Clipsal C-Bus Bedienerhandbuch Seite 39

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1250SM0904R10/09 C-Bus™ Basic Programming
10/2009 C-Bus™ Products Training Course
© 2009 Schneider Electric. All Rights Reserved. 33
The following figures show the C-Bus network voltage, where the C-Bus
network consists of:
A Single C-Bus onboard power supply at the centre of a network
1 km of C-Bus cable
10 C-Bus input units which each draw 18 mA, evenly spaced along the
cable.
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 23 - C-Bus Power Supply at the centre of a C-Bus netowork
All C-Bus Power Supplies In The Middle Of A Network
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 24 - Voltage drop when power supplies are installed in the
middle of 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 5.71 VDC.
The recommended method of installing C-Bus Power Supplies is to evenly
distribute the power supplies throughout the network. This will ensure that
there is minimal voltage drop, thus guaranteeing an optimum
C-Bus operating voltage.
The following figures shows the C-Bus network voltage, where the C-Bus
network consists of:
Two C-Bus onboard power supplies at each end of the network
1 km of C-Bus cable
10 C-Bus input units which each draw 18 mA, evenly spaced along the
cable.
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