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IM 1E7B0-02E
4-15
4. INSTALLATION
4.4.2
General Precautions
Please give attention to the followings in wiring.
CAUTION
• Please pay attention to avoid the cable is
bended excessively.
• In case the ambient temperature exceeds
50˚C(122˚F), please use heat-resistant cables
with maximum allowable temperature of
70˚C(158˚F) or above for JIS flameproof type.
• Please do not connect cables outdoors in case
of rain to prevent damages from dew formation
and to keep insulation inside the terminal box
of the flowmeter.
• The all cable ends are to be provided with
round crimp-on terminal.
• The power cables and signal cables must be
routed in separate steel conduit tubes or
flexible tubes.(except 4-core 24VDC cable
wiring.)
• When waterproof glands, union equipped
waterproof glands are used, the glands must be
properly tightened to keep the box watertight.
• Please install a external switch or circuit
breaker as a means of power off (capacitance;
15A, conform to IEC947-1 and IEC947-3). The
preferable location is either near the instrument
or other places to easy operation. Further-
more, please indicate "power off equipment" on
the those external switch or circuit breaker.
• Please be sure to fully tighten the terminal box
cover before the power is turned on.
• Please be sure to turn off the power before
opening the terminal box cover.
• In case of DC power supply, a plug is attached.
When 4-core cable is used, please put that
plug into unused electrical connection port.
4.4.3
Power and Output Cables
Power cable:
•
Crimp-on Terminal
•
Green/Yellow covered conductors shall be used only
for connection to PROTECTIVE CONDUCTOR
TERMINALS.
•
Conform to IEC227, IEC245 or equivalent national
authorization.
Output cable:
•
Please use Polyvinyl chloride insulated and sheathed
control cables (JIS C3401) or Polyvinyl chloride
insulated and sheathed portable power cables (JIS
C3312) or equivalents.
Outer diameter:
•
6.5 to 12mm in diameter (10.5 or 11.5mm for /ECG,
/ECU; 8.5 to 11mm for /G11, /G12)
Nominal crosss section:
•
Single wire; 0.5 to 2.5mm
2
, Stranded wire; 0.5 to
2.5mm
2
4.4.4
DC Connections
(1)Connecting Power Supply
IMPORTANT
In case of 24VDC power supply, AC power
supplies or reversed polarities cannot be con-
nected. It will cause the fuse to burn out.
(2)Supplied Voltage Rating
IMPORTANT
In case of 24VDC power supply, the specifica-
tion for the supply voltage is 24VDC (-15 to
+20%), but the input voltage of the converter
drops due to cable resistance so it should be
used within the following range.
1000
900
800
700
600
500
400
300
200
100
0
20
22
24
26
28
Usable range E(V)
Supply Voltage and Cable Length
Allowed
cable
length
m(ft)
(3300)
(2970)
(2640)
(2310)
(1980)
(1650)
(1320)
(990)
(660)
(330)
Cable cross section area : 1.25mm
2
Cable cross section area : 2mm
2
(3)Setting Power Supply Frequency
IMPORTANT
In case of 24VDC power supply, the frequency
of the power supply has to be adjusted. Please
adjust for the local power frequency. The power
supply frequency is set in parameter B12 (or
Power freq for HART). Refer to 6.2 or 7.5.2 for
data setting procedure.
4.4.5
Wiring Ports
Please select the most suitable standard of wiring
procedure for the wiring ports by customer’s own.
(1)Using the Waterproof Gland
IMPORTANT
To prevent water or condensate from entering
the converter housing, waterproof glands are
recommended. Do not over-tighten the glands or
damage to the cables may result. Tightness of
the gland can be checked by confirming that the
cable is held firmly in place.
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