Cables; Notes On Wiring - Toshiba LF654 Instruction Manual

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.
Name
3-core vinyl sheathed cable or 2-core vinyl
Power cable
sheathed cable
The number of conductors the cable contains differs depending on the
Output specification of the output signal cable.
signal cable Use a shielded cable of finished outer diameter 11 to 13mm and
nominal cross-sectional area 1.25mm
Flow rate
2-core shielded chloroprene cabtyre cable
signal cable
( Rubber covered cable )
LF622F
Excitation
3-core chloroprene cabtyre cable
cable
( Rubber covered cable )
LF622F
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Table 5.1 Installation Cables
Cable name
2
.
− ２６ −
Nominal Finished
cross-section outer
al area diameter
2 mm² 11~13mm
2
0.75 mm 11~13mm
2
2 mm
11~13mm
2
1.25 m
６Ｆ８Ａ０９２６
Description
CVV JIS C 3401 or
equivalent
CVV-S JIS -258-C or
equivalent
2PNCT-S
JIS C 3327 or
equivalent
2PNCT
JIS C 3327 or
equivalent