The inverter is composed of many electronic parts, such as semiconductor components, etc., which involves the replacement of a related component in the application and protection, because of the composition or physical characteristics of the inverter, it will deteriorate in a certain period of time, which will reduce the characteristics of the inverter, and even cause failure. Therefore, it is necessary to carry out regular replacement in order to protect against it.
1. Replace the cooling fan
The main circuit of the inverter is cooled by the semiconductor equipment to speed up the heat dissipation and ensure the normal operation below the allowable Wendy. The life of the cooling fan is limited by the bearing, which is about 10000-35000h. When the drive is running continuously, the fan or bearing needs to be replaced once after a few years. The replacement period of the cooling fan is greatly affected by the ambient temperature, and the cooling fan must be replaced immediately when abnormal sound and abnormal oscillation are found.
2. Replace the capacitor
Large-capacity electrolytic capacitors are used in the central DC circuit, and their performance deteriorates due to factors such as pulse current. The deterioration is greatly affected by the ambient temperature and operating conditions, and under normal conditions, the service cycle is about 5 years, and the deterioration of the capacitor develops rapidly after a certain time, so the maximum viewing week is one year, and the final life expectancy is less than half a year.
3. Replace the timer
The timer will change greatly after several years of use, so replace it after checking the action time.
4. Replace the fuse
The rated current of the fuse is large and the load current is large, and the life expectancy is about 10 years under normal operating conditions, and it is required to check the protection or even replace it at this time.
5. Replace relays/contactors
After the relay and contactor reach a certain cumulative number of switching times, the contact defect will occur, which needs to be checked and replaced.
Secondly, knowing the meta-equipment that may need to be replaced, here is a brief addition to the basic requirements for replacing meta-equipment.
1) Find out the basic parameters and appearance of the equipment to be replaced. The basic parameters include the rated operating current, the capacitance of the capacitor, the resistance value of the resistor, the value of the GTR Darlington device (current amplification factor), the switching characteristics of the IGBT (including IPM) device, and the full voltage. The form factor requirements include external dimensions, terminal position and mounting form, etc., and then replace the required equipment according to the same requirements.
2) All connectors should be recorded or marked when disassembled to avoid misplacement during replacement or rehabilitation.
3) The contact surface between the power equipment and the radiator should be evenly coated with thermal grease and fastened with screws.
ultimately
In most cases, the machine is in operation, and when the machine is not running, the inverter needs to be properly stored.
1) Storage
The room should be boring, no direct sunlight, no corrosive gases, and no dust; The relative humidity is 20%-90% and there is no frost; The temperature is between -10 and 30 °C (if the temperature is about 40 °C, the storage period should not exceed 6 months; About 50°C, the storage period does not exceed 3 months).
2) Protection
Because the main circuit and control circuit of the inverter use more electrolytic capacitors, if not used for a long time, the leakage will increase, the withstand voltage will decrease, that is, accelerate the deterioration (the higher the temperature, the faster the deterioration), therefore, at least once a year, the external power supply is added, so that the repair power-on time is 30-60min, the characteristic is that only the inverter monomer is energized (do not have to be connected to the motor), and the input end of the inverter can be connected to the power supply.
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