Overcurrent or overload of the inverter is a common problem of the inverter, and overcurrent refers to the value of the current flowing through the inverter beyond its additional range.
1. If the power supply of the inverter is out of phase, the circuit at the output end is disconnected, or the motor winding has a short-circuit to the ground, it may lead to overcurrent.
2. The sudden change of motor load may lead to a large impulse current flowing through the inverter, and then forming an overcurrent maintenance phenomenon. After restarting the inverter, the problem will return to normal. If the drive is frequent, the load should be checked or the larger capacity drive should be replaced.
3. Electromagnetic disturbance will affect the circuit of the motor or inverter, and the inverter will produce a lot of disturbance electromagnetic waves around it because of rectification and frequency conversion in the operation, and these high-frequency electromagnetic waves will have a certain disturbance to nearby instruments and instruments. In the same way, if the peripheral electromagnetic waves disturb the motor, the leakage current in the motor will be too large, causing the overcurrent maintenance of the inverter; If electromagnetic waves disturb the inverter, it may cause the control signal output of the inverter to be incorrect, and then lead to overcurrent.
4. In the process of motor operation, between the winding and the shell, between the cable and the earth, a large parasitic capacitance will be generated, and the current will flow to the earth through the parasitic capacitance (leakage current), and then cause the phenomenon of overcurrent.
5. When the capacity of the inverter is not selected properly, or the capacity of the load does not match, it may cause the inverter to operate abnormally, and then there will be overcurrent or overload, and even damage the inverter.
6. Overload faults include inverter overload and motor overload. Most of the reasons for overload problems are that the acceleration time is too short, the DC braking force is too large, the grid voltage is too low, and the load is too heavy. An overload is when the selected drives and motors cannot drag the load.
|
More on that
|
It is hoped that Senlan will become the most powerful shore power solution provider in China
Founded in 1998, Hope Lansen is a national high-tech enterprise in the fields of energy conservation and environmental protection, new energy, transmission control and intelligent equipment in China, integrating R&D, manufacturing, system integration and customer service. Its products cover high and low voltage frequency conversion control systems, automated production lines and robot transmission systems.
|
|
The key points of the use of inverter - Sunland inverter
In order to ensure the safe, efficient and reliable operation of the inverter, the following keys should be grasped when using the inverter:
1) It is necessary to reliably ground the grounding terminal of the inverter, so as to effectively press the radio frequency disturbance and enhance the reliability of the system.
|
|
Introduction to the inverter maintenance and energizing test - Senlan
First, the inverter is not repaired and the power test is tested
(1) Inverter repair test rectifier circuit
At the two ends of the inverter to detect the internal DC power supply, P and N ends, adjust the multimeter to the resistance RX10 gear, the red watch pen is connected to the P end, and the black watch pen is connected to R, S, T in turn.
|
|
Hope Senlan inverter selection
Hope Sunland inverter is a high-performance inverter product, which has high operational reliability, high energy efficiency, strong control performance and long service life. Hope Sunland inverter has been widely used in industrial process production control, machinery control, water treatment, construction and transportation and other fields. This article will start with ...
|
|
The inverter is different from the inverter power supply - Senland
In terms of power supply, everyone may know that the inverter and the inverter power supply are auxiliary equipment for charging electrical appliances, but many people do not know what is the inverter power supply and what is the inverter. With the continuous progress of the times, electrical appliances will be constantly updated, and auxiliary equipment is constantly changing.
|
|
The difference between vector and general use of frequency converter
1. The control accuracy of the vector type is higher than that of the general type.
2. The vector type has a large output torque at low speed, which can make the motor get a larger starting torque, and is suitable for use in the occasion of heavy load starting, such as: high-power long belt, hoist, etc. If it is used in some of the more common fields ...
|
|
Repair and maintenance of Sunland inverter
The input and output currents of the inverter contain many higher harmonic components. In addition to the lower harmonics that can constitute the reactive power loss of the power supply, there are many harmonic components with high frequencies. They will transmit their own energy in various ways, forming a positive impact on the inverter itself and other equipment.
|
|
Sunland inverter is used in Baotou steel water supply
In recent years, with the development of power electronics skills, the frequency conversion speed regulation skills have been very mature, practice has proved that the use of frequency conversion speed regulation in fans, pumps and loads can save 20%-50% of the electric energy, and the use of frequency conversion speed regulation can bring the following advantages in the future, its biggest advantage is that it has ...
|
|
The comprehensive application of Sunland's high-power boiler feed pump has added another classic
Recently, the "General Contracting Project of Boiler Feed Pump Frequency Conversion Technology Transformation Project of Yili Power Plant of Guoshen Group" undertaken by Hope Sunland has been successfully implemented and connected to the grid, adding another classic to the comprehensive application of Sunland's high-power boiler feed pump.
