Cables - Toshiba LF620 Instruction Manual

CAUTION
(1) Select the cable run location so they are 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) Do not remove the blind plug from the cable connectors that are not used.
(4) The converter has a surge arrestor/protector 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.
LF622

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
LF622
Excitation
cable
LF622
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
3-core chloroprene cabtypre cable
Nominal
cross-sectional
area
2 mm²
.
2
0.75 mm
2 mm
1.25 m
− 21 −
6 F 8 A 0 9 2 7
Finished
outer
diameter
CVV JIS C
3401,IEC60695,IEC607
11~13mm
54,IEC60227,IEC60245
or equivalent
CVV-S JIS -258-C or
equivalent
11~13mm
2
2
11~13mm
2
Description
2PNCT-S
JIS C 3327 or
equivalent
2PNCT
JIS C 3327 or
equivalent