Toshiba nv Series Instruction Manual page 55

Node
3
1.1A
Figure 3-15 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 3-11, 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 3-16.
Section1
120m
Node
Node Power
1
2 Tap
1.25A 0.5A
power supply
Unified Controller nv Series DeviceNet Module DN912 Instruction Manual
Section 2
120m
V+
Node Node
4 5
V-
0.25A 0.25A
Network
3.5 Network power and ground
Node
6
0.85A
39