High-voltage inverter maintenance

In order to allow the inverter to work better and extend its service life, daily maintenance is especially important. Then, in order to prevent unnecessary downtime accidents, this article provides a detailed description of high-voltage inverter maintenance and precautions for everyone to learn.

The items that need to be maintained after the inverter stops:

1. Check that the connection between the cables inside the inverter should be correct and reliable.

2. Check the ventilation and lighting equipment of the inverter room to ensure that the ventilation equipment can operate normally.

3. Fasten each connecting nut of the internal cable of the inverter once every six months (internal).

4. Check that all the grounding in the inverter cabinet is reliable and there is no rust on the grounding point.

5. Thoroughly clean the inside and outside of the inverter cabinet with a vacuum cleaner with a plastic nozzle to ensure that there is no excessive dust around the device.

6. After the inverter resumes operation after a long shutdown, the insulation of the inverter (including the phase-shifting transformer and the main circuit of the bypass cabinet) shall be measured, and a 2500V megohmmeter shall be used. Only after passing the test insulation can the frequency converter be started.

7. Check the tightness of all electrical connections, check whether there are abnormal discharge traces in each circuit, whether there is strange smell, discoloration, cracks, breakage and so on.

8. After each maintenance of the inverter, it is necessary to carefully check for missing screws and wires to prevent short circuit accidents caused by small metal objects. In particular, after major changes to the electrical circuit, ensure that the connection of the electrical connection is correct and reliable and prevent the occurrence of a 'reverse transmission' accident.

Daily maintenance precautions:

1. Carefully monitor and record each display parameter on the inverter's man-machine interface, and find that the abnormality should be immediately reflected.

2. Carefully monitor and record the ambient temperature of the inverter room. The ambient temperature should be between -5°C and 40°C. The temperature rise of the phase-shifting transformer must not exceed 130°C.

3. In summer, it is a rainy season. Prevent rainwater from entering the inverter (for example, the rain enters the outlet of the wind tunnel).

4, the frequency conversion room must be kept clean and tidy, should be cleaned at any time according to the actual situation at the scene.

5, ventilation and lighting of the frequency conversion room must be good, ventilation and heat dissipation equipment (air conditioning, ventilation fans, etc.) can operate normally.

6. In the normal operation of the inverter, a standard thickness A4 paper should be able to be firmly adsorbed on the inlet air inlet of the door.

7. The filter on the frequency converter cabinet door should normally be cleaned once a week; if the working environment has more dust, the cleaning interval should also be shortened according to the actual situation.

8. When the summer temperature is high, the ventilation and heat dissipation at the installation site of the inverter shall be strengthened. Make sure that the surrounding air does not contain excessive amounts of dust, acids, salts, corrosive and explosive gases.