Mitsubishi inverter is composed of many electronic parts, such as semiconductor components, etc., in the application and protection of the problem of replacing a related component, because of the composition or physical characteristics of the inverter, in a certain period of time will deteriorate, so that the characteristics of the inverter will be reduced, and even cause problems. Therefore, it is necessary to implement regular substitution for the sake of preventive protection. The inverter is replaced at a regular interval
1. Replace the cooling fan
The main circuit of the inverter is cooled by the semiconductor equipment to accelerate 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 in continuous operation, 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 sounds and abnormal oscillations are found.
2. Replace the capacitor
Large-capacity electrolytic capacitors are used in the central DC circuit, and their functions deteriorate due to the influence of factors such as pulse current. Deterioration is greatly affected by the ambient temperature and operating conditions, under normal circumstances, the service cycle is about 5 years, and the deterioration of the capacitor develops rapidly after a certain time, so the length of the week is one year, and the close life is less than half a year.
3. Replace the timer
The timer will change a lot after a few years of use, so replace it after checking the action time.
4. Replace the fuse
The rated current and load current of the fuse are large, and the life expectancy is about 10 years under normal operating conditions, and it is necessary to check the protection and even replace it 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 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 saturation voltage. The form factor requirements include external dimensions, terminal positions and device methods, 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 when replacing or restoring.
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 a running state, and when the machine is not running, it is necessary to properly keep the inverter.
1) Storage
The room should be dry, no direct sunlight, no corrosive gas, 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 around 40 °C, the storage period should not exceed 6 months; About 50°C, the storage period is not more than 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 correction of the energizing 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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