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Notes on wiring
CAUTION
(1) The apparatus does not be provided with the cable connections. Please prepare yourself
for the cable connections which could be used in Division2 hazardous locations.
The cable lead –in section must be tightened securely to keep air tightness.
(2) Select the cable runs away from electrical equipment (motors, transformers, or radio
transmitters) which causes electromagnetic or electrostatic interference.
(3) Deterioration of flowmeter circuit insulation occurs if the converter interior or cable ends
get wet or humidified. This in turn causes malfunction of flowmeter or noise problems.
Avoid a rainy day if the flowmeter is to be installed outdoors. Even indoors, prevent
water from splashing over the flowmeter. Try to finish the wiring as quickly as possible
(4) The converter has an arrestor installed inside. Therefore, do not conduct a withstand
voltage test for the converter. To check the insulation of the converter, use a voltage of
250Vdc or less.
(5) After wiring, be sure to install the terminal block protection cover.
(6) Because the excitation cable and flow rate signal cable transmit very delicate signals, pass
each of them separately through a thick steel conduit tube, keep them away from the large
current wiring as far as possible, and do not install them in parallel.
LF622F
5.1 Cables
Use the kind of cables shown in Table 5.1 to wire the converter.
Name
Power cable
Output
signal cable
Flow rate
signal cable
LF622F
Excitation
cable
LF622F
Table 5.1 Installation Cables
Cable name
3-core vinyl sheathed cable or 2-core vinyl
sheathed cable
The number of conductors the cable contains differs depending on the
specification of the output signal cable.
Use a shielded cable of finished outer diameter 11 to 13mm and
nominal cross-sectional area 1.25mm
2-core shielded chloroprene cabtyre cable
( Rubber covered cable )
3-core chloroprene cabtyre cable
( Rubber covered cable )
—
Nominal
cross-section
al area
2 mm²
2
.
0.75 mm
2 mm
1.25 m
—
26
６Ｆ８Ａ０９４３
Finished
outer
Description
diameter
CVV JIS C 3401 or
11~13mm
equivalent
CVV-S JIS -258-C or
equivalent
2PNCT-S
2
11~13mm
JIS C 3327 or
equivalent
2
11~13mm
JIS C 3327 or
2
equivalent
2PNCT
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Troubleshooting
