The frequency converter is a power control device that uses the on-off function of a power semiconductor device to convert an industrial frequency power supply to another frequency, and has the functions of energy saving and speed adjustment, and can achieve the purpose of automatic control and high-precision control. In view of the important role played by the inverter in the tobacco industry, how to use and maintain the inverter properly, especially when the inverter is faulty, how to quickly detect and solve the inverter fault is particularly important. In the following, the author summarizes the use and maintenance methods of the frequency converter in combination with the actual situation.
1. Have a good grounding wire
The ground of the factory is rarely broken, but once it is broken, the inverter is easily burned. Because if there is a motor leakage, but also just cut off the ground of the factory, the strong power will be reversed through the inverter ground into the inverter motherboard, so that the motherboard terminals appear strong electric fire, burned the motherboard. Therefore, there must be a good grounding line.
2. Prevents the frequency converter from being disturbed
When the inverter is running, it looks like a powerful jammer. The source of the interference is on the six IGBTs of the output module. Some of the inverter's switching power supply can also cause some interference. The power line and motor line are the antennas of the jammer. If the ground line is bad, the interference signal can also be sent out through the ground of the shell. The longer the line is, the more the interference range is. Big.
Inverter interference signals not only interfere with surrounding electronic equipment, but also interfere with the frequency converter itself. Some inverters have the function of preventing the interference of signal radiation and input, and some inverters have no anti-jamming function. If the control system is using the inverter, there are some electronic devices that rely on analog signals and pulse signals for communication, such as computers, human-machine interfaces, sensors, etc. It is necessary to take anti-interference measures when selecting the inverter and wiring.
Preventing the frequency converter from being disturbed is a complex issue. It is necessary to adopt different methods in conjunction with the on-site situation. One is to add reactors, filters, control lines and magnetic rings. The second is the use of shielded wire. The third is to place the inverter in a metal cabinet. The fourth is to put the power cord in and out of the iron pipe. Fifth, the control line should not be routed together with the power cable. The wiring should be in an orderly and orderly manner. The sixth is to lower the carrier frequency. Seventh, there is a good grounding line, but it should be noted that many common drive control line terminals can not be grounded.
3. The varistor must be added to the air switch at the input of the inverter
The quality of the power supply of some enterprises is not very high. When the power supply line fails, the high-voltage output can easily burn out the inverter and related electronic equipment. In order to effectively solve this problem, passive protection methods can be adopted, that is, varistors (380V with 821K, 220V471K) are added to the air switch at the input end of the inverter or instrument. When high voltage electricity passes, the pressure sensitive effect will be short-circuited. The air switch trips, which protects the frequency converter and greatly reduces the frequency converter failure rate.
It should be emphasized that the varistor should not be too close to the inverter, because when the varistor is short-circuited and exploded, the generated metal debris will fly everywhere, and the powerful static electricity and electromagnetic waves emitted during the explosion will affect the function of the inverter. Breaking the copper wire of the circuit board will destroy the rectifier module, switching power supply, CPU board and capacitor, etc., so it is better to add varistors outside the inverter.
4. Try not to install the inverter on equipment with vibration
When the frequency converter is installed on the tobacco equipment with vibration (such as vibration tank, roller, etc.) for a certain period of time, the connection screws of the main circuit and the fastening screws of the module are easy to loosen, thereby shortening the service life of the frequency converter. When the equipment vibrates, the module of the inverter is most likely to be damaged. If the other modules are not reinforced after the module is replaced, the module will soon be broken again. So after installing the module, it is best to tighten the screws on the main circuit in order of current flow. If you must install the inverter around a device that has vibration, check the connection screws of the circuit and the fastening screws of the module regularly to prevent damage to the inverter due to loose screws.
5. Frequent maintenance frequency converter module
It is necessary to check the inverter module regularly, especially the maintenance of the cooling fan, because the cooling fan has high power and high rotation speed. In a dusty working environment, the vent hole of the radiator is likely to be clogged and the internal circuit board is dirty. Thermal grease failure, shortening the radiator life of the inverter. If the fan is broken and the protection temperature value is set too high, the inverter will not immediately jump overheat protection. At this time, the internal temperature of the entire inverter is very high, which can easily deteriorate the drive circuit and power circuit, and burn out the inverter module. If there are conditions, it is better to install the inverter in an air-conditioned room. This can reduce the chance of inverter failure and prolong the service life of the inverter.
It should be noted that the dust inside the inverter should be avoided by using compressed air as much as possible, because the compressed air generally contains water vapor, which can easily cause a short circuit in the circuit board and damage the power supply. Therefore, it is best to use a hair dryer to blow dust to the inverter.
6. Replace drive main board
The main fear of the inverter is that the motherboard is damaged. There are many causes of damage to the motherboard. For example, the ambient temperature is high, the static electricity is too much, the interference is great (such as a nearby contactor with frequent movements), the module explosion, etc. The strong electromagnetic wave, switching power supply failure is also It is easy to burn out the inverter board.
When the mainboard of the inverter has a fault, some display communication faults, some display normal but no output, and some have a maximum output and no control. The parameters can be restored to the factory values ​​for testing. If the parameters are still invalid or the parameters cannot be opened, the mainboard can only be replaced.
