Cables; Notes On Wiring - Toshiba LF414 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
Separate
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
Power cable
Output
signal cable
Flow rate
signal cable
Separate
Excitation
cable
Separate
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
2 mm
2
1.25 m
－ ３２ －
６Ｆ８Ａ０８７０
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
2PNCT
11~13mm JIS C 3327 or
equivalent