1. Manually operate the work stop button of the inverter panel, investigate the work stop process of the motor and the display window of the inverter to see if there is any abnormal phenomenon.
2. If the inverter presents an overcurrent maintenance action during the process of starting P to abort the motor, the time to accelerate P deceleration should be reset. The acceleration of the motor during acceleration and deceleration depends on the acceleration torque, while the frequency change rate of the inverter during the start-up and braking process is set by the user. If the moment of inertia of the motor or the load of the motor changes, when the speed is increased or decelerated according to the preset frequency change rate, it may not be possible to accelerate the torque, and then the motor stall will be formed, that is, the motor speed is not in harmony with the output frequency of the inverter, and then the overcurrent or overvoltage will be formed. Therefore, the acceleration and deceleration times are reasonably set according to the moment of inertia and load of the motor, so that the frequency change rate of the inverter can be harmonized with the speed change rate of the motor.
The way to check whether this setting is reasonable is to select the acceleration and deceleration time according to the experience, and if there is an overcurrent in the starting process, the acceleration time can be appropriately extended; If there is an overcurrent during braking, the deceleration time is appropriately extended. On the other hand, the acceleration and deceleration time should not be set too long, and the time is too long will affect the production power, especially when the start and brake are frequent.
3. If the inverter is still maintained within a limited time, the working curve of the abort of the engine P should be changed, from a straight line to an S-shaped, U-shaped line or S-shaped and anti-U-shaped line. When the load inertia of the motor is large, a longer abort time should be selected, and the type of working curve should be set according to its load characteristics.
4. If the inverter still has working problems, you should try to increase the maintenance value of the maximum current, but the maintenance cannot be canceled, and at least 10%-20% of the maintenance margin should be left.
5. If the inverter still has a working problem, the inverter with a higher power should be replaced
6. If the inverter drives the motor to fail to reach the preset speed during the starting process, there may be two situations:
(1) The system produces electromechanical resonance, which can be judged from the sound of the motor working.
By setting the frequency runout value, you can avoid the resonance point. Generally, the inverter can set the three-level runout point. When the inverter controlled by VPf drives the asynchronous motor, in some frequency segments, the current and speed of the motor will oscillate, and the system will not work in severe cases, and even overcurrent maintenance in the acceleration process makes the motor unable to start normally, which is more severe when the motor is light load or the moment of inertia is small. Ordinary inverters are equipped with frequency hopping function, and users can set the hopping point and skipping width on the VPf curve according to the frequency point of the oscillation presented by the system. When the motor is accelerated, these frequency bands can be actively skipped to ensure that the system can work normally.
(2) The torque output of the motor can not work, and the factory parameter settings of different brands of inverters are different, and they are the same
|
More on that
|
The vector control mode of low-voltage general-purpose inverter - LS power generation
The method of vector control frequency conversion speed regulation is to change the stator current Ia, Ib, Ic of the asynchronous motor in the three-phase coordinate system, after the three-phase - two-phase change, equivalent to the communication current Ia1Ib1 under the two-phase static coordinate system, and then after the directional rotation according to the rotor magnetic field, it is equivalent to synchronous rotation sitting.
|
|
Models and features of LS Metasol series products
Metasol series MS (100A and below) products are newly launched and the primary product specifications: contactors, thermal relays, and center relays.
Features:
The body is small, the internal structure is sealed, and the safety factor is high
...
|
|
Introduction of plc inverter - LS power generation
Because the imported products of the inverter brand have their own PLC function, they mainly play an important role in the control effect of mechanical equipment, and play an important role in the equipment, which can regulate the operation and control of the machine and meet the requirements of users.
It should be scale
pLC ...
|
|
The selection principle of AC contactors - LS produces electricity
1. The voltage level of the AC contactor should be the same as the load, and the type of contactor should be suitable for the load.
2. The accounting current of the load should be less than or equal to the additional working current of the contactor.
The turn-on current of the contactor is greater than the starting current of the load, and the breaking current is greater than the load ...
|
|
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: 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 ...
|
|
The size of the contactor is selected by the type of contactor - LS produces electricity
1. Select the corresponding category of contactor according to the control object, operation times and application category of the contactor.
