IM 01E20D01-01E
4-1
4. WIRING
4.
WIRING
4.1 Wiring the Integral
Flowmeter
This section describes the wiring of the integral flowmeter.
WARNING
The wiring of the magnetic flowmeter must be
performed by expert engineer or skilled person-
nel. No operator shall be permitted to perform
procedures relating to wiring.
CAUTION
Once all wiring is complete, check the connec-
tions before applying power to the instrument.
Improper arrangements or wiring may cause a
unit malfunction or damage.
4.1.1
Wiring Precautions
Be sure to observe the following precautions when
wiring:
CAUTION
• In cases where the ambient temperature
exceeds 50°C (122°F), use external heat-
resistant wiring with a maximum allowable
temperature of 70°C (158°F) or above.
• Do not connect cables outdoors in wet weather
in order to prevent damage from condensation
and to protect the insulation, e.g. inside the
terminal box of the flowmeter.
• All the cable ends must be provided with round
crimp-on terminals and be securely wired.
• The signal cables must be routed in separate
steel conduit tubes 16 (JIS C 8305) or flexible
conduit tubes 15 (JIS C 8309).
• Always route the power and output signal
cables in separate steel conduit tubes, except
when the power supply voltage is 24V and four-
core cables are used for wiring. Keep conduits
or flexible tubes watertight using sealing tape.
• When waterproof glands or union equipped
waterproof glands are used, avoid tightening
the glands with an excessive torque.
• When the power supply voltage is 24V and
electrical connection is a JIS G1/2 female, it
comes with a blanking plug. Use this plug to
cover the unused wiring port when wiring the
instrument with only one, four-core cable.
• Be sure to turn the power off before opening
the terminal box cover.
• Before turning the power on, tighten the
terminal box cover securely.
• The terminal box cover is locked by the special
screw. In case of opening the terminal box
cover, use the hexagonal wrench attached. For
handling the locking screw, refer to Figure
4.1.5.
• Be sure to lock the cover by the special screw
using the hexagonal wrench attached after
installing the cover. For handling the locking
screw, refer to Figure 4.1.15.
• Explosion protected types must be wired in
accordance with specific requirement (and, in
certain countries, legal regulations) in order to
preserve the effectiveness of their explosion
protected features.
4.1.2
Power Cable/Output Cable
JIS C 3401 control cable equivalent
JIS C 3312 power cable equivalent
14 AWG Belden 8720 equivalent
Outer Diameter:
With no gland option:
6.5 to 12 mm (0.26 to 0.47 in.)
With gland options EG, EU:
10.5 or 11.5 mm (0.41 to 0.45 in.)
With gland options EP:
6 to 12 mm (0.24 to 0.47 in.)
Nominal Cross Section:
Single wire; 0.5 to 2.5 mm
2
Stranded wire; 0.5 to 1.5 mm
2
In case of power cable, Green/Yellow covered conduc-
tor shall be used only for connection to PROTECTIVE
CONDUCTOR TERMINALS. Conform to IEC227,
IEC245 or equivalent national authorization.
