Total mainframe power switch could not be activated: check whether the Master relay is damaged, whether the flow relay tripped.
主机总电源开关不能启动：检查主令继电器是否损坏，过流继电器是否跳闸。
It is composed of master, relay unit and module unit.
控制系统由上位机、中继单元和模块单元构成。
It is composed of master, relay unit and module unit.
控制系统由上位机、中继单元和模块单元构成。
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