Yokogawa ADMAG AXW Manual do Utilizador descarregar pdf (Página 20)

<4. WIRING>

4-1

IM 01E25D11-01EN

4. WIRING

4.1 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 the user’s manual of the

AXFA11 Magnetic Flowmeter Remote Converter

(IM 01E20C01-01E).

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.

4.1.1 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 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.

• When opening the terminal box cover, use a

hexagonal wrench (nominal size 3 mm). For

handling the locking screw, refer to Figure

4.1.7.

• Be sure to lock the cover using a hexagonal

wrench (nominal size 3 mm) after installing the

cover. For handling the locking screw, refer to

Figure 4.1.11.

• 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.

IMPORTANT

Prepare the signal cable and the excitation cable

almost the same length. It is recommended to lay

them together closely.

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