1. Regularly dust the inverter, focusing on the rectifier cabinet, inverter cabinet and control cabinet, if necessary, the rectifier module, inverter module and the circuit board in the control cabinet can be removed for dust removal. Whether the lower air inlet and upper air outlet of the inverter are dusty or blocked due to excessive dust. Due to the large amount of ventilation required for heat dissipation of the inverter, after a certain period of operation, the dust on the surface is very serious, and the dust must be cleaned regularly.
2. Open the front door of the inverter, disassemble the back door, carefully check whether the AC and DC busbars are deformed, corroded and oxidized, whether the screws at the busbar connection are loose, whether the screws at the busbar connection are loose, whether the solid screws at the installation fixing points are loose, and whether the insulating sheet or insulating column for fixing is aging, cracked or deformed.
3. After removing the dust of the circuit board and busbar, carry out the necessary anti-corrosion treatment, paint the insulating paint, and remove the burrs of the busbar that has been partially discharged and arced, and then deal with it. For the insulating board that has been insulated and broken down, the damaged part must be removed, and the insulating board of the corresponding insulation grade shall be used near the damage, and the insulation shall be tightened and tested and considered qualified before it can be put into use.
4. Whether the fan operation and rotation in the rectifier cabinet and inverter cabinet are normal, when the machine is stopped, rotate by hand, observe whether the bearing is stuck or noisy, and replace the bearing or repair if necessary.
5. Conduct a comprehensive inspection of input, rectifier, inverter and DC input fast melting, and replace it in time if it is found to be burned.
6. Whether the capacitor in the intermediate DC circuit is leaking, whether the shell is expanded, bubbling or deformed, whether the safety valve is broken, the capacitance capacity, leakage current, withstand voltage, etc. can be tested if conditions permit, and the capacitor that does not meet the requirements should be replaced, and the new capacitor or the capacitor that has not been used for a long time must be passivated before replacement. The service life of the filter capacitor is generally 5 years, and if the use time is more than 5 years, and the capacitor capacity, leakage current, withstand voltage and other indicators obviously deviate from the detection standard, it should be partially or completely replaced as appropriate.
7. Conduct electrical testing on the diodes and GTO of the rectifier and inverter parts with a multimeter, measure their forward and reverse resistance values, and carefully record them in the pre-formulated table to see whether the resistance between the poles is normal, whether the consistency of the device of the same model is good, and replace it if necessary.
8. Inspect the main contactors and other auxiliary contactors in the A1 and A2 inlet cabinets, carefully observe whether the dynamic and static contacts of each contactor have arcing, burrs or surface oxidation, unevenness, and find that the corresponding dynamic and static contacts should be replaced to ensure that their contacts are safe and reliable.
9. Carefully check whether the terminal row is aging and loose, whether there is a hidden fault of short circuit, whether the connection of each connecting wire is firm, whether the wire skin is damaged, and whether the plug of each circuit board is firmly plugged. Whether the connection between the incoming and outgoing main power lines is reliable, whether there is heating and oxidation at the connection, and whether the grounding is good.
10. Whether the reactor has abnormal chirping, vibration or mushy smell.
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