1. Overpressure leads to brake pipe breakdown.
The so-called overvoltage of the inverter refers to the fact that the inverter voltage composed of various reasons exceeds the additional voltage, which is reflected in the DC voltage of the inverter DC bus.
The overvoltage alarm generally appears when the machine is stopped, and the main reason is that the deceleration time is too short or there is a problem with the braking resistance and braking unit.
2. Excessive surge voltage leads to insulation breakdown.
Cause: A surge voltage occurs when the resonance of the dispersive capacitance and dispersive inductance on the output line is superimposed on the output voltage. The higher the switching frequency of transistors and IGBTs, the longer the wiring, the higher the surge voltage, and at the maximum, the surge voltage can be twice the DC voltage.
Solution: Use a motor with high dielectric strength plus an AC output reactor (impedance of 3%) plus an output inductance L, capacitance C, resistance R filter.
3. The load of the inverter is suddenly disconnected, resulting in the breakdown of the module.
Reason: A contactor is installed at the output end of the inverter
Principle: During the normal operation of the inverter, the sudden and significant reduction of the load at the output will constitute a huge reverse electromotive force, which will act on the inverter, and when the electromotive force is large enough, it will lead to the breakdown of the module and even constitute an explosion.
For example, if the load is suddenly disconnected during the normal operation of the inverter, the motor with a large inductance will have self-induced electromotive force, and it will be superimposed in the same direction with the power supply voltage (the voltage output by the inverter) to form a high voltage, which has a small effect on the voltage of the two ends of the IGBT that is turned on, but it will constitute an overvoltage at the two ends of the IGBT in the reverse cut-off, and if the voltage is large enough, it will break down the IGBT.
Solution: Do not install a contactor at the output end of the inverter to maintain the load of the inverter so that it does not suddenly drop the load.
Fourth, three-phase rectification full breakdown
Case: A customer repaired the inverter, and found that the three-phase rectifier broke down during the inspection, and the missing phase detection plate was seriously burned out by the way. The inverter part and the other parts are normal.
Estimated reason: The input varistor is not broken, indicating that the power supply is a problem caused by the impact caused by excessive current.
In addition to the above four conditions, we will also encounter many problems about inverter breakdown (such as: inverter CPU breakdown) in daily use, in addition to the reasons listed above, there are also external inducements such as environmental humidity, metal dust and other external inducements that cause inverter breakdown, and these problems need to be further considered.
|
More on that
|
Applications of Reynolds frequency converters
A frequency converter is a power electronic device that can change the frequency of an AC power source to control the speed and output power of a motor. Inverters are widely used in industry, aviation, metallurgy, petroleum, chemical industry, electric power and other fields.
|
|
Reynolds universal inverter start-up mode
1. Direct launch
The universal inverter insists on starting at the beginning of the time according to the set starting frequency and starting frequency, and then accelerates to a given frequency according to the selected acceleration time
Second, the speed of the tracking start
Universal inverter ...
|
|
The difference between overload and overheating of the inverter – Reynolds
The inverter is an electric control equipment that uses frequency conversion technology and microelectronic technology to control and communicate the motor by changing the power supply frequency of the motor operation. The inverter is mainly composed of rectifier (AC to DC), filtering, inverter (DC to communication), braking unit, drive unit, detection unit ...
|
|
Characteristics of isolation transformer at the input end of AC power supply - Reynolds
a。 When the third harmonic and disturbance signals are severe, a barrier transformer can be used to eliminate the third harmonic and disturbance signals.
b。 The use of barrier transformers can generate new neutrals and avoid the abnormal operation of equipment due to defective neutrals in the grid.
...
|
|
The factor that causes the breakdown of the inverter – Reynolds
1. Overpressure leads to brake pipe breakdown.
The so-called overvoltage of the inverter refers to the fact that the inverter voltage formed due to various reasons exceeds the additional voltage, which is concentrated in the DC voltage of the inverter DC bus.
The overvoltage alarm generally appears at the time of shutdown, and its main ...
|
|
Servo drive failure and solution
1. When the servo motor of the robot is running at a very low speed, it is fast and slow, just like a creeping machine. Low-speed prostrate servo motors are usually caused by low system gain. Please adjust the parameter N.10.N.11.N.12 to adjust the system gain appropriately, or the automatic gain adjustment function of the running driver ...
|
|
Precautions for multiple motors in one inverter - Reynolds
Equipment selection
1. Inverter selection. When it comes to sizing, the first thing to consider is the operating conditions – whether one or more motors should be started or stopped at any time during the operation of the inverter.
