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C-BUS TRAINING MANUAL - VOL 1

8.0 C-Bus Operating Parameters

The following are important considerations when planning a C-Bus network:

1. The maximum total length of Cat-5 UTP cables on any one C-Bus network is 1 km.

2. The maximum recommended number of C-Bus units on any one network is 100 units. The actual

number is dependent on the impedance and amount of ﬂowing current. The current must not

exceed 2A.

3. Multiple C-Bus power supplies can be connected to a C-Bus network to provide sufﬁcient power

for C-Bus units. The power supplies will share the load evenly. The maximum combined power

supply output for a single network is 2A. Examples of acceptable conﬁgurations for a single

network are:

• 6 × 5100PS rated at 350mA each

• 10 × DIN Rail Output Unit on-board power supplies rated at 200mA each

• 30 × Pro Series Dimmer power supplies (except the 12 Channel) rated at 60mA each.

4. Any combination of power supply units is allowed as long as the total power available does not

exceed 2A.

5. Where more than 1 km of cable or 100 standard C-Bus units are required, two or more networks

can be linked using a network bridge.

6. Each C-Bus network requires only one network burden. A burden is contained within:

• all C-Bus output units (such as dimmers and relays)

• most system support devices (such as a PC or network interface)

• some input units (including C-Touch and the Four Channel General Input Unit).

A network burden can also be assembled using a 1kW, 0.6W (or higher) resistor and a 10mF,

50V capacitor in series, connected across the C-Bus 36V rails.

7. Each C-Bus network requires at least one (and a recommended maximum of three) system clock

generating units. A system clock generator is contained within:

• all C-Bus output units (such as dimmers and relays)

• most system support devices (such as a PC or network interface)

• some input units (including C-Touch and the Four Channel General Input Unit).

8. The maximum number of networks that may be combined in a single installation is 255.

9. The maximum number of networks that may be connected in series to the local network is seven

(using six network bridges).

10. C-Bus power supply units (including DIN and Pro units) may be connected to different phases.

11. Individual relay channels may be connected to different phases. On DIN Rail Dimmers, the 240V

supply connected to the units’ power supply and the output channels, must be on the same

phase.

12. The isolation between the 240Va.c. mains and the 36Vd.c. C-Bus circuitry is greater than 3.5kV.

This is achieved using double wound transformers and opto-isolators.

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Clipsal C-Bus Especificaciones Pagina 24