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3.6 Network power and ground
Unified Controller nv Series DeviceNet Module DN611B Instruction Manual
33
Figure 3-9 Example of overload single power supply center connection
a) Section 1 current consumption = 1.1 A + 1.25 A + 0.5 A = 2.85 A
a') Section 2 current consumption = 0.25 A + 0.25 A + 0.85 A = 1.35 A
b) Section 1 total extension = Section 2 total extension = 120 m
c) From Figure 3-5, the maximum current that can flow in the cable = about 2.56 A (calculated by linear
approximation between 100 to 150m).
d) Section 1 is overloaded because of total current consumption < maximum current.
Solution: Move the power tap to the overload section. See Figure 3-10.
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
Power
Tap
Section1
120m
Section 2
120m