Driver: Under the premise of carrying out frequency conversion skills, the servo drive has carried out more advanced control skills and algorithm operations than general frequency conversion in the current ring, speed ring and azimuth ring (the frequency converter does not have this ring) inside the drive, and it is much stronger than the traditional servo in terms of function, and the main point is to be able to carry out the best azimuth control. The speed and azimuth are controlled by the pulse train sent by the upper controller (of course, there are also some servos that integrate the control unit or directly set the parameters such as azimuth and speed in the drive through bus communication), and the algorithm inside the drive and faster and more advanced accounting and better electronic devices make it more superior to the inverter.
Motor: the data, structure and processing technology of the servo motor are much higher than that of the communication motor driven by the frequency converter (general communication motor or constant torque, constant power and other types of frequency conversion motors), that is to say, when the driver outputs the current, voltage, frequency change quickly of the power supply, the servo motor can be changed according to the power supply to produce echoing action changes, echo characteristics and anti-overload can be much higher than the communication motor driven by the frequency converter, the serious difference in the motor is also the fundamental difference between the two functions. That is to say, it is not that the inverter cannot output the power signal that changes so quickly, but that the motor itself cannot respond, so the corresponding overload setting is made in order to maintain the motor when the internal algorithm of the frequency conversion is set. Of course, even if the output capacity of the inverter is not set, there are some inverters with excellent functions that can directly drive the servo motor!
|
More on that
|
The power frequency motor is abnormally installed with an inverter - LS produces electricity
Installing a variable-frequency drive (VFD) on the power frequency motor can complete the accurate control and speed regulation of the motor, and improve the power and accuracy of the forward motor. However, if not properly equipped and used, it may cause the following hazards:
...
|
|
Precautions for the maintenance of the inverter of the tensile testing machine - LS generates electricity
In the course of regularly checking the variable-frequency drive (VFD) of the tensile testing machine, we can visually check the operating status directly from the outside.
(1) The ambient temperature is normal, and it is required to be between -10°C and +40 ...
|
|
Introduction of LS inverter IGXA series
LS inverter, the full name of LS AC inverter governor, converts direct current into alternating current by providing a variety of use configurations, and controls the speed of the motor by changing the voltage and frequency of the general power input to meet different industrial needs, so as to complete the energy saving and environmental protection of the automation system. ...
|
|
Debugging of basic parameters of inverter - LS power generation
There are many functional parameters of the inverter, and there are generally dozens or even hundreds of parameters for users to choose. In practice, it is not necessary to set and debug every parameter, and most of them only need to use the factory setting value. However, some parameters are very closely related to the application of practice, and some of them are still ...
|
|
Inverter harmonic calculation method - LS power generation
1. Method 1
Method 1: Fourier transform to obtain the amplitude and phase of each harmonic of voltage and current, calculate the active power of each harmonic according to P=√3UIcosφ, and add the active power of all harmonics to obtain the harmonic power.
Method 2: Measure the total active work ...
|
|
Advantages and disadvantages of LS inverter non-sensing vector control
The first generation of LS inverter selects the voltage frequency ratio scalar control method, which carries out frequency conversion speed regulation according to the linear ratio determined by the equivalent circuit of the asynchronous motor. Voltage refers to the effective value of the fundamental wave, and changing U/f can only regulate the steady-state magnetic flux and torque of the motor, not to mention dynamic control. In order to improve the low ...
|
|
Quickly locate switching power supply faults
Switch Mode Power Supply (SMPS) will cause the base of the switch tube to fail to get the switching pulse and intermittently operate due to the short circuit of the load, the failure of the self-vibration circuit and the loss of control of the protection circuit, which makes it difficult to locate the shortcomings of SMPS. Difficult to repair the work ...
|
|
The cause of the failure of low-voltage electrical appliances - LS power generation
In the control circuit of low-voltage electrical appliances, there are simple low-voltage components such as: buttons, safe, etc.; There are also slightly messy low-voltage electrical control components, such as circuit breakers, touch devices, time relays, thermal relays and other simple components, which makes it necessary to diagnose and analyze the cause of the problem.
