The inverter is composed of many electronic parts, such as semiconductor components, etc., and the problem of replacing a related component is involved in the operation and maintenance, 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 prevent maintenance.
1. Replace the cooling fan
The main circuit of the inverter is cooled by the semiconductor equipment cooling fan to speed up the heat dissipation and ensure the normal operation below the promised 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 it is necessary to replace the cooling fan 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, under normal conditions, the service cycle is about 5 years, and the deterioration of the capacitor develops rapidly after a certain time, so check the length of the circumference is one year, and the number of life is within 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 additional current of the fuse is large and the load current is large, and the service life is about 10 years under normal operating conditions, and it is necessary to check the maintenance and even replacement at this time.
5. Replace relays/contactors
After the relay and contactor reach the required cumulative number of switches, a contact defect occurs, and it is necessary to check and replace it. Secondly, knowing the meta-equipment that may need to be replaced, here is a simple make-up of 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 additional 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 shape requirements include the external scale, terminal position and device 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.
* In most cases, the machine is in operation, and when the machine is not running, it is necessary to take proper care of the inverter.
* In most cases, the machine is in operation, and when the machine is not running, it is necessary to take proper care of the inverter.
1) Storage
The room should be dry, no direct sunlight, no corrosive gas, 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) Maintenance
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 (without connecting the motor), and the input end of the inverter can be connected to the power supply.
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