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Step 1: Evaluating the Configuration with Graphs
3-4-1
Simple Evaluation of Power Supply Location from a Graph
1,2,3...
3-4-2
Modifying the Configuration
Flat Cable
Distance (m) 0
20
Maximum
5.00 5.00 5.00 2.75 2.21 1.58 1.11 0.85 0.74
current (A)
6
5
4
3
2
1
0
0
20
40
60
80
Check items 1 to 3 listed below for all of the nodes located in the same direc-
tion from the power supply. (If power is supplied in two directions, check these
3 items for all of the nodes in each direction.)
1. Calculate the total current consumption (I
munications power is to be supplied in one direction.
2. Refer to the graph to find the maximum current flow (I
ble based on the type of cable being used (thick or thin) and the distance
from the power supply to the end of the trunk line.
3. Compare the values (I
power supply specifications are met and power can be supplied properly
to all nodes.
Note Be sure to refer to the correct graph because the maximum current
flow is different for thick and thin cables.
If the graph indicates that power cannot be supplied properly in one direction
(I
> I
), use the following procedure to modify the communications power
A
B
supply configuration.
• Move the communications power supply towards the center of the net-
work so that there are nodes to both sides of it.
• If there are already nodes on both sides of the power supply, move the
power supply in the direction that requires the higher current.
• If thin cable is being used, replace it with thick cable.
If power still cannot be supplied properly in one direction (I
the changes listed above, proceed to Step 2 and calculate the actual current
requirements based on each node's position in the network and its current
consumption.
40
80
100
140
100 120 140 160 180 200 220 240
Distance (m)
) of all the nodes to which com-
A
and I
) found in steps 1 and 2 above. If I
A
B
Section 3-4
200
260
300
260 280 300
) allowed in the ca-
B
≤ I
A
> I
) after making
A
B
, the
B
93
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