Yokogawa ADMAG AXF - Manual (Page 38)

IM 01E20D01-01E 4-4
4. WIRING
• Install an external switch or circuit breaker as a
means to turn the power off (capacitance; 15A,
conforming to IEC947-1 and IEC947-3). Locate
this switch either near the instrument or in other
places facilitating easy operation. Affix a
“Power Off Equipment” label to this external
switch or circuit breaker.
Wiring Procedure
1. Turn the instrument's power off.
2. Wire the power supply cable and the functional
grounding cable to the power supply terminals.
F0407.EPS
+
SUPPLY
DIO
POWE
-
+
/
LN
/
I
-
+
+
-
D
-
Functional grounding cable
Power supply
cable
Figure 4.1.7 Electric Cable Wiring
(4) DC Power Connection
When using DC power as the power supply for the
converter, give attention to the following points.
1) Connecting Power Supply
IMPORTANT
Do not connect power supply with reversed
polarities.
L/+ terminal: connect +
N/– terminal: connect –
IMPORTANT
Do not connect power supply with 100 to 240 V
AC or 100 to 120 V DC in the case of a 24 V
power supply version (power supply code 2).
It will give a damage to the converter.
2) Required Power Supply Voltages
IMPORTANT
When using a 24 V power supply, the specifica-
tion for the supply voltage is 24 V (–15% to
+20%), but the input voltage of the converter
drops due to cable resistance therefore it must
be used within the following ranges.
Supply Voltage and Cable Length
0
20.4 22 24 26 28.8
200 ( 660)
446 (1460)
600 (1970)
796 (2610)
F0408.EPS
Cable cross section area: 1.25 mm 2
Cable cross section area: 2 mm 2
Allo
w
ab
le cab
le length m(ft)
Usable range E (V)
3) Setting Power Supply Frequency
IMPORTANT
Set the local commercial power frequency in
order to eliminate the effect of induction noise
from the power supply.
Refer to “Chapter 6: Parameter Description” in
the user’s manual of the AXF Integral Flowmeter
[Software Edition] (IM 01E20C02-01E).
Parameter No.: J30 and J31
(5) Grounding
CAUTION
Be sure to connect the protective grounding of
the AXF integral flowmeter with a cable of 2mm
2
or larger cross section in order to avoid electrical
shock to the operators and maintenance engi-
neers and to prevent the influence of external
noise.
Connect the grounding wire to the
mark.
The grounding should satisfy Class D require-
ments (ground resistance, 100
⍀ or less).
In case of TIIS Flameproof type, the grounding
should satisfy Class C requirements (ground
resistance, 10
⍀ or less) or class A requirements
(ground resistance, 10
⍀ or less).