Communication-capable Circuit Breakers

WL Circuit Breaker

Power Supply

The CubicleBUS must be supplied with a UL Listed 24V DC class 2 power supply across its entire length. Reference pages 2/33 and 2/34 of this manual for details pertaining to the requirements of this power supply. Terminals X8.3 and X8.4 or the 4-pin plug for the external CubicleBUS modules (X3) are available for this purpose. As previously mentioned, the 24V is conducted via the CubicleBUS cables.

The power required for the 24V DC supply depends on the CubicleBUS configuration. The technical data for the external CubicleBUS modules is provided later in this chapter.

The control system (of the

CubicleBUS) must be connected to a fused power supply (class 2), since the system voltage drops to an unspecified value in the event of a short-circuit.

Attention: Connecting and disconnecting CubicleBUS modules when energized is not recommended and can cause erroneous inputs or outputs to be generated.

Maximum CubicleBUS Configuration

The CubicleBUS can comprise up to 13 modules:

Electronic Trip Unit (ETU)

Metering Function Plus

Breaker Status Sensor (BSS)

COM16

BDA or BDA Plus

ZSI module

Digital output module with switch position to the left (1st module)

Digital output module with switch position to the right (2nd module)

Digital configurable output module

Digital input module with switch position to the left

Digital input module with switch position to the right

Analog output module with switch position to the left (1st module)

Analog output module with switch position to the right (2nd module)

In practice, however, not all of the modules may be required.

CubicleBUS Installation Guidelines

Total length of the CubicleBUS cables: max. 10 m

Prefabricated cables must be used to connect the CubicleBUS modules.

The last module on the line must be terminated with a 120 Ω terminating resistor (supplied with each module).

The cables must always be connected from module to module. Star connection is not permitted.

The power supply must be provided by a UL Listed 24V DC class 2 power supply with standard-tolerance and the properties described on

page 2/33 and 2/34.

Pin Configuration of the X3 on the CubicleBUS Module

X3.1 24V DC common

X3.2 CubicleBUS

Communications line -

X3.3 CubicleBUS

Communications line +

X3.4

24V DC +

Table 2-10At X3, the CubicleBUS can be supplied with 24V DC.

Figure

2-9

2/21

If external CubicleBUS modules are to be connected to the WL Circuit Breaker and a COM16 module is not available, the first connection must be made with four wires. The CubicleBUS can then be connected with the supplied CubicleBUS lines with RJ45 plugs, and the power supply connected to X3, as shown.

WL MODBUS Communication and Electronic Accessories • January 2005

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Siemens UL1066, UL 489 specifications Power Supply, Maximum CubicleBUS Configuration, CubicleBUS Installation Guidelines

UL 489, UL1066 specifications

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