Yokogawa AXFA11 Magnetic Flow Converter - Manual (Page 5)

IM 01E20C01-01E
4. WIRING
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.
20 (0.8) ␾ 10.5 (0.4)
AXFC
L (Specified Dimensions)
150
Ϯ 5 8 (0.3) max.
150
Ϯ 5
70 (2.76)
60 (2.36) 90 (3.54)
(5.9) (5.9)
55 (2.17)
90 (3.54)
50 (1.97)
25 (0.98)
SA SB
A
C
B A
C
B
8(0.3) max.
White Black Red
White Black Red
F0402.EPS
Unit : mm
(approx. inch)
On the
converter
side On the
flowtube
side
Figure 4.2.2 Treatment of Dedicated Signal Cables
CAUTION
• As crimp terminals A, B, SA, SB and C have
their own electrical potentials, securely insulate
them so as not to come in contact with one
another.
• To prevent a shield from coming in contact with
another shield or the case, cover each shield
with a vinyl tube or wrap it in vinyl tape.
NOTE
Conductors A and B carry the signal from the
electrodes, and C is at the potential of the liquid
(signal common). Shields SA and SB are kept
at the same potentials as the individual elec-
trodes (these are actively driven shields.) This is
done to reduce the effect of the distributed
capacitance of the cable at long cable length.
Note that, since the signals from the individual
electrodes are impedance converted inside the
converter, errors will result if they come in
contact with any other component. Great care
must be taken in the cable end treatment.
(2) Excitation Cable/Power Cable/Output
Cable
JIS C3401 control cable equivalent
JIS C3312 power cable equivalent
14 AWG Belden 8720 equivalent
Outer Diameter:
With no gland option;
6.5 to 12 mm (0.26 to 0.47 in.)
With gland options EG, EU and EW;
• Excitation cable;
10.5 or 11.5 mm (0.41 or 0.45 in.)
• Power and output cable;
7.5 to 12 mm (0.30 to 0.47 in.)
With gland options EP;
6 to 12 mm (0.24 to 0.47 in.)
Nominal Cross Section:
Single wire; 0.5 to 2.5 mm 2
Stranded wire; 0.5 to 1.5 mm 2
In case of power cable, Green/Yellow covered conduc-
tor shall be used only for connection to PROTECTIVE
CONDUCTOR TERMINALS. Conform to IEC227,
IEC245 or equivalent national authorization.
On the converter side
85 (3.35)
EX1 EX2 EX1 EX2
85 (3.35)
On the flowtube side
Unit : mm
(approx. inch)
F0403.EPS
Crimp Terminal
Figure 4.2.3 End Treatment of Excitation Cable
NOTE
• For excitation and power cables, always use a
crimp terminal with an insulation cover.
• Use crimp tools from the manufacturer of the
crimp terminal you want to use to connect the
crimp terminal and cable.
• Use crimp tools that are appropriate for the
diameter of the cable to be connected.
4-2