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起重机总电源的失压保护,系指供电电源中断后能够自动断开总电源回路;恢复供电时,不经手动操作总电源回路不能自行接通。如果总电源无失压保护,供电电源中断后又恢复供电时,不经手动操作总电源能够自行接通,如操作人员误认为总电源仍然无电,有意或无意碰触控制器,将可能导致误动作,发生意外事故;或者因凸轮、主令控制器的零位保护功能失效、运行接触器触头粘连等情况,当供电
Crane total power loss of pressure protection, refers to the power supply can be interrupted automatically disconnect the main power supply circuit; restore power supply, without manual operation of the total power supply circuit can not be connected. If the total power supply without loss of pressure protection, power supply is interrupted and then resume power supply, without manual operation of the total power supply can be connected, such as the operator mistakenly believe that the total power is still no electricity, intentional or accidental touch controller may result in Misoperation, accidents; or due to cam, master controller zero protection function failure, the operation contactor contact adhesion, etc., when the power supply