Servo Drive System and Variable Frequency Drive are two different types of drive systems, which have different applications and characteristics in the field of industrial automation. ATO online shop will go into detail about this topic.
VFD (Variable-frequency Drive) is widely used in industrial automation field to improve industrial production efficiency and save business cost. It is a kind of power control equipment to control AC motor by changing the working frequency of motor, which can realize the functions of soft starting, variable frequency speed regulation, improving the running accuracy, changing power factor, over-current/over-voltage/overload protection for AC asynchronous motor.
Customized equipment, also known as non-standard equipment, is a type of integrated automated equipment that is specifically designed as customers desire and not circulating on the market. In this video, we’re gonna show you a non-enclosure VFD that is specially built for custom-made equipment.
The variable frequency constant pressure water supply system takes the water pressure of the pipe network (or the user's water flow) as the setting parameter, and uses the pressure sensor to measure the water pressure in the water supply system, and then the pressure sensor will detect the signal 0-10V or 4~20ma signal. It is transmitted to the PID loop of the VFD, and after the VFD PID processing, the running speed of the water pump is adjusted according to the output frequency signal of the variable frequency drive, so as to realize the closed-loop automatic adjustment of the water pressure of the pipe network, so that the water pressure of the pipe network of the water supply system can be adjusted according to the setting.
A variable-frequency drive (VFD) is a type of motor drive used in electro-mechanical drive systems to control AC motor speed and torque by varying motor input frequency and, depending on topology, to control associated voltage or current variation. VFDs can be used to control AC motor speeds by changing the motor's frequency without sacrificing the output power of the motor. This is done by turning the speed pot (explained in section three) of an AC motor drive.
An induction motor is similar to a poly-phase transformer whose secondary is short circuited. Thus, at normal supply voltage, like in transformers, the initial current taken by the primary is very large for a short while. Unlike in DC motors, large current at starting is due to the absence of back emf. If an induction motor is directly switched on from the supply, it takes 5 to 7 times its full load current and develops a torque which is only 1.5 to 2.5 times the full load torque. This large starting current produces a large voltage drop in the line, which may affect the operation of other devices connected to the same line. Hence, it is not advisable to start induction motors of higher ratings (generally above 25kW) directly from the mains supply.
The working principle of the constant pressure water pump is as follows:
Generally, using PLC as an intermediate tool for HMI to control VFD is a good choice. Now, let’s us establish and HMI to control the VFD project. We need to communicate with an Omron PLC and use the PLC commands to control the VFD. Set the PLC model and communication parameters (RS232, Host Link communication protocol) that need to be communicated.
A programmable logic controller (PLC) or programmable controller is an industrial computer that has been ruggedized and adapted for the control of manufacturing processes, such as assembly lines, machines, robotic devices, or any activity that requires high reliability, ease of programming, and process fault diagnosis. A variable-frequency drive (VFD) is a type of motor drive used in electro-mechanical drive systems to control AC motor speed and torque by varying motor input frequency and, depending on topology, to control associated voltage or current variation.
A variable frequency drive (VFD) is a type of motor controller that drives an electric motor by varying the frequency and voltage of its power supply. The VFD also has the capacity to control ramp-up and ramp-down of the motor during start or stop, respectively. Even though the drive controls the frequency and voltage of power supplied to the motor, we often refer to this as speed control, since the result is an adjustment of motor speed. In this article, we will test VFD constant pressure water supply system.
HMI, short for human machine interface, is a medium for interaction and information exchange between systems and users, which realizes the conversion between the internal form of information and the form acceptable to humans. Human-machine interfaces exist in all fields that participate in the exchange of human-machine information. So, how do HMI and PLC control VFD?
Variable frequency drive (VFD) is a power control device that uses frequency conversion technology and microelectronics technology to control the AC motor by changing the frequency of the motor's working power supply. The variable frequency drive is mainly composed of rectification, filtering, inverter, braking unit, driving unit, detection unit and micro-processing unit. It adjusts the voltage and frequency of the output power supply by switching on and off the internal IGBT, and provides the required power supply voltage according to the actual needs of the motor, thereby achieving the purpose of energy saving and speed regulation. In addition, the VFD has many protection functions, such as overcurrent, overvoltage and overload protection, etc. Now, we will talk about ATO VFD analog output setting and wiring.
VFD is mainly composed of rectification (AC to DC), filtering, inverter (DC to AC), braking unit, drive unit, detection unit and micro-processing unit. The VFD adjusts the voltage and frequency of the output power supply by turning on and off the internal IGBT, and provides the required power supply voltage according to the actual needs of the motor, thereby achieving the purpose of energy saving and speed regulation. In addition, the inverter has many protection functions. Such as overcurrent, overvoltage, overload protection and so on. VFD is frequently used for speed regulation of AC motors or reducing the impact on the power grid on start-up.
Variable Frequency Drive changes the voltage of the motor power supply while changing the frequency of the motor power supply, so that the magnetic flux of the motor is kept constant, and the efficiency and power factor of the motor do not decrease in a wide speed regulation range. Because it is the ratio of control voltage (V) to frequency (F), it is called V/F control. And its V/F control features are simple control circuit structure, low cost, good mechanical properties and hardness, which can meet the smooth speed regulation requirements of general transmission.
The PLC program interlocks the forward and reverses the rotation of the motor to prevent the wrong touch of the motor's reverse rotation button. PLC and the VFD are powered on for 2s time control. After the motor stops, it needs to wait for 10s before the motor can be restarted. This is very practical in practical applications (there is a good buffer process for motor inertial motion).
Variable frequency drives (VFDs) have most commonly been used in water treatment plants, where they're used to regulate water flow. But in recent years, they've grown in popularity throughout many areas of the industry.
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This is because the structure of the inverter is AC-DC-AC. Whether single-phase 220V or three-phase 380V, the input AC power must first pass through a three phase rectifier bridge or a single-phase rectifier bridge to convert the AC power into DC power, and then use the point The capacitor filter is removed, and it becomes a DC power supply with relatively flat ripples. Next, the three-phase bridge-type urinal controlled by the chip converts the DC power supply into a three-phase AC power supply whose frequency and voltage can be controlled arbitrarily.
A pressure sensor is a device that can sense the pressure signal and convert the pressure signal into a usable output electrical signal according to a certain law. It usually consists of a pressure-sensitive element and a signal processing unit. According to different test pressure types, pressure sensors can be divided into gauge pressure sensors, differential pressure sensors, and absolute pressure sensors. ATO pressure sensor is the most commonly used sensor in the industry. It is widely used in various industrial automation environments, involving water conservancy and hydropower, railway transportation, intelligent buildings, production automation, aerospace, military, petrochemical, oil wells, electricity, ships, machine tools, pipeline and many other industries.
VFD is generally a power control device that converts a power frequency power supply into another frequency by using the on-off function of power semiconductor devices. The main circuit of the variable frequency drive can be roughly divided into two categories: the voltage type is a frequency converter that converts the DC of the voltage source into an AC, the filter of the DC circuit is a capacitor; the current type is a frequency converter that converts the DC of the current source into an AC, its DC loop filter is inductance.The following ATO will introduce you how to set 120V to 220V VFD panel
