Question 1. Why use a VFD to control the motor?
Speaking of this question, let's first take a brief look at these two devices. The motor is a rational load, which hinders the change of current, and a large change in current will occur when it is started. VFD, which is actually composed of a rectifier inverter circuit, turns the motor's power supply into a power supply with adjustable frequency.
In order to reduce the starting current of the motor, especially the high-power motor, the higher the power, the greater the starting current, which will bring a greater burden to the power supply and distribution network, and VFD can deal with this starting problem, so that the motor can start smoothly and will not cause excessive starting current.
Another feature of using a VFD is to speed up the motor. In many occasions, it is necessary to control the speed of the motor to achieve better production power, and VFD speed regulation is always its biggest highlight. The VFD can change the frequency of the power supply to control the motor speed.
Q2: How does the VFD control the motor?
The wiring of the VFD control motor is relatively simple, similar to the wiring of the contactor. Three mains power supplies are connected to the motor, which is then connected to the motor. However, the VFD operating mode is also set differently.
First, let's take a look at the VFD terminal. Although there are many brands and different wiring methods, most of the terminals of VFDs are not much different. Generally, it is divided into positive and negative switch inputs, which are used to control the positive and negative starts of the motor. The reaction terminal is used to reflect the operation status of the motor, including the operating frequency, speed, fault status, etc. Given the speed control, some VFDs use potentiometers, and some directly use buttons, all of which are impassable.
The above method is controlled by physical wiring, and the other way is through the communication network. Many VFDs now support communication control. You can control the start and stop of the motor, forward and rotation, speed conditioning, and more. Through this communication line, the reaction information is also transmitted through communication.
Q3: What are the advantages of VFD control motors?
The advantages of the VFD control motor are also mentioned above. Here's a summary.
First, the start is stable, and the suspension is stable. The full-voltage direct start will directly generate an instantaneous current of seven or eight times the rated current, and the VFD controls the starting voltage and frequency of the motor, so that the motor starts from 0 little by little, and the starting time and abort time can be set. From the abort condition to the set speed, it is possible to set a fixed moment to start or stop the motor at a constant speed.
Second, the speed is adjustable. Speed regulation is also one of the reasons to use VFD. In the manufacturing process, we will adjust the motor speed according to the power requirements, and VFD will adjust the motor speed by changing the frequency.
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