可能原因：
- 电网电压没有或者过低
- 变频器驱动板上的开关电源故障
- 整流桥损坏
- 变频器缓冲电阻损坏
- 控制板、键盘故障
- 控制板与驱动板、键盘之间连线段
解决方法：
- 检查输入电源
- 检查母线电压
- 重新拔插8芯和34芯排线
- 4~6、寻求厂家服务
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