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C-Bus™ Basic Programming 1250SM0904R10/09

C-Bus™ Products Training Course 10/2009

Step 1 • Value A = (Maximum VA per channel) / (VA of the load)

• Round down Value A.

Step 2 • Value B = (Capacitance per channel) / (Input capacitance of

the load)

• Round down Value B.

Step 3 Compare Value A and Value B. The lower of the two is how

many electronic transformers can be wired to a single C-Bus

dimming channel.

Table 9 - Calculating how many electronic transformers can be used

The following is an example of how to calculate the number of electronic

transformers that can be used on a single C-Bus dimmer channel.

Assume you have an electronic transformer that you want to wire to a

C-Bus 8 Channel DIN Rail Dimmer. The brand ‘XYZ electronic transformer’

has the following properties:

 a VA rating of 55 VA

 an input capacitance of 100 nF.

Step 1 Value A = 240 VA / 55 VA

= 4.36

Rounded Down = 4

Step 2 Value B = 300 nF / 100 nF

= 3

Rounded Down = 3

Step 3 Value B is less than Value A, therefore only 3 “XYZ” electronic

transformers can be wired to a single channel of a C-Bus 8

Channel DIN Rail Dimmer.

Table 10 - Example calculation

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Clipsal C-Bus Bedienerhandbuch Seite 26