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Chapter 3 Install and Wiring
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Figure 3-10 Example of overload solutions
a) Section 1 current consumption = 1.1A + 1.25A = 2.35A
a') Section 2 current consumption = 0.5A + 0.25A + 0.25A + 0.85A = 1.85A
b) Section 1 total extension = 100 m
b') Section 2 total extension = 140 m
c) From Figure 3-5, the maximum current that can flow through the cable in section 1 = about 2.93 A
c') From Figure 3-5, the maximum current that can flow through the cable in section 2 = about 2.19 A (calculated
by linear approximation 100 to 150 m)
d) Since the total current consumption of both sections 1 and 2 < maximum current, power can be supplied to
all nodes with a single power supply central connection.
e) Use a network power supply with a rated current of 4.2 A or more.
(Select a product with sufficient margin in consideration of usage conditions, etc.)
Node
1
Node
2
Node
3
Node
4
Node
5
V+
V- 1.1A 1.25A 0.5A 0.25A 0.25A 0.85A
Node
6
Network
power supply
Section 1
100m
Section 2
140m
Power
tap