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C-Bus™ Basic Programming 1250SM0904R10/09
C-Bus™ Products Training Course 10/2009
34 © 2009 Schneider Electric. All Rights Reserved.
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
Power
Supply
200 mA
Figure 25 - A C-Bus Power Supply at each end of a C-Bus network
Evenly Distributed C-Bus Power Supplies
0
5
10
15
20
25
30
35
40
0 100 200 300 400 500 600 700 800 900 1000
C-Bus Cable Length (m)
C-Bus Voltage (V)
Figure 26 - Voltage drop when power supplies are evenly distributed in
a C-Bus network
On a network with conditions as specified above, you will note that there will
be an estimated Voltage drop of approximately 3.6 VDC.
Short Circuit and Overload Protection
A C-Bus Power Supply contains electronic protection circuitry, which
protects from short circuit and overload conditions. The protection circuitry
will react when:
the positive and negative C-Bus pairs are shorted together
a C-Bus cable is incorrectly terminated in an RJ45 plug
the C-Bus network is drawing more current than the power supply can
provide.
When the protection circuitry is engaged, the power supply will limit the
amount of current that flows to a safe level. This will ensure that the power
supply or any other C-Bus units are not damaged.
Over Voltage Protection
It is recommended that sufficient over voltage and lightning protection be
installed to protect C-Bus units.
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