Emerson IFT9701 사용자 설명서
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.
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.
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.
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.
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.
on, could cause transmitter damage or failure.
•
Match power supply voltage with voltage indicated on
label in field wiring compartment.
label in field wiring compartment.
•
Shut off power before installing transmitter.
– +
85-250 VAC
20-30 VDC
N L
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.
• 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
compartment
Sensor wiring
compartment
compartment
External ground screw
for power supply
Conduit opening for
power supply wiring
Internal ground screw
for power supply
Field wiring
compartment
compartment
Power
terminals
terminals
AC
transmitter
DC
transmitter
OR