Yokogawa ADMAG AXW Bedienungsanleitung PDF herunterladen (Seite 24)

  <4.WIRING>

4-5

IM 01E25D11-01EN

(3) WiringtheRemoteFlowtubewithAXFA11

Converters

Connect wiring as shown in the gure below.

I+

4-20mA out

Shortbar

I–

CURRENT OUT

AL+ AL– C SA A B SB

ALARM OUT

N/– L/+

POWER SUPPLY

EX2EX1

EXCIT ATION

P– SI1+ SI2+ COMP+

PULSE OUT STATUS IN

SIGNAL

SO1+ COMSO2+

STATUS OUT

FUSE

2.5A 250V

AXFA11 converter

Converter

Remote

flowtube

F0409.ai

EX1

EX2

Taping*

EX1

EX2

* Individually tape and insulate

the shields corresponding to

SA and SB on the remote

flowtube side.

Remote flowtube

EX2

Excitation

cable

EX1

AXFC dedicated

signal cable

Figure4.1.9 WiringDiagram

(4) Grounding

CAUTION

Be sure to connect the protective grounding of

the remote owtube with a cable of 2 mm

larger cross section in order to avoid electrical

shock to the operators and maintenance

engineers and to prevent the inuence of

external noise.

Connect the grounding wire to the mark.

The grounding should satisfy Class D

requirements (ground resistance, 100 Ω or less).

IMPORTANT

Improper grounding can have an adverse affect

on the ow measurement. Ensure that the

instrument is properly grounded.

The electromotive force of the magnetic owmeter

is minute and it is easy to be affected by noise. And

also that reference electric potential is the same

as the measuring uid potential. Therefore, the

reference electric potential (terminal potential) of

the owtube and the converter also need to be the

same as the measuring uid. Moreover, that the

potential must be the same with ground.

Be sure to ground according to Figure 4.1.10.

Refer to Figure 3.3.5 or 3.3.6 for wiring to the

anges of remote owtube when optional grounding

rings are not used.

• Class D requirements (ground resistance.

100 Ω or less).

600 V vinyl insulated

electric cable

(2 mm

or larger)

F0410.ai

With optional grounding

rings.

Without optional grounding rings.

(Available only for metal piping)

Figure4.1.10ProtectiveGroundingTerminalLocation

(5)InstallingtheCover

Install the cover to the owtube by turning it in the

direction of the arrow as shown below. Tighten

the cover locking screw counterclockwise using a

hexagonal wrench (nominal size 3 mm) to lock the

cover.

F0411.ai

Figure4.1.11 InstallingtheTerminalBoxCover

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 51 52

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