APC AXFA11G User Manual download pdf (Page 11)

IM 01E20C01-01E

4-1

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 01E20D01-01E).

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

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 24 V and

four-core cables are used for wiring. Keep

conduits or flexible tubes watertight using

sealing tape.

• 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)

Outer jacket

10.5 (0.413")

Tape

Shield (C)

Insulation

Shields (SA and SB)

Conductors (A and B)

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 heat-resistant vinyl is used for the

outer jacket material.

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.

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APC AXFA11G User Manual Page 11

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