Communication-capable Circuit Breakers

WL Circuit Breaker

The write-protect function ensures that all the required information can be transmitted, but prevents any changes to the status of the circuit breaker. Changes can then only be made locally.

Why does the write protection function permit certain actions?

All actions that are not blocked are for remote analysis only and do not have any effect on the current status.

Data Exchange via the COM16 Module

When the COM16 module is configured to exchange data, it is important to note that it is shipped as standard with MODBUS address 126. This can be changed during system configuration (e.g. with the BDA, WinPM.Net, WL Config software or ETU776 display).

The COM16 module has two LEDs (MODBUS and CubicleBUS) for diagnostic purposes. These indicate the operating status of the communication line and the CubicleBUS networks.

Two LEDs are used to determine whether a CubicleBUS module in the circuit breaker is operational. First, the "COMM" LED on the trip unit must be green, that is, the trip unit has recognized at least one other CubicleBUS module. At a minimum, this would only be the Metering Function PLUS if the CubicleBUS was then interrupted. Second, the CubicleBUS LED on the COM16 module must be taken into account. If this is lit with a steady green light, a connection exists from the COM16 module to at least the metering function Plus module.

If both LEDs are green (steady light for CubicleBUS on the COM16 module and COMM on the trip unit), communication is fully established between the trip unit and the COM16 module.

Data is exchanged according to the following principle: an up-to-date copy of all WL Circuit Breaker data (apart from the waveform buffer) is always stored in the COM16 module. A response to a data query from the COM16 module to the supervisory system can, be typically transmitted in just a few milliseconds. Write data from the supervisory system is forwarded to the appropriate addressee on the CubicleBUS.

 

 

Figure

Front view of the MODBUS module for the WL Circuit Breaker with the

MODBUS connection and the two LEDs. The figure below shows a section

2-1

of the ETU745 and its LEDs for displaying status.

 

 

 

 

 

Graphic

Rear view of the COM16 module. The RJ45 connection for the external

CubicleBUS modules can be clearly seen here. If no external CubicleBUS module

2-2

is connected, the bus must be terminated with the terminating resistor.

 

 

 

Meaning

Position and text on the cable

CubicleBUS -

X7.1

 

 

CubicleBUS +

X7.2

24V DC +

X7.3

 

 

24V DC ground

X7.4

Table 2-3The 4 black cables from the COM16 module must be connected to terminal strip X7, which is used to connect the COM16 module to the modules on the CubicleBUS in the circuit breaker.

2/10

WL MODBUS Communication and Electronic Accessories • January 2005

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Siemens UL 489, UL1066 Data Exchange via the COM16 Module, Meaning Position and text on the cable CubicleBUS, CubicleBUS +
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UL 489, UL1066 specifications

Siemens UL1066 and UL489 are essential components in the landscape of electrical equipment, specifically in circuit protection and control. These standards ensure reliability, safety, and efficiency in various applications, including industrial, commercial, and residential settings.

The Siemens UL1066 is primarily focused on disconnect switches. These devices are designed to isolate electrical circuits, ensuring the safety of both personnel and equipment during maintenance or in case of faults. One of the key features of UL1066 disconnect switches is their high breaking capacity, enabling them to handle significant fault currents without failure. This characteristic is crucial in protecting downstream equipment from damage caused by short circuits. The UL1066 switches are also known for their robust construction, often featuring a metal enclosure that enhances durability and environmental resistance. Additionally, these switches can be operated manually or remotely, offering flexibility in operation and control.

On the other hand, Siemens UL489 circuit breakers provide comprehensive protection against overcurrents and short circuits. These devices not only interrupt fault currents but also protect connected devices from damage due to overload situations. Key features of UL489 circuit breakers include adjustable trip settings, which allow users to customize the response to overcurrent conditions based on specific application requirements. This adaptability makes them suitable for a wide range of environments, from large industrial plants to smaller commercial buildings.

Both UL1066 and UL489 products are constructed with advanced technologies, such as thermal-magnetic or electronic trip mechanisms in UL489 devices, ensuring precise and timely interruption of fault currents. These technologies promote energy efficiency and stability within electrical systems. In addition, many of these devices are equipped with indication features, providing clear visual status cues for quick assessment in emergency situations.

In terms of characteristics, both UL1066 and UL489 devices adhere to rigorous testing and certification processes to meet UL standards. This compliance assures users of their performance and reliability. Furthermore, the devices are designed to accommodate a wide range of operating temperatures and environmental conditions, making them versatile choices for various applications.

In summary, Siemens UL1066 and UL489 devices are paramount in ensuring safety and efficiency in electrical circuits. Their advanced features and robust construction make them indispensable in protecting both personnel and equipment in an array of industrial and commercial applications.
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