YOKOGAWA AXFA14G User Manual

<4. Wiring>
39
IM 01E20A01-01EN
1) Connection with the AXFA11 converter
In case of FM or CSA certiedAXFremoteowtube,
connectwiringasshowninthegurebelow.
In case of the explosion proof type, the protective
grounding
ofremoteowtubemustbeconnected
to a suitable IS grounding system. In that case,
(functional grounding terminal) need not be
connected.
I+ 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
AXFC dedicated
signal cable
Converter
Remote
flowtube
F0429.ai
SA
A
B
SB
C
EX1
EX2
Taping*
A
B
Taping*
C
EX1
EX2
* Individually tape and insulate
the shields corresponding to
SA and SB on the remote
flowtube side.
Excitation cable
EX2
EX1
A
B
C
Remote flowtube
Figure 4.2.13 Wiring Diagram
2) Connection with the AXFA14 converter
IncaseofATEX,FM,CSA,IECExorTIIScertied
AXFremoteowtube,connectwiringasshowninthe
gurebelow.
In case of the explosion proof type, the protective
grounding
ofremoteowtubemustbeconnected
to a suitable IS grounding system. In that case,
(functional grounding terminal) need not be
connected.
AXFC dedicated
signal cable
Excitation cable
EX1
EX2
C
SA
A
B
SB
Converter
Remote
flowtube
SA
A
B
SB
C
EX1
EX2
Taping*
A
B
Taping*
C
EX1
EX2
* Individually tape and insulate
the shields corresponding to
SA and SB on the remote
flowtube side.
AXFA14 converter
EX2
EX1
A
B
C
Remote flowtube
F0430.ai
Figure 4.2.14 Wiring Diagram
(5) Grounding
CAUTION
Be sure to connect the protective grounding of the
AXFremoteowtubewithacableof2mm
2
or 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
(groundingresistance,100Ωorless).IncaseofTIIS
Flameproof type, the grounding should satisfy Class
Crequirements(groundingresistance,10Ωorless)
orclassArequirements(groundingresistance,10Ω
or less).
For explosion proof type except TIIS, follow the domestic
electrical requirements as regulated in each country.
IMPORTANT
Improper grounding can have an adverse effect 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. The
magneticowmeterisequippedwithagroundingringthat
makesaconnectionwiththechargeofthemeasureduid
for grounding and protects the lining.
Be sure to ground according to Figure 4.2.15.
• Class D requirements (grounding resistance. 100
Ω or less).
• TIIS Flameproof type: Class C requirements (grounding resistance, 10
Ω
or less) or Class A requirements (grounding resistance, 10 Ω or less)
• Explosion proof type except TIIS: Domestic electrical requirements as
regulated in each country.
Grounding ring
600 V vinyl insulated
electric cable
(2 mm
2
or larger)
F0431.ai
In case grounding rings
are used.
In case grounding rings are not used.
(Available only for metal piping)
Figure 4.2.15 Protective Grounding Terminal Location
Wiring
4

YOKOGAWA AXFA14G Specifications

General

Brand	YOKOGAWA
Model	AXFA14G
Category	Measuring Instruments
Language	English