Frequency inverters, or frequency converters, are a power control conversion device that is commonly used to control electric motors in wide ranges of speed operations. Frequency inverters change the frequency supply to the motor stator windings to achieve variable speed control purposes. Frequency inverters consist mainly of a rectifier (to change AC to DC), an inverter (to change DC to AC), drive unit, braking unit, filter and many more. The main circuit is controlled by the control circuit; AC power is changed into DC power by the rectifier, the rectifier circuit output is smoothened out by the DC intermediate circuit and then the DC power is converted by the inverter circuit into AC power again.
Frequency Inverter Troubleshooting
Frequency inverters are powerful tools in maintaining processes to solve frequency inverter performance issues using diagnostics and trouble shoot other related processes at the same time. By understanding how frequency inverters interact with the whole process, you can improve the overall production and quality of the product. The misapplication of the frequency inverter can cause many faults such as power issues, variation in the speed, the utility’s capacity switching and other mistakes which can bring about the failure of the frequency inverter. Make sure to evaluate the consistency as well as the condition of the processes when trying to determine the factors of the failure.
Frequency Inverter Basic Theory
When you understand the requirements of the load, applying a frequency inverter to a specific application is not a tough job. The frequency inverter should have good current capabilities for the motor so that it can produce the required torque for the load. Machine torque is typically independent of the speed of motor. You must constantly keep in mind that the load horsepower increases linearly with rpm.
Frequency Inverter Saves Energy Efficiently
Frequency inverters are one of the most successful equipment used by strategy managers to control the usage of electrical energy and minimize cost of utility. Energy use can reduce up to 50% when frequency inverters are incorporated into applications like pumps, fans and cooling towers by matching the speed of motor to the changing load requirements.