In the long-term operation of the inverter, internal components may change or age due to the influence of temperature, humidity, dust, vibration, etc. In order to ensure the normal operation of the inverter, maintenance inspection and replacement of aging components must be performed. First, maintenance considerations 1. Only professionally trained personnel can disassemble the inverter and perform maintenance and component replacement; 2. Do not leave conductive materials such as metal in the inverter after repairing the inverter. Otherwise, the inverter may be damaged. 3. Before performing maintenance inspection, in order to prevent the risk of electric shock, please confirm the following items first: 1 The inverter has cut off the power supply; 2 The main control board charging indicator is off; 3 Use a multimeter or the like to confirm that the voltage between the DC bus has dropped to a safe voltage (DC 36V or less). 4. For inverters that are not used for a long time, use a voltage regulator to gradually increase the input voltage of the inverter until the rated voltage, otherwise there is danger of electric shock and explosion. Second, daily inspection and maintenance In order to ensure long-term reliable operation of the inverter, on the one hand, the inverter should be installed and operated in strict accordance with the usage method specified in the manual; on the other hand, the daily inspection and maintenance of the inverter should be done carefully. The daily maintenance items of the inverter are: 1. Is the operating parameter of the inverter within the specified range, is the power supply voltage normal? 2. Is the operation panel display of the inverter normal? Is the instrument indication correct, is there any vibration or vibration? 3. Is the cooling fan part operating normally, is there any abnormal sound? 4. Are the inverters and motors showing signs of abnormal noise, abnormal vibration and overheating? 5. Is there any abnormality such as overheating, discoloration, deformation, odor, noise, etc. in the inverter and the lead-out cable? 6. Does the surrounding environment of the inverter meet the standard specifications, is the temperature and humidity normal? Third, regular inspection The user performs a regular inspection of the inverter every 3~6 months according to the usage environment. When the inspection is regular, stop the operation first, cut off the power supply, and then open the casing for inspection. However, it must be noted that even if the power supply is cut off, it takes time to discharge the DC filter capacitor of the main circuit. After the charging indicator is turned off, use a multimeter to check that the DC voltage has dropped to the safe voltage (DC 25V). Check. Regular inspection items are: 1. Are the input and output terminals and copper bars overheated, discolored, and deformed? 2. Is the control circuit terminal screw loose, tighten with a screw driver? 3. Is there any damage to the input R, S, T and input U, V, W terminal blocks? 4. Is the R, S, T and U, V, W and copper row links secure? 5. Does the main circuit and control circuit terminal insulation meet the requirements? 6. Is the power cable and control cable damaged or aged? 7. In the place where the stain is damaged, wipe it with a rag with a neutral chemical agent; use a vacuum cleaner to suck off the dust on the circuit board, radiator, and air duct to keep the heat dissipation performance of the inverter good. 8. For the inverter that is not used for a long time, the charging test should be carried out to restore the characteristics of the electrolytic appliance of the main circuit of the inverter. When charging, use the voltage regulator to slowly increase the input voltage of the inverter to the rated voltage. The power-on time should be above 2H, without load, and the charging test should be performed at least once a year. 9. Insulation test of the inverter: firstly disconnect the connection line between the inverter and the external circuit and the motor, and reliably link the main circuit terminals R, S, T, P1, P+, DB, N, U, V, W with wires. It is normal to test the short wiring and PE terminal with DC 500W insulation resistance meter, and it is normal to display more than 5MΩ; do not conduct insulation test on the control circuit, otherwise the inverter may be damaged. Concerned about surprises Label: Inverter maintenance and inspection Previous: Common causes and countermeasures for electric motors Next: What are the methods for cooling tower maintenance? 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