If the motor does not need to be started at any time during the operation of the inverter, it may only be stopped or ...
|
|
The reason for using frequency conversion speed regulation - Reynolds
Variable frequency speed regulation can be used in most motor drag occasions, because it can provide accurate speed control, so it can easily control the rise, descent and variable speed operation of mechanical transmission. The use of frequency conversion can greatly improve the efficiency of the process (the variable speed does not depend on the mechanical part) and at the same time ...
|
|
AC servo motor with inverter control method - Reynolds
Because the inverter and servo are different in performance and function, and the use is not very different, it is not possible:
1) In the case of speed control and torque control, the general frequency converter is not very high, and there are also frequency converters that are used to react signals in the upper position to form a closed loop.
|
|
How to control the torque of the inverter vector according to the system - Reynolds
A brief introduction to the progress of the inverter in terms of torque:
This function adds the output voltage of the inverter so that the output torque of the motor is proportional to the square of the voltage, so as to improve the output torque of the motor. Improve the skill of insufficient torque at low speed output of the motor, and use the "vector manipulation" ...
|
|
Reynolds inverter control method
The actuator commonly used in the industrial field of Reynolds inverter has good speed regulation performance and simple and convenient operation method. Therefore, it is widely used in the automation system.
Typical wiring method for the main circuit of a Reynolds frequency converter
...
|
|
Reynolds drives use the most energy-efficient method
As an electronic electric, the inverter itself also consumes electricity (about 3-5% of the additional power). A 1.5 hp air conditioner consumes 20-30W of electricity, which is equivalent to the length of a lamp. The inverter works under the power frequency and has the function of saving electricity, which is practical.
But the conditions are:
At the top of the list, great success ...
|
|
Inverter power and box structure selection - Reynolds
First, the selection of inverter power
The system power is equal to the product of the inverter power and the motor power, and the system power is higher only when both are operating at a higher power. From the perspective of power, when selecting the power of the inverter, we should pay attention to the following points:
1) ...
|
|
Reynolds high-speed permanent magnet synchronous motor dedicated driver
The state proposes to "peak carbon emissions" by 2030 and complete "carbon neutrality" by 2060. Carbon neutrality is to try to reduce carbon dioxide emissions, and eventually achieve net zero emissions, that is, to make carbon dioxide emissions even offset.
However, due to economic development, CO2 emissions are stable ...
|
|
Safety precautions for low-voltage soft lift - Reynolds
Precautions for low-voltage soft starters
For cooling purposes, the soft starter must be installed in a straight direction.
In order to ensure excellent heat dissipation, there should be room for the soft starter device.
Main circuit selection ...
|
|
Reynolds soft starter troubleshooting methods
Common troubleshooting methods for Reynolds soft starters.
During the debugging process of the soft starter, the fault light is on, the motor is unresponsive, and the cause of the fault is analyzed:
When the starting mode adopts the live mode, the operation sequence is wrong (the correct operation sequence must first deliver the main power supply, and then the control ...
|
|
Precautions for installation of Reynolds low-voltage inverters
1. Safety precautions
1. The primary requirement is to have certain electrical professional knowledge, and understand the job site, understand the equipment status, and have certain electrical operation technology.
2. Determine the electrical ...
|
|
Features of the unit tandem inverter - Reynolds
(1) The multi-pronged PWM control method is selected, and the output voltage waveform is close to the sine wave.
(2) The rectifier circuit is multiplied, the number of pulses is as high as 36, the power factor is high, and the input harmonic is small.
(3) Modular design, compact structure ...
|
|
Operating procedures for Reynolds frequency converters
Bypass cabinet: The cabinet is equipped with high-voltage inlet and outlet isolation switches QS1 and QS2. Among them, QS1 is a single-pole single-throw variable frequency incoming knife switch, and QS2 is a single-pole double-throw power frequency and variable frequency outgoing knife switch. The bypass cabinet is a high-voltage environment, please investigate the status of the live display and electromagnetic lock to ensure safety before ...
|
|
Problems between the inverter and the motor – Reynolds
1. The power and temperature rise of the motor
Regardless of the method of the inverter, different degrees of harmonic voltage and current occur during operation, so that the motor runs under non-sinusoidal voltage and current. Rejection of material introduction, taking the sine wave PWM type inverter that is now widely used as an example, ...
|
|
Contact
working hours
