Frequentes falhas em o auxiliar controlo circuito de o poder inversor para manutenção
Control circuits such as frequency converter drive circuits, protection signal detection and processing circuits, pulse generation and signal processing circuits are called auxiliary circuits. After the auxiliary circuit malfunctions, the cause of the malfunction is relatively complex. Exceto para a perda de o solidificação programa ou o dano do o integrado bloco (que pode apenas ser manipulado por substituir o controle placa as a todo ou o integrado bloco), outros falhas são mais fáceis para diagnosticar e manipular.
1. Reparar a unidade circuito falha de a frequência conversor
O condução circuito é usado para dirigir o IGTR de o inversor, e ele é também prono para falhas. Geralmente, lá há óbvio sinais de dano, tal como dispositivo (capacitor, resistor, transistor, impresso placa, etc.) bursting, descoloração, fio quebra, e outro anormal fenômenos, mas lá vai não ser qualquer completo dano dano para o condução circuito. o processamento método é geralmente baseado em o esquemático diagrama, e cada grupo de condução circuitos é verificado, medido, substituído, comparado, e outros métodos passo por passo em reverso;
Or compare e inspecione com outro genuíno (novo) driver placa, e gradualmente localizar o falha ponto. Solução de problemas passos: Primeiro, limpar e remover poeira e sujeira de o inteiro circuit placa. If a quebrado impresso circuit is found, repair the wire; Replace damaged components immediately upon detection;
Based on practical experience analysis, methods such as measurement, comparison, and substitution are used to determine suspected components. Some components require offline testing. After repairing the driving circuit, an oscilloscope should also be used to observe the output waveforms of each group of driving circuit signals. If the three-phase pulse size and phase are not equal, there are still abnormal areas in the driving circuit (mismatched parameters of replaced components can also cause such phenomena), and repeated inspection and processing should be carried out.
The damage to the driving circuit of high-power transistors is is also one of the reasons for the overcurrent protection function to operate. The common phenomena of damaged driving circuits are phase loss, unequal three-phase output voltage, and unbalanced three-phase current.
2. Reparar o dano para a frequência conversor switch alimentação alimentação
One obvious feature of damaged switching power supply is that there is no display after the inverter is powered on. For example, the Fuji G5S frequency converter adopts a two-stage switching power supply, which is based on the principle that the DC voltage of the main DC circuit is reduced from over 500V to about 300V, and then through a one-stage switch voltage reduction, the power supply outputs multiple power sources tal como 5V e 24V.
Comum danos para switching power supplies include breakdown of switch tubes, burning of pulse transformers, damage to secondary output rectifier diodes, prolonged use of filter capacitors, resulting in changes in capacitor characteristics (reduced capacity or high leakage current), decreased voltage stability, and easy damage to switching power supplies.
In addition, one of the common fault phenomena is that the frequency converter does not display after being powered on, and most of the reasons for such faults are also caused by damage to the switching power supply. The switching power supply of the MF series frequency converter adopts a common flyback switching power supply control method. A curto circuito em a saída estágio circuito de o comutação alimentação pode também causa dano para o comutador alimentação alimentação, resultando em no exibição de a frequência conversor.
