Toshiba LF414 Manual De Instrucciónes

− ３６ −

６Ｆ８Ａ０８７０

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

CVV-S JIS -258-C or
equivalent

Flow rate

signal cable

2-core shielded chloroprene cabtyre cable
( Rubber covered cable )

0.75 mm

11~13mm

2PNCT-S

JIS C 3327 or

equivalent

Excitation

cable

3-core chloroprene cabtyre cable
( Rubber covered cable )

2 mm

1.25 m

11~13mm

2PNCT

JIS C 3327 or

equivalent

Separate