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3.5 Network Power/Grounding
3
If the current consumption of a section exceeds the maximum current in a configuration
of single power unit central connection, take steps as shown in the table below. Figure 3-
14 shows an example of overloaded single power unit central connection.
Figure 3-13 Example of Overloaded Single Power Unit Central Connection
(a) Total current consumption of section 1
(a’) Total current consumption of section 2
(b) Overall power cable length of section 1 = Overall power cable length of section 2
= 120 m
(c) Maximum current that can be supplied to the cables based on Figure 3-10 =
About 2.56 A (Obtained by linear approximation of 100 to 150 m)
(d) Since the total current consumption of section 1 is greater than the maximum
current, the power line is overloaded.
Solution: Move the power tap to the overloaded section. See Figure 3-14.
Section exceeding the maximum current to
cables
Step
Only one of the two section Move a node from the overloaded section to the
other section.
Move the power tap closer to the section
overloaded.
Both sections Use two power taps.
Node 6Node 5Node 4Node 1Node 2Node 3
ネットワーク
電源供給装置
電源
タップ
セクション 1
120 m
V
+−
1.1A 1.25A 0.5A V
−
0.25A 0.25A 0.85A
セクション
2
120 m
Section 1 Section 2
Power
tap
Network power
unit
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