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C-BUS TRAINING MANUAL - VOL 1

6.0 C-Bus Power Supplies

The two-wire connection between C-Bus units serves two purposes. It is the communication medium

through which on and off signals are sent between inputs and outputs. It also carries a 36Vd.c. supply

to power the electronics in C-Bus units.

6.1 Voltage and Electrical Characteristics

The C-Bus power supply is isolated from the mains supply by at least 3kV. It achieves this isolation

using a double wound transformer. The output voltage is capped at 36V. C-Bus units that connect to

both mains and C-Bus supplies use transformers or opto-isolators to achieve isolation.

To achieve successful communication across the bus, power supplies must have the correct electrical

characteristics. For this reason only C-Bus power supplies are suitable for use in a C-Bus installation.

6.2 Short Circuit and Overload Protection

The internal circuitry of the power supply will react if:

• the bus conductors are shorted together

• too many C-Bus units are connected to a supply

• a C-Bus unit is incorrectly connected.

In all cases the power supply will limit the amount of current that ﬂows to a safe level, ensuring that

neither it nor any other C-Bus unit is damaged.

6.3 Over Voltage Protection

It is recommended that sufﬁcient over voltage and lightning protection be ﬁtted, particularly in areas

where there is a high incidence of lightning strikes. The Clipsal 970 Series may be useful for this

purpose.

6.4 Multiple Power Supplies

Where the number of C-Bus units used on a system exceeds the capability of a C-Bus power

supply, additional power supplies are connected to increase capacity. In larger installations the

power supplies are best distributed around the system, to minimise voltage drop across the C-Bus

conductors. On any one C-Bus network, the combined power from the power supplies should not

exceed 2A, as this would exceed the current handling capability of the Cat-5 cable.

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