Communication-capable Circuit Breakers

WL Circuit Breaker

Digital Input Module

Functional description

The digital input module enables up to six additional binary signals (24V DC) to be connected. Signals, such as the status of the breaker, the status of the switchgear cabinet door, or a signal indicating that a predefined temperature has been exceeded, can be transmitted directly and processed at the field bus level.

A total of 6 inputs are available in the "BUS Input" Switch position. Six inputs are also available if the rotary switch is in the "Parameter Switch" position, although the first input causes the active parameter set to change. If the connected ETU does not have two parameter set capablity (e.g. ETU745 or ETU748), this input can also be used without any restrictions.

Functional description for changing parameter sets

Trip units ETU755 and ETU776 have two different parameter sets for the protection function. This function is particularly useful in the event of a power failure when an automatic transfer is made from utility to generator, a process which may require that all the protective functions change.

The MODBUS communication system, the BDA, the ETU776 display, or the digital input module can be used to switch between the two parameter sets.

For this purpose, the first module input is used in the "Parameter Switch" position on the rotary switch. If a "1" signal is detected (LED on input 1 is yellow), the switchover to parameter set B is communicated to the trip unit. If the input signal switches back to "0", the switchover to parameter set A is communicated, and the LED on input 1 is de-energized.

Since the CubicleBUS is event controlled, trip unit ETU755 or ETU776 switches over to the other parameter set when a switchover request is issued via the CubicleBUS.

This means that if a switchover is made to parameter set B via the BDA, for example, even though the input on the digital input module is set to "0" (parameter set A), the active parameter set in the trip unit switches to parameter set B. A switchover event to parameter set A is not initiated on the CubicleBUS until the input on the digital input module is set first to "1" and then back to "0".

A maximum of two digital input modules can be operated simultaneously on one WL Circuit Breaker: one as a module with the "BUS Input" position and the other as "Parameter Switch" mode.

Figure

The position of the rotary

switch determines the

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operating mode.

 

Technical data for the digital input module

Operating voltage min. / max.

19.2V / 28.8V

 

 

Operating current min. / max.

29mA / 43mA

 

 

No. of channels per digital input module

6

 

 

Min. voltage value for detecting a "1" signal

>16V

 

 

Current per input for a "1" signal

7.5mA

 

 

Max. voltage value for detecting a "0" signal

<1V

 

 

Current input per input for a "0" signal

0mA

 

 

Max. no. of digital input modules per breaker

2

 

 

Power min. / max.

0.72W / 0.94W

 

 

Dimensions W / H / D

70 mm / 86mm / 95 mm

 

 

Weight

0.223 kg

 

 

Operating temperature range

-20°C / 60°C

 

 

Table 2-15This table provides accurate technical data for the digital input module on the CubicleBUS.

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WL MODBUS Communication and Electronic Accessories • January 2005

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Siemens UL 489, UL1066 specifications Digital Input Module, Functional description for changing parameter sets

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.