wire. If the

transmitter has a DC power supply, see Table 4-1 for wire length and size guidelines.

• Connect power supply wiring to the power supply terminals.

• A switch may be installed in the power supply line. For compliance with low-voltage directive

73/23/EEC, a switch in close proximity to the transmitter is required.

• Do not install power cable in the same conduit or cable tray as flowmeter cable or output

wiring.

• The transmitter must be grounded with a maximum impedance of 1 ohm. Either the internal

ground screw or external case ground screw may be used as required by local policy or code.

Figure 4-1 Power supply wiring terminals

CAUTION

Incorrect voltage, or installation with power supply

on, could cause transmitter damage or failure.

• Match power supply voltage with voltage indicated on

label in field wiring compartment.

• Shut off power before installing transmitter.

–+

85-250 VAC 20-30 VDC

If national standards are not in effect, adhere to these guidelines for grounding:

• Use copper wire, 14 AWG (2,5 mm²) or larger wire size.

• Keep all ground leads as short as possible, less than 1 ohm impedance.

• Connect ground leads directly to earth, or follow plant standards.

• For hazardous area installation in Europe, use standard EN 60079-14 as a guideline.

Field wiring

compartment

Sensor wiring

compartment

External ground screw

for power supply

Conduit opening for

power supply wiring

Internal ground screw

for power supply

Field wiring

compartment

Power

terminals

transmitter

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Emerson IFT9701 Manuel d'instructions Page 28