The operator must be familiar with the basic working principle and functional characteristics of the Siemens inverter.
With electrician operation knowledge. Prior to the routine maintenance of the frequency converter, it must be ensured that the total power supply of the equipment is cut off; and after 3-30 minutes (according to the power of the frequency converter) of the inverter display completely disappears. Should pay attention to check the grid voltage, improve the surrounding environment of the inverter, motor and line, regularly remove the dust inside the inverter, and greatly reduce the fault rate of the inverter by strengthening the management of the device.
1, cooling fan
The power module of the inverter is a device with serious heat generation. The heat generated by continuous operation must be discharged in time. The life of a typical fan is approximately 20kh to 40kh. According to the continuous operation of the inverter converted to 3 to 5 years, fans should be replaced to avoid failure due to poor heat dissipation.
2, filter capacitor
Intermediate circuit filter capacitor: also known as electrolytic capacitor, the role of the capacitor: filter after the rectified voltage ripple, but also between the rectifier and the inverter decoupling to eliminate mutual interference, but also to provide the necessary motor Power, to withstand a great pulse current, so the service life is short, because it needs to store energy in the work, so it must be long-term power, the heat generated by its continuous work plus the heat generated by the drive itself will accelerate the electrolyte Cognac directly affects the size of its capacity. The normal life of the capacitor is 5 years. It is recommended that the capacity of the capacitor be checked once a year on a regular basis. Generally, a reduction of more than 20% of its capacity should be replaced.
3, the use of preservatives
Due to the production characteristics of some companies, the corrosive gas concentration in each electrical mcc room is too large, resulting in many electrical equipment being damaged due to corrosion (including inverters).
In order to solve the above problems, an air conditioning system can be installed to improve the environmental conditions with positive pressure fresh air. In order to reduce corrosion of corrosive gases on circuit board components, inverter manufacturers may also be required to perform anti-corrosion processing on circuit boards, and anti-corrosion agents shall also be applied after maintenance to effectively reduce the failure rate of the inverter and improve the efficiency of use. .
4. Dust removal from the frequency converter: Inverters should be regularly inspected according to the use of different environments, whether the accumulation of dust in the cooling channel, and the circuit board, usually cleaned once every six months, at least once a year to clean, to ensure that the inverter cooling To prevent malfunction due to poor heat dissipation.
Carefully check the frequency converter at the same time as maintenance, and send power regularly, with the frequency of the motor working at 2hz for about 10 minutes to ensure that the frequency converter is working properly.
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