Energy feedback device suppliers remind you that in industrial production, frequency conversion control cabinets (frequency converter electrical control cabinets/electrical control cabinets) can be widely used in various medium voltage motor equipment such as pumps, fans, air compressors, rolling mills, injection molding machines, belt conveyors, etc. in metallurgy, chemical, petroleum, water supply, mining, building materials, and motor industries.
The frequency converter is a major component of the variable frequency control cabinet and variable frequency control box, and even some PLC control cabinets use it. The frequency converter is also known as a variable frequency drive or drive controller. The frequency converter is a type of adjustable speed drive system that applies variable frequency drive technology to change the frequency and amplitude of the working voltage of the AC motor, in order to smoothly control the speed and torque of the AC motor. The most common type is an AC/AC converter with AC input and output.
In the frequency conversion control cabinet and frequency conversion control box, it is an essential component. Although it is a small individual, it contains a great role. So what are its functions and characteristics in the control cabinet? Let's take a look!
1、 Characteristics of frequency converter
(1) Adopting multiple PWM control methods, the output voltage waveform is close to a sine wave.
(2) The multiplexing of rectifier circuits results in up to 36 pulses, high power factor, and low input harmonics.
(3) Modular design, compact structure, easy maintenance, and enhanced product interchangeability.
(4) Direct high-voltage output without the need for an output transformer.
(5) Extremely low dv/dt output, no need for any form of filter.
(6) The use of fiber optic communication technology has improved the anti-interference ability and reliability of the product.
(7) The automatic bypass circuit of the power unit can achieve the function of not stopping the machine in case of faults.
2、 The function of frequency converter
1. Adjustable torque limit
2. Reversible operation control
3. Reduce mechanical rotating parts
4. Controllable acceleration function
5. Control the starting current of the motor