What s going on when the inverter is turned on and running at full capacity?

This is generally a problem with the wiring and parameter setting of the inverter, generally the FWD and COM of the inverter are shorted, and the "operation instruction **setting" in the inverter parameters is set to the external terminal.

It can reach the situation you are talking about. If you don't want the inverter to start when it is powered on, there are two solutions: one is to adjust the operating frequency of the inverter and adjust it to 0, so that even if the inverter is powered on, it will not run directly at full load; The second is to modify the "running instruction**" in the inverter parameters, and modify it to "control panel, so that if you set it, after the inverter is powered on, you need to press the run button of the inverter control panel before the inverter will start.

Which parameter to modify, you need to see the user manual of the corresponding inverter, and the parameters that need to be set are different for each brand of inverter.

First, the inverter start mode.

The start command of the inverter can be started by keyboard panel, terminal start and communication control.

The difference between the two is that the frequency of the inverter can be either a keyboard or a terminal, given in two ways.

1. The panel is manually set and the frequency is adjustable;

2. The terminal is an automatic or manual analog given or manual potentiometer.

Given. 3. Communication control.

To start the communication control, your PLC or HMI needs to connect the communication port with the communication terminal of the inverter, and then according to the communication protocol supported by the inverter.

Send frequency commands. The inverter side needs to set the communication parameters, and the PLC side needs to write the communication program and set the communication parameters.

Frequency converters. Second, the inverter.

Variable-frequency drive (VFD) is a power control device that uses frequency conversion technology and microelectronics technology to control AC motors by changing the frequency of the motor's working power supply.

The inverter is mainly composed of rectifier (AC to DC), filtering, inverter (DC to AC), braking unit, drive unit, detection unit, microprocessor unit, etc. The inverter relies on the interruption of the internal IGBT to adjust the voltage and frequency of the output power supply, and provides the required power supply voltage according to the actual needs of the motor, so as to achieve the purpose of energy saving and speed regulation. With the continuous improvement of industrial automation, frequency converters have also been widely used.

If the inverter is running at full capacity when the power is turned on, there may be several reasons:

Wrong parameter setting: If the parameter setting of the inverter is incorrect, it may cause the motor to run at full load at the beginning, and it is necessary to check whether the parameter setting is correct.

Motor failure: A motor failure can cause the motor to not start properly or to run at full capacity at the beginning. You need to check if the motor is normal.

Inverter failure: If the inverter is faulty, it may cause the motor to run at full load, and it is necessary to check whether the inverter is normal.

External interference: If the inverter is subjected to external interference, it may also cause the motor to run at full load, and it is necessary to check for external interference.

After ruling out the above reasons, if the problem persists, it is recommended to contact a professional for repair.

If the inverter is allowed to run without load, it can measure the voltage on the terminals of the inverter U, V, and W. Some brands of inverters, especially imported brand inverters, are generally not connected to the load and are not allowed to operate.

In addition, even if the voltage can be measured, the measured value may not be accurate. This is because the voltage waveform at the output end of the inverter is a PWM waveform, and the waveform of this PWM wave is very close to the square wave, but the multimeter is designed according to the sine wave filter, so there is no way to measure the relatively accurate voltage value by using some multimeters without harmonic filtering function. Green Wave Jet has done n such tests, after installing the MLAD-SW sine wave filter, it can measure the voltage value of the output end of the inverter relatively accurately.

Measured voltage waveform at the output of the inverter.

There is no load, there is a start command, there is a given speed, and the disassembly is correspondingly at the output end of the variable frequency travel width, and the voltage can be measured.

If there is no start command, or if the speed is 0 and the parallel is clear, then the voltage is also 0

Will the inverter burn when the inverter is loaded? Hello dear,!"After the inverter is powered off, the power transmission burns out, because the voltage stabilizing device in the inverter does not work, so it causes the instantaneous current overload to be too large once, resulting in burning, and the voltage stabilizing equipment should be inspected and repaired.

It is not allowed to cut off the power like this, and the control terminal of the inverter should be shut down. Many inverters are clearly stipulated that it is not allowed to disconnect the power supply of the inverter to achieve the purpose of stopping, the reason is that the inverter is short of socks every time the inverter is powered off and then powered on, the large capacitance in the inverter will be charged once through the charging resistor, and the frequent power failure and power-on are easy to burn the charging resistance inside the inverter. For example, ABB's inverter clearly stipulates that the inverter power supply can only be powered on 6 times at most in an hour.

In order to ensure that the inverter can be reliably powered off in an emergency, an incoming contactor can be set at the inlet end of the inverter. During normal operation, the terminal is controlled by the inverter to stop; In case of emergency, the incoming contactor is directly disconnected, so that the design is reasonable. Hope it helps!

Kiss. Hello <>

Variable frequency start can always carry the load and <>

Frequency conversion start can always carry the load, but the following points need to be noted: the rated capacity of the inverter: the rated capacity of the inverter refers to the maximum load current and power it can withstand, if it has a load greater than the rated capacity for a long time, it will lead to overload, overheating and other problems of the inverter, which will affect its life and stability.

