Como fazer a bom trabalho em a manutenção de poder frequência conversores
1. Based on the actual environment, determine the length of the cycle interval for comprehensive inspection and maintenance of the frequency converter. If necessary, disassemble, inspect, measure, remove dust, and tighten the rectifier module, inverter module, and circuit board inside the control cabinet. Due to the frequent blockage of the lower air inlet and upper air outlet of the frequency converter due to dust accumulation or excessive dust accumulation, the heat dissipation capacity is high and ventilation is required. Portanto, after running for a certain period of time, There is dust accumulation on the circuit board (due to static electricity), que precisa para ser limpo e inspecionado.
2. After repairing the circuit board, busbar, etc., necessário anticorrosão tratamento deve ser transportado out, isolamento pintura deve ser aplicado, e o barramento que sofreu parcial descarga ou arcing deve ser rebarbado e isolado. For isolamento colunas que foram foram isolados e quebrados 2c carbonização devem ser removido ou substituídos.
3. Check and tighten all fiação terminais para prevenir grave aquecimento causado por frouxidão.
4. Conduta a abrangente inspeção e parâmetro medição de entrada (incluindo saída) terminais, retificador módulos, inversor módulos, DC capacitores, e rápido fusão dispositivos. Se qualquer dispositivos são encontrados para ser queimados ou ter significativo parâmetro alterações, eles devem ser substituídos em um tempo maneira.
5. Regularmente e cuidadosamente verifique a rotação status de o ventilador dentro a frequência conversor. Após o poder é cut off, girar o ventilador lâminas por mão, observar se os rolamentos estão presos ou não rotando flexivelmente, e substituir eles se necessário.
6. Cuidadosamente inspecione o eletrônico componentes em o controle circuit placa, check and handle anormal fenômenos such as solda descolamento, descoloração, bulging, cracking, e fio quebra (impresso placa circuito). Se necessário, componentes com externo anormalidades pode ser medido e substituído de o circuito placa.
In practice, the decrease in capacitor capacity is directly related to the operating environment, load size, working system, and other conditions of the frequency converter. Severe environments, larger loads, frequent shutdowns, and other operating conditions can accelerate the aging of the DC main capacitor. In addition, during regular maintenance, it is necessary to carefully inspect the main DC circuit capacitor for any leakage, expansion, blistering or deformation of the shell, and whether the safety valve is opened. The capacitor capacity, leakage current (high leakage current can cause overheating of the capacitor, causing the safety valve to open, or even the capacitor to explode), and voltage resistance should be tested. Capacitors with a capacity reduction of more than 30 percent , leakage current exceeding 70mA, and voltage resistance below 650V should be replaced in a timely manner. For new capacitors or capacitors that have not been used for a long time, performance testing should be conducted to meet the usage requirements before they can be replaced.
8. For devices with high current carrying capacity such as rectifier blocks and inverter GTRs (or IGBTs), instruments and tools such as multimeter and bridge should be used for testing and voltage withstand tests. The forward and reverse resistance values should be measured and recorded in a table. Modules with significant parameter differences should be replaced.
9. Check the main contactor and other auxiliary relays, cuidadosamente observe se the dynamic and static contacts of each contactor have arcing, burrs, or surface oxidation, unevenness, etc. If such problems are found, the corresponding dynamic and static contacts should be replaced to ensure safe and reliable contact.
10. Regularly check the voltage fluctuation of the frequency converter power supply. We need to improve the phenomenon of frequency converters in special usage environments and large load fluctuations to avoid the impact of high currents on the frequency converter, which may affect its normal operation.
Frequência conversores são amplamente usados em indústrias tal como metalurgia, petroquímica, energia, máquinas, e civil aparelhos devido a sua ampla velocidade alcance, rápido dinâmico resposta, alta velocidade regulação precisão, completa proteção funções, e simples operação. In general, after using the frequency converter for about 7 years, it will enter a period of frequent faults, which may lead to component burnout, failure, frequent action of protection functions, and other faults, seriously affecting its normal operation.
