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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
AC
OR
transmitter
N L
85-250 VAC
Conduit opening for
power supply wiring
External ground screw
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.
20
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.
DC
transmitter
– +
20-30 VDC
for power supply
Internal ground screw
for power supply
CAUTION
Model IFT9701 Transmitter Instruction Manual
Power
terminals
Field wiring
Field wiring
compartment
compartment
Sensor wiring
compartment
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