Toshiba LF414 - Manual (Page 33)

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Notes on wiring
CAUTION
(1) Select the cable runs away from electrical equipment (motors, transformers, or radio
transmitters) which causes electromagnetic or electrostatic interference.
(2) 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
(3) 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.
(4) After wiring, be sure to install the terminal block protection cover.
(5) 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.
5.1 Cables
Use the kind of cables shown in Table 5.1 to wire the converter.
Table 5.1 Installation Cables
Name Cable name
Nominal
cross-section
al area
Finished
outer
diameter
Description
Power cable
3-core vinyl sheathed cable or 2-core vinyl
sheathed cable
2 mm² 11~13mm
CVV JIS C 3401 or
equivalent
Output
signal 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 .
CVV-S JIS -258-C or
equivalent
Flow rate
signal cable
2-core shielded chloroprene cabtyre cable
( Rubber covered cable )
0.75 mm 2 11~13mm
2PNCT-S
JIS C 3327 or
equivalent
Excitation
cable
3-core chloroprene cabtyre cable
( Rubber covered cable ) 2 mm 2
1.25 m 2
11~13mm
2PNCT
JIS C 3327 or
equivalent
Separate
Separate
Separate