2. Select according to the rated voltage of the line at the application location.
3. Select the rated current of the main contact of the contactor according to the load capacity.
4. About the voltage level of the lead coil ...
|
|
LS has reached agreements with Doosan and Hanwha in Korea on a business model for vacuum power generation
LS Electric recently signed an MOU agreement with Doosan Fuel Cell, Hanwha Power Systems, and Hanwha Asset Management in Seoul, Korea, to establish a business partnership for city gas companies to develop a fuel cell-vacuum power generation business model. Through this agreement, the two sides will expand the scope of cooperation ...
|
|
LS power terminal is faulty
From the perspective of application, the function of the terminal block should be achieved: the contact part should be conducted, and the contact should be reliable. The insulating parts should not be conducted, and it is necessary to insulate them firmly. There are three common forms of fatal failure of terminal blocks:
...
|
|
The impact of power quality problems on frequency converters - electricity production
(1) Excessive voltage error will increase the loss of electrical equipment, shorten the life, and work abnormally, which will damage the stability of the synchronous operation of the power system, the stability of the voltage and the economic operation of the power grid, and will cause the inverter system to report overvoltage fault or undervoltage fault.
...
|
|
Introduction to wiring problems - LS power generation
1. Wiring of fire emergency lighting
Generally, the flame retardant wire is used to wear the metal pipe and the thickness of the protective layer is ≥ 30mm.
|
|
Recommended models for power production contactors
GMC-6 Contactor GMC-6 Rated voltage: 110V/22OV/380V;
GMC-9 Contactor GMC-9 Rated voltage: 110V/22OV/380V;
GMC-12 Contactor GMC-12 Rated voltage: 110V/22OV/380V;
GMC-18 Contactor GMC-18 Rated voltage 110V/ ...
|
|
Methods for extending the service life of inverters - LS generates electricity
1. The influence of electromagnetic disturbance on the inverter:
In the modern industrial control system, the microcomputer or PLC control technology is mostly selected, and in the process of system planning or transformation, it is necessary to pay attention to the disturbance of the inverter to the microcomputer control board. The inverter is disturbed by the outside world, because the user ...
|
|
How to select the inverter motor - LS produces electricity
Frequency conversion speed regulation motor is generally selected 4-level motor, the fundamental frequency operation point is designed at 50Hz, the frequency of 0-50Hz (speed 0-1480r/min) scale of the motor for constant torque operation, frequency 50-100Hz (speed 1480-2800r/min) scale of the motor for constant power operation, the entire speed regulation scale of (0 ...
|
|
Introduction of LS electric power contactors
How LS Contactor Works:
Generally, after the contactor coil is energized, the entire coil current will generate a magnetic field, which will make the core inside have electromagnetic attraction to attract the core, and let their communication contactor point action normally closed contact disconnect, or close, which ...
|
|
Briefly describe LS ABE203b molded case circuit breaker
The circuit breaker is a fundamental low-voltage electrical appliance, which has the function of overload, short circuit and undervoltage maintenance, and has the ability to maintain the line and power supply. Circuit breaker is an indispensable product in electrical safety. Due to different applications, there are molded case circuit breakers, frame circuit breakers, miniature circuit breakers, etc.
|
|
Manufacturing Automation Terminology – LS Electricity Generation
I/O Points:
When discussing control systems, I/O points are a term that is often heard. It refers to the input/output point, I stands for INPUT, which refers to the input, and O stands for OUTPUT, which refers to the output. The inputs/outputs are for the control system, and the input refers to the ...
|
|
The cause and inspection method of inverter overload tripping - LS power generation
1. The main reason for the overload of the inverter
(1) Malfunction, the current detection part inside the inverter has a problem, and the detected current signal is too large, resulting in tripping.
(2) The mechanical load is overloaded, and the main feature of the overload is that the motor heats up, and it can be ...
|
|
Introduction to inverter self-learning motor - LS power generation
1. What is a self-learning motor of inverter?
Enter the motor nameplate (voltage, current, Hz rating) in the inverter parameters, and then the inverter actively measures other parameters of the motor.
Second, why should the inverter learn by itself?
|
|
Precautions for inverter installation tips - LS power generation
When the line power supply exceeds the driver's kV-A rating by 10 times, add a line reactor.
A 3% impedance line reactor should be used to reduce power line transients caused by capacitor switching, line notching, DC bus overvoltage tripping, and inverter overcurrent and overvoltage conditions. Line...
|
|
Application of servo motor - LS power generation
Quick to use:
There are three cables necessary for the operation of the motor: power cable; Motor power line, motor encoder line.
Control line interface X5:
Servo enable necessary pin C24V power supply (7,41) Servo enable SR ...
|
|
Contact
working hours
