Setpoints, Minimum for Communicated Currents

Communication-capable Circuit Breakers

WL Circuit Breaker

Setpoints

In addition to the load management option (load shedding/load restore), the metering modules offer an option for an automatic monitoring of operating data and the generation of an alarm.

Two setpoints can be defined (e.g. for overvoltage). With the lower setpoint, an alarm can be generated via the setpoint value (e.g. > 410V), whereas, with a voltage increase, a tripping event (e.g. > 430V) can be generated.

Minimum for Communicated Currents

In order to avoid the detection, display and communication of very low currents generated by system noise, even with the circuit breaker in the disconnect position, the "Minimum for Communicated Currents" parameter offers the option of setting all detected current values smaller than this parameter to zero. The factory setting is 50A. This means that all values smaller than 50A are displayed as "0" on the display, interpreted as "0" for internal calculations (power) and also transmitted as "0" via the communications. If this parameter is changed to "0", this function is deactivated and all detected current measuring values will be directly used.

The parameter can be found in the parameter tree of the BDA.

Normal Positive Power Flow Direction

The measured real power is either assigned to a positive polarity (in normal direction) or a negative polarity (opposite normal direction). In contrast, the measured currents are always assigned a positive polarity.

With energy, the transmitted energy values are incorporated in two counters, real energy and real energy opposite to normal direction. The two energy counters are not assigned a polarity.

Event and Trip Log

All events (except for tripping events) are labeled with a time stamp and an ON (+) or OFF (-) indication and entered in the event log.

The event log has a depth of 10 events and works like a FiFo memory (first in, first out), i.e. the oldest event is deleted from the event log upon the occurrence of a new event.

The trip log is similar to the event log, however, only the last 5 trips are recorded with a time stamp and entered in the trip log.

Note: The event and the trip log are only available with the COM16 module.

The current direction of the energy "flow" and the question, "How much energy has, up to now, flowed in both directions?" is of particular interest for tie breaker applications. For a determination, it is important to define a "normal direction". This direction can either be "from top to bottom" or "from bottom to top".

Figure In the event log the last 10 events on the CubicleBUS are listed. The trip log

2-9contains the last 5 trips. Both of them can be displayed with the BDA.

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WL MODBUS Communication and Electronic Accessories • January 2005

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.

Siemens UL1066 Setpoints, Minimum for Communicated Currents, Normal Positive Power Flow Direction

Models: UL 489 UL1066