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Lenze frequency converters have been industrial-grade systems with dynamic, high-performance machinery since the 1940s. Based in Germany, the company is a leading global supplier of drive and automation systems.
A frequency converter changes the input electrical frequency to achieve the desired outcome for the connected equipment. In this regard, Lenze frequency inverters can be categorized into several types, including:
This device rectifies the AC input and then inverts the resultant DC to AC of the required frequency and voltage.
While this converter does not need a rectifier or inverter, it can directly convert one voltage and frequency to another by changing the matrices' direction. It utilizes alternating current electric wave grids.
It steps up or down large power alternating current optically with low frequency by converting it to direct current and back to alternating current with a lower output frequency.
This type uses electronic devices to convert the frequency and voltage without mechanical elements. It has two-port networks insulating the two-ports electronic configuration to filter or transmit signals between two electrical circuits.
It contains a motor-generator-MG set that converts AC of one frequency to another. It means it comprises a drive motor that drives a generator to produce alternating current at the desired output frequency.
This device converts the power line signals into another signal of the desired frequency. An in-line frequency converter is connected between the line and load and can be used permanently or temporarily.
This frequency converter is based on switching at the resonant frequency to reduce component stress and increase efficiency. Its frequency is the natural output frequency, and the output is frequency-stepped down from the input frequency.
Lenze DC frequency converters are manually rectified DC, and their frequency is controlled using a thyristor on the inverter side. They have higher precision than regular AC machines, so they can't work on some applications like massive cranes and mills with high torque. For such applications, it is recommended to use Lenze frequency inverters instead of DC ones.
Lenze frequency converters are widely used to control electric motor speed and torque in industrial applications. Controlling the speed and torque of electrical motors in various applications increases production. In conveyor belt systems, fans, and pumps, the speed can be adjusted according to specific needs. The advantage of using these converters in industry is noted in the energy savings that result from operating the motors at optimal speed values.
Lenze frequency converters can also be used to synchronize different power systems with different frequencies. This makes it possible to integrate renewable energy sources such as solar and wind into the existing power grid. The frequency converter adjusts the output frequency of the renewable energy source to match the frequency of the power grid. This allows the renewable energy to be injected into the grid and used to supply electricity.
Lenze frequency converters can also provide grid power to remote and isolated areas. This makes them invaluable in mines, oil rigs, and remote communities. In these situations, the frequency converter can be powered by a diesel or gas engine. It adjusts the output frequency to match the required electrical equipment, such as pumps, lights, and communication systems.
Lenze frequency converters are also used in uninterruptible power supply (UPS) and energy storage systems. They help ensure a reliable power supply during outages and peak demand situations. In these systems, the frequency converter charges or discharges a battery or flywheel energy storage system to provide the required output power.
Lenze frequency converters are employed in energy generation from renewable sources, especially wind and hydro power. In wind turbines, the variable speed generator produces electricity at varying frequencies. The frequency converter adjusts the output frequency to match the electrical grid.
Lenze frequency inverters should be mounted on vertical panels to ensure even heat dissipation and optimal cooling. The ambient temperature should be between 0-40°C to allow proper ventilation around the inverter for effective heat dissipation. The distance between adjacent devices should be at least 1U space to allow airflow between devices. Never mount the inverter upside down or at an angle -always mount it vertically. Its enclosed design protects the internal components from dust and debris. This helps maintain optimal operating conditions and extend the lifespan of the inverter.
Avoid installing a Lenze frequency inverter in outdoor conditions where temperature and humidity fluctuate constantly. Don't place it in direct sunlight or near heat sources. Avoid installing in environments with corrosive chemicals or excessive vibration.
The Lenze frequency inverter is operated by an LCD display and numerical keypad. These control elements enable the user to adjust relevant operating parameters such as motor speed, torque, and acceleration. The display shows vital feedback data in real-time, such as operating frequency, voltage, and current, helping monitor performance.
The keypad can program the inverter according to specific application needs. For example, setting acceleration and deceleration rates to suit load requirements. This helps ensure smooth operation and reduces mechanical stress on connected equipment.
The ambient temperature should be between 0-40°C to allow proper ventilation around the Lenze frequency converter. Maintain a distance of at least 1U space between adjacent devices to ensure airflow. Never mount the inverter upside down or at an angle -always mount it vertically.
A DC motor runs on direct current, which means it has electrical connections at two commutating brushes mounted to a rotating part inside the motor. It provides a continuous and steady torque even when the speed reduces. This makes it suitable for varying applications like electric vehicles that need high torque at low speeds. On the other hand, an AC motor runs on alternating current and is more energy efficient. It doesn't have brushes, which reduces maintenance and wear.
A detailed analysis of the type of load the frequency converter will be driving should be conducted. Is it a motor or pump? Look into the power requirements in terms of voltage and current. Will there be any fluctuation in the power demand? AC motors are suitable for constant loads like fans and blowers. For variable loads like conveyor belts, either a DC or AC motor can be used.
Electric grading helps determine the ability or level of electrical equipment to withstand environmental conditions. It also helps identify types of frequent usage. UnderkW rating, torque, overload capacity, and efficiency, electrical grading provides a comparative guideline for Lenze frequency inverters and their proper usage in which space.
Lenze frequency converters utilize different control methods. The V/f control method is simple and cost-effective. It regulates the voltage applied to the motor relative to its frequency. In field-oriented control, the stator and rotor of the motor are controlled independently to achieve better torque and efficiency.
A1: Regularly cleaning the heat sinks and vents can help maintain optimal operating conditions and prevent overheating. Avoid placing the controller in direct sunlight or in environments with excessive heat.
A2: Frequent overheating or erratic behaviour, abnormal noise, and poor electrical output are signs that the frequency converter needs maintenance. If there are frequent electrical surges or power fluctuations, the device might also need frequent repairs.
A3: Lenze frequency converters are designed for indoor use. Outdoor environments can cause extreme fluctuations in temperature and humidity, leading to potential damage.
A4: When installed in remote areas, Lenze frequency converters allow electrical power generation and a reliable power supply to be maintained. They also help drive electrical motors, enhancing many mechanical industrial items.
A5: No. DC frequency converters can work with DC motors only, and AC frequency converters can work with AC motors only. When choosing one of the frequency converters, the type of motor it will work with should always be considered first.