...
|
|
How LS PLC works
Although many names such as relays, timers and counters are often used in the ladder diagram programs used by LS PLC, LS PLC does not have these hardware physically, but uses memory and program programming to do logic control and editing, and connects to external machines through output components.
|
|
LS power generation installs the switching power supply step
The basic method of switching the power supply of the device requires us to carry out the corresponding installation and debugging according to the specific model and the device environment. And in the process of installation, we need to pay more attention to safety and stability to ensure the normal operation of the switching power supply.
...
|
|
The essence and use of LS power PLC module
1. What is PLC?
PLC control system, Programmable Logic Controller, programmable logic controller, a digital operation of electronic devices specially designed for industrial production planning, it uses a class of programmable memory, used in its internal storage program, the execution of logic...
|
|
LS power converter interference phenomenon
1. As soon as the inverter of the heat exchange station is opened, the pressure transmitter jumps randomly;
2. Use the inverter to control the water supply, the pressure transformer is used as the signal to collect the pressure, and the pressure transformer is disturbed by the inverter;
3. When the inverter starts the motor, the voltage converter signal is unstable and beats violently;
4. Pressure transformer (4-20 ...
|
|
Introduction of LS power products
1. Power-related products: medium, low and high voltage electrical products;
(1) Low Voltage Products: Molded Case Circuit Breaker, Air Circuit Breaker, LS Contactor & Overload Relay, Miniature Circuit Breaker, Dual Power Automatic Transfer Switch, Intelligent Motor Protector, Manual Motor Starter, Surge Protection ...
|
|
The torque of the inverter is directly used as the controlled quantity mode - LS generates electricity
VVVF frequency conversion, vector control frequency conversion, and direct torque control frequency conversion are all one of the AC-DC-AC frequency conversion. Its common disadvantages are low input power factor, large harmonic current, large demand for energy storage capacitors in DC circuits, and renewable energy can not be reflected back to the grid, that is, it cannot carry out four-quadrant operation.
|
|
Introduction of LS AC motors
1. AC synchronous motor: that is, the rotor is composed of permanent magnet data, so after rolling, with the change of the stator rotation magnetic field of the motor, the rotor also changes the speed of the response frequency, and the rotor speed = stator speed, so it is called "synchronization".
...
|
|
Parameter setting of LS power inverter
Control method: i.e. speed control, rotation control, PID control or other methods. After adopting the control method, it is generally necessary to carry out static or dynamic identification according to the control accuracy and requirements. Low operating frequency: that is, the small speed of the motor running, when the motor is running at low speed, its heat dissipation function ...
|
|
The basic method and steps of inverter debugging - power inverter
1. No-load energizing test of inverter
1. Ground the grounding terminal of the inverter.
2. Connect the power input terminal of the inverter to the power supply through the leakage maintenance switch.
3. Check whether the factory display window of the inverter is normal, if it is incorrect, it should be reset.
|
|
Introduction to the working principle of LS electric molded case circuit breaker
Molded case circuit breakers are also known as equipment circuit breakers, all parts are sealed in plastic housings, auxiliary contacts, undervoltage trippers and shunt trippers are modular. Because of the very compact structure, the molded case circuit breaker is basically impossible to maintain. It is mostly manually operated, and the large capacity ...
|
|
Several basic functions of the inverter - LS generates electricity
The inverter mainly has the following functions:
1. Soft up
The direct launch of the inverter motor will have a severe impact on the power grid, and it will also have too high requirements for the capacity of the power grid, which is extremely unfavorable to the service life of equipment and power grid circuits.
|
|
The working principle of the LS power production module
When the LS power generation module is put into operation, its working process is generally divided into three stages, namely input sampling, user program fulfillment and output rewriting. The completion of these three phases is called a scan cycle. During the entire operation, the PLC's CPU repeatedly performs the upper ...
|
|
Contact
working hours
