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C-Bus™ Basic Programming 1250SM0904R10/09
C-Bus™ Products Training Course 10/2009
32 © 2009 Schneider Electric. All Rights Reserved.
Power Supply Placement
When installing C-Bus Power Supplies, it is best not to install all the C-Bus
Power Supplies at the end of a network, as there will be significant voltage
drop at the other end of the network.
The following figures shows the C-Bus network voltage, where the C-Bus
network consists of:
A Single C-Bus onboard power supply at the end of a network
1 km of C-Bus cable
10 C-Bus input units which each draw 18 mA, evenly spaced along the
cable.
Power
Supply
200 mA
Input
Unit
-18 mA
Input
Unit
-18 mA
Input
Unit
-18 mA
Input
Unit
-18 mA
Input
Unit
-18 mA
Input
Unit
-18 mA
Input
Unit
-18 mA
Input
Unit
-18 mA
Input
Unit
-18 mA
Input
Unit
-18 mA
1 km of C-Bus Cable
Figure 21 - C-Bus Power Supply at one end of a C-Bus network
All C-Bus Power Supplies At The End Of A Network
0
5
10
15
20
25
30
35
40
0 200 400 600 800 1000
C-Bus Cable Length (m)
C- Bus Volt age (V)
Figure 22 - Voltage drop when power supplies are installed at the end
of the C-Bus network
On a network with conditions as specified above, you will note that there will
be an estimated Voltage drop of approximately 14.4 VDC.
The preferred C-Bus Power Supply installation method is to install the
power supplies at the centre of the
C-Bus network. This can easily be achieved by using Star or Combination
cable topologies. This will reduce the amount of voltage drop along the
C-Bus cable.
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