YOKOGAWA AXFA14G - Wiring the Remote Flowtube

<4. Wiring>
35
IM 01E20A01-01EN
4.2 Wiring the Remote Flowtube
Thissectiondescribesthewiringoftheremoteowtube
only. For information relating to the wiring of the converter,
refer to Section 4.3 or Section 4.4 of this manual.
WARNING
Thewiringofthemagneticowmetermustbe
performed by expert engineer or skilled personnel.
No operator shall be permitted to perform procedures
relating to wiring.
CAUTION
Once all wiring is complete, check the connections
before applying power to the instrument. Improper
arrangements or wiring may cause a unit malfunction
or damage.
4.2.1 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owtube.
•
Donotsplicethecablebetweentheowtubeterminal
and the converter if it is too short. Replace the short
cable with a cable that is the appropriate length.
• 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exibleconduit
tubes15(JISC8309).
• Keepconduitsorexibletubeswatertightusing
sealing tape.
• Groundtheremoteowtubeandtheconverter
separately.
• Cover each shield of the signal cable with vinyl
tube or vinyl tape to avoid contact between two
shields or between a shield and a case.
• When waterproof glands or union equipped
waterproof glands are used, avoid tightening the
glands with an excessive torque.
• 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 4.2.8.
• 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 4.2.16.
• Explosion protected types must be wired in
accordancewithspecicrequirement(and,in
certain countries, legal regulations) in order to
preserve the effectiveness of their explosion
protected features.
• When submersible type or optional code DHC is
selected, waterproof glands, signal and excitation
cables are attached. In order to preserve the
effectiveness of waterproof features, the terminal
box cover and waterproof glands must not be
detachedfromowmeter.
Wiring
4