Heat dissipation of the inverter: long-term load will cause the inverter to generate a lot of heat, so it is necessary to ensure that the heat dissipation of the inverter is good, otherwise the stability and life of the inverter will be affected. Characteristics of the load:

Different loads have different characteristics, such as large starting current, large inertia, sensitivity to voltage fluctuations, etc., and it is necessary to select the appropriate inverter and control mode according to the characteristics of the load to ensure its stability and reliability. Therefore, when carrying load for a long time, it is necessary to make reasonable selection and use according to factors such as the rated capacity, heat dissipation and load characteristics of the inverter, so as to ensure the stable operation and life of the inverter. <>

Variable frequency start refers to the use of frequency converter to control the starting process of the motor, by adjusting the rotation speed and torque of the motor, to achieve smooth start, Douhe to avoid the traditional direct start of the impact and damage to the power grid and equipment. The advantages of inverter start are: energy saving:

Variable frequency start can adjust the working state of the motor according to the change of load, and avoid energy waste due to excessive starting current. Protect the equipment: During the start-up process, the variable frequency start can smoothly bring the motor into the normal working state, avoiding the impact and damage of the motor and other equipment by the traditional direct start.

Reduced maintenance costs: Variable frequency starting can reduce the wear and tear of the motor during the start-up process, thereby reducing the maintenance cost of the equipment. High control accuracy:

The inverter can realize the precise control of the motor, and can adjust the speed and torque of the motor according to the actual demand to meet different production requirements. The disadvantages of variable frequency start are: high cost of equipment:

Variable frequency start requires the use of inverter and other equipment, which is higher than the traditional direct start equipment. High difficulty in operation and maintenance: Since the frequency conversion start requires the use of special equipment, it requires professionals to operate and maintain, and the operation and maintenance are difficult.

In short, variable frequency start is an efficient, energy-saving and reliable motor starting method, which can improve the service life and production efficiency of equipment, but it is necessary to pay attention to its cost and difficulty of operation and maintenance. <>

Dear, hello, the above questions have been answered for you, if you have other questions, please continue to ask, if not, please give a thumbs up! I wish you: a happy life and all the best.

Hello, no, frequency conversion start is a method of frequency conversion speed regulation of the three-phase AC power supply through the frequency converter, which can realize the smooth start and precise control of the motor, but in the process of frequency conversion start, the load of the motor should be wide and should be reduced as much as possible to avoid excessive load and damage to the motor and the frequency converter. Therefore, in the process of frequency conversion start-up, it should be avoided to carry large loads for a long time. After the motor is started, if you need to carry the load all the time, you need to match it according to the load size and the rated capacity of the inverter to ensure the normal operation of the inverter and the motor.

At the same time, during the operation of the motor, it is also necessary to pay attention to the running status and temperature of the motor, and check and maintain the motor and inverter in time to ensure its safe and reliable operation. If you need to be cautious of pin with large loads during the frequency conversion start-up process, you can consider using other start-up methods, such as direct start or star-delta start-up.

Summary. The excessive capacity of the inverter causes the following hazards to electrical equipment:

Dear to you! The following will give you the following to inquire about the impact as follows: 1. The harmonic current generated will directly cause the additional heating of the motor, so that the stator of the motor will exceed the rated temperature rise of the motor itself, so that the rated output capacity of the motor will be greatly reduced.

2. The current waveform output by the high-performance inverter is not a complete sine wave, which will increase the peak voltage of the motor, so that it directly affects the insulation level of the motor.

3. Harmonics will viciously circulate, causing additional torque to be generated in the output current component, resulting in a serious decrease in the output torque of the motor.

4. The increase in the carrier frequency component of the high-performance inverter caused by harmonic interference directly causes the vibration of the motor core and produces electromagnetic noise. Combining the above reasons, combined with the factors of safe electricity use, it is recommended not to use high-performance inverters and motors for long-distance connection control. Its cost is higher than the cost of overhead lines or buried power cables.

Does it matter if the output load of the inverter is too large?

Hello, I'm glad to answer your questions.

Does it matter if the output load of the inverter is too large?

The excessive capacity of the inverter will cause the following harm to the electrical equipment: pro-will! The following is the following for you to inquire about the impact:

1. The harmonic current generated will directly cause the additional heating of the motor, so that the stator of the motor will exceed the rated temperature rise of the motor itself, so that the rated output capacity of the motor will be greatly reduced. 2. The current waveform output by the high-performance inverter is not a complete sine wave, which will increase the peak voltage of the motor, so that it directly affects the insulation level of the motor. 3. Harmonics will viciously circulate, causing additional torque to be generated in the output current component, resulting in a serious decrease in the output torque of the motor.

4. The increase in the carrier frequency component of the high-performance inverter caused by harmonic interference directly causes the vibration of the motor core and produces electromagnetic noise. Combining the above reasons, combined with the factors of safe electricity use, it is recommended not to use high-performance inverters and motors for long-distance connection control. Its cost is higher than the cost of overhead lines or buried power cables.

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