Clipsal C-Bus Instruction Manual Page 42

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C-Bus™ Basic Programming 1250SM0904R10/09
C-Bus™ Products Training Course 10/2009
36 © 2009 Schneider Electric. All Rights Reserved.
Table 16 - Calculating the required C-Bus current
Output Unit Current Calculation
Unit Type Quantity Current Supplied Total Current
Onboard
Power
Supply
2 200 mA 400 mA
Standalone
Power
Supply
1 350 mA 350 mA
Total Current Provided: 750 mA
Table 17 - Calculating the available C-Bus current
NOTE: You may use any combination of C-Bus Power Supplies, but the
current drawn must not exceed the current supplied.
C-Bus Current Consumption
When using any combination of C-Bus Power Supplies, it is important to
ensure that the current drawn by all
C-Bus units does not exceed the current provided by the C-Bus Power
Supplies.
If the current drawn exceeds the current provided, there will be a sharp
voltage drop at the limit of the available current.
The figure below shows the effect on the C-Bus voltage when C-Bus units
are added to a C-Bus network.
NOTE: When the C-Bus current that is being consumed approaches the
amount of C-Bus current being provided, a slight increase in current draw
will cause the C-Bus voltage to drop off. To avoid this, it is recommended to
provide an extra 100 mA of current (as headroom) for each C-Bus network.
Voltage Output V's Current Draw
198 mA
0
5
10
15
20
25
30
35
40
0 50 100 150 200 250
Current Draw (mA)
C-Bus Voltage (V)
Figure 27 - The effect of C-Bus voltage when drawing too much C-Bus
current
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