LXM32

3 Engineering

Initial speed of rotation: n = 4000 min-1

Rotor inertia: JR = 4 kgcm2

Load inertia: JL = 6 kgcm2

Selecting an external braking resistor

Calculation of the energy to be absorbed: EB = 1/2 * J * (2*π*n * 1/60)2

to 88 Ws

Electrical and mechanical losses are ignored.

In this example, the DC bus capacitors absorb 23 Ws (the value depends on the device type, see chapter "2 Technical Data").

The internal braking resistor must absorb the remaining 65 Ws. It can absorb a pulse of 80 Ws. If the load is decelerated once, the internal braking resistor is sufficient.

If the deceleration process is repeated cyclically, the continuous out- put must be considered. If the cycle time is longer than the ratio of the energy to be absorbed EB and the continuous power PPR, the internal braking resistor is sufficient. If the system decelerates more frequently, the internal braking resistor is not sufficient.

In the example, the ratio EB/PPR is 1.3 s. If the cycle time is shorter, an external braking resistor is required.

The selection is made in two steps:

The maximum energy during deceleration must be less than the peak energy that the internal braking resistor can absorb: (EDi)<(ECr). In addition, the continuous power of the internal braking resistor must not be exceeded: (PC)<(PPr). If these conditions are met, then the internal braking resistor is sufficient.

If one of the conditions is not met, you must use an external brak- ing resistor. The braking resistor must be rated in such a way that the conditions are met. The resistance of the braking resistor must be between the specified minimum and maximum values, since otherwise the load can no longer be decelerated or the product might be destroyed.

See chapter "2.3 Braking resistor", page 17 for technical data on the external braking resistors.

MNA01M001EN, V1.01, 08.2014

Common DC bus

35

Page 35
Image 35
Schneider Electric MNA01M001EN manual Selecting an external braking resistor

MNA01M001EN specifications

The Schneider Electric MNA01M001EN is a highly advanced solution designed to optimize energy management and enhance operational efficiency in various applications. As a crucial component in Schneider Electric's portfolio of energy management systems, the MNA01M001EN stands out due to its innovative features and robust technologies.

One of the main features of the MNA01M001EN is its seamless integration capabilities. The device supports interfaces such as Modbus, which allows it to connect to a variety of energy monitoring devices and systems. This interoperability ensures that users can easily connect their existing infrastructure without needing significant alterations, streamlining the energy monitoring process.

Another notable characteristic of the MNA01M001EN is its real-time monitoring capabilities. The device provides instant access to critical data, which enables users to make informed decisions regarding energy consumption. By continuously tracking energy usage, the MNA01M001EN facilitates timely interventions that can lead to substantial energy savings and improved operational performance.

In terms of technology, the MNA01M001EN employs advanced analytics to interpret energy data effectively. This feature empowers businesses to identify patterns in energy consumption, recognize inefficiencies, and make strategic adjustments. The use of predictive analytics also enables proactive maintenance strategies, minimizing potential downtime and optimizing resource allocation.

The MNA01M001EN is designed with user-friendliness in mind. Its intuitive interface simplifies navigation, making it accessible to a wide range of users, from energy managers to facility operators. Moreover, the device is equipped with customizable dashboards that allow users to visualize important metrics in ways that suit their specific needs and preferences.

In addition, the MNA01M001EN is built with sustainability as a core principle. By promoting energy efficiency, the device not only helps organizations reduce their carbon footprint but also leads to significant cost savings in energy bills. As organizations continue to prioritize sustainability, products like the MNA01M001EN play an essential role in driving those efforts forward.

Furthermore, its compact design allows for easy installation in various environments, making it a versatile choice for different types of facilities, whether industrial, commercial, or residential. The robust build quality ensures durability, allowing the device to withstand demanding conditions.

In summary, the Schneider Electric MNA01M001EN is an essential tool in modern energy management. With its integration capabilities, real-time monitoring, advanced analytics, user-friendly design, and commitment to sustainability, it represents a powerful solution for organizations looking to optimize their energy usage and enhance their operational efficiency.