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变频器常见故障及处理方法包括：电源故障：检查电源线是否接触良好；控制器故障：检查控制器是否正常工作；传感器故障：检查传感器是否正常工作；输出模块故障：检查输出模块是否正常工作；软件故障：检查软件是否正常工作等等。

　　除此之外，变频器在使用中还有以下这些故障现象

　　（1）故障P.OFF

　　变频器上电显示P.OFF延时1~2s后显示0，表示变频器处于待机状态。在应用中若出现变频器上电后一直显示P.OFF而不跳0现象，主要原因有输入电压过低、输入电源缺相及变频器电压检测电路故障，处理时应先测量电源三相输入电压，R、S、T端子正常电压为三相380V，如果输入电压低于320V或输入电源缺相，则应排除外部电源故障。

　　（2）故障ER08

　　变频器出现ER08故障代码表示变频器处于欠压故障状态。主要原因有输入电源过低或缺相、变频器内部电压检测电路异常、变频器主电路异常。通用变频器电压输入范围在320V~460V，在实际应用中变频器满载运行时，当输入电压低于340V时可能会出现欠压保护，这时应提高电网输入电压或变频器降额使用。

　　（3）故障ER02/ER05

　　故障代码ER02/ER05表示变频器在减速中出现过流或过压故障，主要原因为减速时间过短、负载回馈能量过大未能及时被释放。

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