4. WIRING
4.WIRING
This section describes the wiring on the converter side only. For information relating to wiring on the flowtube side, refer to the user’s manual of the AXF Remote Flowtube (IM
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 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.
•Do not splice the cable between the flowtube 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
•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 24 V and
•Ground the remote flowtube 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 power off before opening the cover.
•Before turning the power on, tighten the cover securely.
4.2 Cables
(1) Dedicated Signal Cable (AXFC)
Conductors (A and B)
Shields (SA and SB)
Tape
Outer jacket | 10.5 (0.413") |
Shield (C)
Insulation
Insulation
F0401.EPS
Figure 4.2.1 Dedicated Signal Cable AXFC
The flow signal is transmitted via this dedicated cable. The cable is constructed with double shielding over the two conductors, and
Finished diameter: | 10.5 mm (0.413") |
Maximum length: | 200 m (660 ft) |
Maximum temperature: | 80°C (176°F) |
IMPORTANT
If the cable is longer than required, cut off any extra length rather than coiling it up, and termi- nate the conductors as shown in Figure 4.2.2.
Avoid using junction terminal boards to extend the cable length, as this will interrupt the shield- ing.
IM |