In 2020 ...
|
|
Inverter selection according to capacity matching - Senlan
We need to ensure that the capacity of the inverter is matched. First of all, according to the nature of the load, the correct type of inverter is selected. The general principle is what nature of the load characteristics with what characteristics of the inverter.
(1) Constant torque production equipment - in the speed regulation range ...
|
|
Common brand inverter modification power method - Senlan inverter
What are the advantages of inverter power correction? Many brands of inverter power boards, driver boards, and motherboards can be universal, as long as the type, volume, and hardware are the same, and the desired power and voltage value can be obtained by correcting the manufacturer's parameters.
...
|
|
What are the protection functions of the inverter - Sunland inverter
1. Incoming line maintenance
Incoming maintenance is the maintenance of the user's inlet end and inverter, including lightning protection maintenance, grounding maintenance, phase loss maintenance, inverted phase maintenance, unbalance maintenance, overvoltage maintenance, transformer maintenance and so on. These maintenance devices are generally installed at the input of the inverter ...
|
|
The difference between a voltage signal and a current signal
The general voltage in industry is 0... 5(10)V or current 0(4)... 20mA is used as an analog signal transmission method, and it is also a method often used by program control machines. So what is the difference between the transmission method of voltage and current, and when to choose what method, the following will be briefly introduced.
|
|
I/O (Input/Output) Selection – Senland
In the 90s of the 20th century, PLC has formed a variety of PLCs: micro, small, medium, large and giant. According to the number of I/O points, it can be divided into five types: micro PLC (32 I/O), small PLC (256 I/O), medium PLC (1024 I/O), large PLC (4.69 I/O), and giant PLC (8195 I/O).
...
|
|
Application of Sunland inverter in sugar separator
First, the operation of the machine before the technical transformation
The sugar separation process of a sugar factory in Yunnan uses centrifugal dehydration method. The separation machine is mainly composed of a cone drum and a drive motor, and the motor shaft is directly connected to the bowl. Solid sugar crystallized from a high concentration of sugar water, in a cone bowl ...
|
|
Fault signal processing method of frequency converter
(1) Check whether the motor is hot.
If the temperature rise of the motor is not high, you should first check whether the size of the load, the acceleration and deceleration time, and the running cycle time are reasonable, and correct the V/F characteristics, and check whether the electronic thermal protection function of the inverter is preset reasonably, such as the inverter.
|
|
Sunland attended the 2015 Industrial Automation Exhibition in Nuremberg, Germany
November 24, 2015 - November 26, 2015, "Germany Nuremberg Industrial Automation Exhibition" was successfully carried out at the Nuremberg International Exhibition Center in Germany, and it is expected that Sunland as a domestic professional inverter manufacturer also participated in the exhibition, in this exhibition, in addition to the usual SB70, ...
|
|
Introduction to inverter capacitors - Sunland inverter
1. The capacitance is generally indicated by "C" plus a number in the circuit (e.g., C25 indicates the capacitance numbered 25).
A capacitor is a component consisting of two metal films close to each other and separated by an insulating material in the center. The characteristic of the capacitor is mainly to communicate through the DC block. The size of the capacitance is ...
|
|
Precautions for inverter selection and capacity matching - Senlan
1. Select the inverter according to the load characteristics
Second, when selecting the inverter, the current value of the practical motor should be used as the basis for the selection of the inverter, and the rated power of the motor can only be used as a reference. Secondly, it should be fully considered that the output of the inverter contains higher harmonics, which will form the power factor of the motor.
|
|
Inverter protection and braking force issues – Sunland
1. What is regenerative braking?
If the motor decreases the command frequency during operation, the motor becomes an asynchronous generator and works as a brake, which is called regenerative (electrical) braking.
2. Can you get more braking power?
Regenerated from the motor ...
|
|
Contact
working hours
