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Quick door inverter maintenance

Source : en.jlksm.comClicks : Loading ... Issuing Time : 2018-09-25 17:28:44

1) regularly dedust the frequency converter, focusing on the rectifier cabinet, inverter cabinet and control cabinet. If necessary, remove the rectifier module, inverter module and circuit board in the control cabinet. Whether the air inlet or upper air outlet of the frequency converter is dusty or blocked due to excessive dust accumulation. The frequency converter requires a large amount of ventilation due to its heat dissipation, so after running for a certain time, the surface area dust is very serious and must be cleaned and cleaned regularly.

(2) the inverter the front door, open the back door open, carefully check the ac and dc bus without deformation, corrosion and oxidation, bus joint screw is loose, the installation of fixed point of solid screw is loose, fixed with insulation or insulating column with and without cracking or deformation, if any should be replaced in a timely manner, to tighten, the bus has occurred deformation must be adjusted.

(3) after the dedusting of the circuit board and bus bar, necessary anti-corrosion treatment shall be carried out, and insulating paint shall be applied. After the burrs of the bus bar that has appeared partial discharge and arc pulling shall be removed, treatment shall be carried out again. The damaged part of the insulating board which has been insulated shall be removed, and the insulation board of corresponding insulation grade shall be used to insulate the board near the damaged part. After fastening and testing the insulation, the board shall be deemed qualified before being put into use.

(4) whether the operation and rotation of the fan in the rectifier cabinet and inverter cabinet are normal or not; when the machine is stopped, turn it by hand to observe whether the bearing is stuck or noisy, and replace the bearing or maintain it if necessary.

(5) carry out comprehensive inspection on input, rectifier, inverter and direct current input quick melting, and find it burnt and replaced in time.

(6) the intermediate dc circuit of capacitor with and without leakage, shell expansion, bubbling or deformation, the relief valve is broken, conditional on the capacitance, leakage current and withstand voltage test, does not meet the requirements of the capacitance for replacement, for new or long-term idle unused capacity, change the former must be on the passivation treatment. The service cycle of filter capacitors is generally 5 years. For those whose service time is more than 5 years and whose capacitance, leakage current, voltage resistance and other indicators are obviously deviated from the test standard, some or all of them should be replaced as appropriate.

(7) perform electrical detection on diodes and gtos of the rectifier and inverter parts, measure their forward and reverse resistance values, and carefully record them in the prepared form to see whether the inter-electrode resistance values are normal, whether the same type of device is consistent, and replace them if necessary.

(8) check the main contactor and other auxiliary contactor in the A1 and A2 incoming line cabinet, and carefully observe whether the dynamic and static contactor of each contactor has arcs, burrs or surface oxidation and bumps. It is found that this kind of problem should be replaced by the corresponding dynamic and static contactor to ensure its contact safety and reliability.

(9) carefully check whether the terminal row is aging and loose, whether there is a hidden fault of short circuit, whether all the connecting lines are firmly connected, whether the wire skin is damaged or not, and whether each circuit board is firmly connected with plug. Whether the connection of the main power line in and out is reliable, whether the connection has the phenomenon of heating and oxidation, and whether the grounding is good.

(10) the reactor has no abnormal sound, vibration or mushy taste.