Because the application method is incorrect or the setting environment is unreasonable, the inverter will simply malfunction and cause problems, or the expected operation effect will not be satisfied. In order to prevent problems before they occur, it is important to carefully analyze the cause of the problem in advance.
1. How to check the inverter fault
Usually, the LED will display a problem code after the inverter outlet problem, and the information indicated by the problem code of each inverter is not the same, and the corresponding inverter manual needs to be checked. It will be very convenient to query the problem code online, and the fault information of the mainstream inverter on the market can be found through the system, and the WeChat public account "look at the industry" is attached to the WeChat public account, and the fault code of the inverter can be directly entered, and the corresponding problem information can be seen, and this function is free to use.
2. External electromagnetic induction disturbance
If there are disturbance sources around the inverter, they will invade the inverter through radiation or power lines, causing the misoperation of the control loop, resulting in abnormal operation or shutdown, and even damage to the inverter in severe cases. It is important to improve the anti-disturbance ability of the inverter itself, but because of the constraints of equipment cost, it is more reasonable and necessary to adopt the noise control method externally to eliminate the disturbance source. The following methods are specific methods to implement the "three noes" principle of noise disturbance: all relays around the inverter, the control coil of the contactor needs to be installed to avoid impulse voltage absorption equipment, such as RC absorber; Minimize the wiring interval of the control loop and separate it from the main circuit; The designated selection of shielded wire circuit shall be carried out according to the rules, and if the line is longer, a reasonable relay method shall be selected; The inverter grounding terminal should be carried out according to the rules, and should not be mixed with electric welding and power grounding; The input of the inverter is equipped with a noise filter to avoid disturbance from the power supply inlet.
3. Device environment
Inverters are electronic equipment and equipment, and there are detailed requirements for the equipment operation environment in their specifications. Under special circumstances, if these requirements cannot be satisfied, it is necessary to try to choose the corresponding pressing methods: oscillation is the main cause of mechanical damage to electronic equipment, and rubber and other vibration isolation methods should be used for occasions with large oscillation impact; Moisture, corrosive gases and dust will form electronic equipment rust, poor contact, insulation decline and short circuit, as a precautionary measure, the control board should be treated with anti-corrosion and dust-proof, and the closed structure should be selected; Temperature is an important factor affecting the life and reliability of electronic equipment, especially semiconductor equipment, air conditioning should be installed according to the environmental conditions required by the equipment or avoid direct sunlight.
In addition to the above three points, it is also necessary to regularly check the air filter and cooling fan of the inverter. For special cold occasions, in order to avoid the microprocessor from operating normally due to low temperature, necessary measures such as setting up space heaters should be adopted.
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Elements of LS power inverter operation
1. Physical environment
(1) Temperature factor
Temperature has a huge impact on the lifetime and reliability of the electronic components inside the inverter. When using the inverter in a high operating temperature environment, it is necessary to take additional cooling measures to ensure that the ambient temperature is stable in the inverter.
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Precautions for the selection of peripheral equipment for LS power inverter
The peripheral equipment of the inverter mainly includes cables, contactors, air switches, reactors, filters, braking resistors, etc. Whether the selection of the peripheral equipment of the inverter is correct and suitable also directly affects the normal operation of the inverter and the service life of the inverter.
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Inverter carrier frequency adjustment method - LS power generation
A． The output voltage of the SPWM inverter is a series of pulses, and the pulse frequency is equal to the carrier frequency.
B. In the current of the motor, there is a harmonic component with a strong carrier frequency, which will cause the vibration of the motor core and announce the noise. If the frequency of the noise is the same as that of the motor core.
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The main part of LS power inverter is composed
The inverter circuit is the first part of the inverter
The function of the DC central circuit is to smooth the output of the rectifier circuit to ensure that the inverter circuit and the control power supply can obtain a DC power supply with higher quality. When the rectifier circuit is the voltage flow of the central circuit, the primary component is the electrolysis of Darongtong ...
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Wiring method of the main circuit of the inverter - LS power generation
1. The power supply should be connected to the R, S, and T terminals of the VFD, and should not be connected to the VFD (U, V, W), otherwise the VFD will be damaged. It is necessary to clean up the trivial parts of the wire head after wiring, which may lead to abnormalities, failures, and failures, and it is necessary for the VFD to always be clean. When punching holes in the console, note that ...
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Selection of AC contactors in the field of building electrical - LS power production
1. The series and parallel connection application of contactors Many electrical equipment are single-phase loads, so several poles of multi-pole contactors can be used in parallel. Such as resistance furnaces, welding transformers, etc. When using several poles in parallel, a smaller capacity contactor can be used. However, it must be noted that after parallel ...
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Features of LS SUSOL series circuit breakers
Features of SUSOL series circuit breakers:
It can be used as the main switch of electrical equipment, and the limit breaking ability is high, Icu=Ics
Modular construction of circuit breakers: Tripper replacement (TS series) can be combined in a variety of combinations, such as ...
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Introduction of LS AC motors
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Motor & Electrical Control Technology Tips - LS Electricity Production
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3. Fuse: ...
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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 ...
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Inverter fault diagnosis - LS power generation
1. How to distinguish between heavy and light faults
When there is a problem with the light, the system announces the alarm signal and the fault indicator flashes. When there is a serious problem, the system will announce the problem indicator, the problem indicator will always be on, together announce the order to break the high voltage and stop closing, and store the problem ...
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Inverter air boost test step - LS power generation
1. Download the control program.
2. Put the inverter in open-loop experimental mode and set the appropriate parameters.
3. Connect the incoming cable of the inverter. The cable on the output side of the inverter is not connected.
4. Push the high-voltage cabinet to the experimental position, close the switch, and ...
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How does the interference of the frequency converter occur? -- Electricity production
To discuss the disturbance problem of LS inverter, we must first understand the operating principle of inverter, from the structural point of view, inverter is divided into direct inverter and direct inverter. The direct inverter is a communication that directly converts the I frequency current into a controllable frequency, and there is no intermediate DC link. Each phase of it ...
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Introduction of LS PLC programming software
LS PLC programming software is a professional PLC programming assistant tool, providing excellent interface, which can carry out PLC programming operations such as online modification, debugging and self-diagnosis, packing and debugging, etc., compatible with LG Master-K series and LG MASTER-K series, which can make you in the process of processing in a timely manner.
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LS static test to determine the fault of the inverter
Generally, the general-purpose inverter roughly includes the following parts: (1) rectifier circuit; (2) DC central circuit; (3) Inverter circuit; (4) Control circuit. The static test is mainly a test of the high-power transistors (power modules) of the rectifier circuit, DC center circuit and inverter circuit. Whole...
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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.
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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
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The touch screen controls the inverter steps
1. The touch screen is controlled by PLC inverter
1. At present, the general control of the inverter needs to use PLC to communicate with the inverter, read the information of the inverter, and then the touch screen communicates with the PLC in order to complete the control of the inverter to start, stop, and monitor the operation of the inverter.
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The meaning of servo in LS power production
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