1. Have a good grounding wire
The ground of the factory is rarely broken, but once it is broken, the inverter is easily burned. Because if there is a motor leakage, but also just cut off the ground of the factory, the strong power will be reversed through the inverter ground into the inverter motherboard, so that the motherboard terminals appear strong electric fire, burned the motherboard. Therefore, there must be a good grounding line.
2. Prevents the frequency converter from being disturbed
When the inverter is running, it looks like a powerful jammer. The source of the interference is on the six IGBTs of the output module. Some of the inverter's switching power supply can also cause some interference. The power line and motor line are the antennas of the jammer. If the ground line is bad, the interference signal can also be sent out through the ground of the shell. The longer the line is, the more the interference range is. Big.
Inverter interference signals not only interfere with surrounding electronic equipment, but also interfere with the frequency converter itself. Some inverters have the function of preventing the interference of signal radiation and input, and some inverters have no anti-jamming function. If the control system is using the inverter, there are some electronic devices that rely on analog signals and pulse signals for communication, such as computers, human-machine interfaces, sensors, etc. It is necessary to take anti-interference measures when selecting the inverter and wiring.
Preventing the frequency converter from being disturbed is a complex issue. It is necessary to adopt different methods in conjunction with the on-site situation. One is to add reactors, filters, control lines and magnetic rings. The second is the use of shielded wire. The third is to place the inverter in a metal cabinet. The fourth is to put the power cord in and out of the iron pipe. Fifth, the control line should not be routed together with the power cable. The wiring should be in an orderly and orderly manner. The sixth is to lower the carrier frequency. Seventh, there is a good grounding line, but it should be noted that many common drive control line terminals can not be grounded.
3. The varistor must be added to the air switch at the input of the inverter
The quality of the power supply of some enterprises is not very high. When the power supply line fails, the high-voltage output can easily burn out the inverter and related electronic equipment. In order to effectively solve this problem, passive protection methods can be adopted, that is, varistors (380V with 821K, 220V471K) are added to the air switch at the input end of the inverter or instrument. When high voltage electricity passes, the pressure sensitive effect will be short-circuited. The air switch trips, which protects the frequency converter and greatly reduces the frequency converter failure rate.
It should be emphasized that the varistor should not be too close to the inverter, because when the varistor is short-circuited and exploded, the generated metal debris will fly everywhere, and the powerful static electricity and electromagnetic waves emitted during the explosion will affect the function of the inverter. Breaking the copper wire of the circuit board will destroy the rectifier module, switching power supply, CPU board and capacitor, etc., so it is better to add varistors outside the inverter.
4. Try not to install the inverter on equipment with vibration
When the frequency converter is installed on the tobacco equipment with vibration (such as vibration tank, roller, etc.) for a certain period of time, the connection screws of the main circuit and the fastening screws of the module are easy to loosen, thereby shortening the service life of the frequency converter. When the equipment vibrates, the module of the inverter is most likely to be damaged. If the other modules are not reinforced after the module is replaced, the module will soon be broken again. So after installing the module, it is best to tighten the screws on the main circuit in order of current flow. If you must install the inverter around a device that has vibration, check the connection screws of the circuit and the fastening screws of the module regularly to prevent damage to the inverter due to loose screws.
5. Frequent maintenance frequency converter module
It is necessary to check the inverter module regularly, especially the maintenance of the cooling fan, because the cooling fan has high power and high rotation speed. In a dusty working environment, the vent hole of the radiator is likely to be clogged and the internal circuit board is dirty. Thermal grease failure, shortening the radiator life of the inverter. If the fan is broken and the protection temperature value is set too high, the inverter will not immediately jump overheat protection. At this time, the internal temperature of the entire inverter is very high, which can easily deteriorate the drive circuit and power circuit, and burn out the inverter module. If there are conditions, it is better to install the inverter in an air-conditioned room. This can reduce the chance of inverter failure and prolong the service life of the inverter.
It should be noted that the dust inside the inverter should be avoided by using compressed air as much as possible, because the compressed air generally contains water vapor, which can easily cause a short circuit in the circuit board and damage the power supply. Therefore, it is best to use a hair dryer to blow dust to the inverter.
6. Replace drive main board
The main fear of the inverter is that the motherboard is damaged. There are many causes of damage to the motherboard. For example, the ambient temperature is high, the static electricity is too much, the interference is great (such as a nearby contactor with frequent movements), the module explosion, etc. The strong electromagnetic wave, switching power supply failure is also It is easy to burn out the inverter board.
When the mainboard of the inverter has a fault, some display communication faults, some display normal but no output, and some have a maximum output and no control. The parameters can be restored to the factory values ​​for testing. If the parameters are still invalid or the parameters cannot be opened, the mainboard can only be replaced.
Plastic molding processing equipment is developed on the basis of rubber machinery and metal die casting machine. Since the emergence of polymer injection molding process and simple molding equipment in the 1870s, as an industry, until the 1930s to obtain rapid development, plastic molding processing equipment gradually commercialized, injection molding and extrusion molding has become an industrial processing method. Blow molding is second only to injection molding and extrusion of the third largest plastic molding method, is also the fastest development of a plastic molding method.
Mold Temperature Controller,Mould Temperature Controller,Mold Temp Controller,Injection Molding Temperature Controller
Ningbo Haijing Plastic Machine Manufacturing Co. LTD , https://www.chinahaijing.com