Yokogawa ADMAG AXW Manual de usuario descargar pdf (Pagina 27)

<5. MAINTENANCE>

5-2

IM 01E25D11-01EN

5.2 Regular Inspection Items

(1) Inspection of moisture-proong inside the

terminal box: Once/year

(2) Retightening of piping joint screws: About

twice/year

(3) Inspection of electrodes and lining (in case

of adhesive and/or abrasive uids, etc.)

Determine the period of regular inspection as

necessary.

5.3 Excitation Coil and

Insulation Resistance Check

WARNING

• Before checking of the excitation coil and the

insulation resistance, be sure that the power

supply for AXFA11 converter has been turned

off.

• Before checking, be sure to disconnect the

cables from the terminals of the remote

owtube.

(1) Excitation Coil Check

Check that there is continuity between terminals

EX1 and EX2 in the terminal box. If there is no

continuity, the coils may be broken and replacement

or repair of the owtube is necessary. The coil

resistance is designed to be 150 Ω or less. If it is

not, this may be an abnormal condition. Consult

Yokogawa’s sales or service ofces.

(2) Insulation Resistance Check

Check the insulation resistances in the terminal

box in accordance with the tables below. If any

of them falls below the values listed in the tables,

consult Yokogawa’s sales or service ofces for

investigation. If the insulation resistance cannot be

restored, replacement or repair of the owtube is

needed. In case of submersible type owmeters,

undo the wiring connection on the converter side

and measure resistance at the cable terminals.

Coil Circuit

Checking is possible even if the pipe is lled with

uid.

Test Terminals Test Voltage Specication

Between

terminals

EX1 and C

500 V DC (Use an

insulation

tester or the

equivalent.)

1 MΩ or more

Signal Circuit

Before testing, be sure to empty and dry the interior

of the pipe, checking that there is no adhesive

material. Also undo the wiring connection on the

converter side before testing.

Test Terminals Test Voltage Specication

Between

terminals

A and C

Between

terminals

B and C

500 V DC (Use an

insulation

tester or the

equivalent.)

100 MΩ or

more for each

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Yokogawa ADMAG AXW Manual de usuario Pagina 27

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