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发明公开
CN103166195A 变频器失速保护系统及方法 有权 转让

变频器失速保护系统及方法
摘要：
本发明提供了一种变频器失速保护系统，包括第一采样单元、过载判断单元以及故障处理单元；其中所述故障处理单元，用于进行故障处理，所述故障处理包括向制动器输出关闭指令并使变频器停止输出；所述第一采样单元，用于采样所述变频器的输出端的输出转矩；所述过载判断单元，用于根据所述第一采样单元采样的输出转矩判断变频器是否过载，并在确认过载时使故障处理单元进行故障处理。本发明还提供一种对应的变频器失速保护方法。本发明通过检测变频器输出端口的输出转矩，判断变频器是否过载，并在判断变频器过载时进行故障处理，从而避免了变频器因过载而导致的危险。
摘要（英）：

The invention provides a system for frequency changer speed reduction protection. The system comprises a first sampling unit, an overload judge unit and a fault processing unit. The fault processing unit is used for fault processing which comprises that a close command is output to a brake and a frequency changer stops output. The first sampling unit is used for sampling output torque of an output end of the frequency changer. The overload judge unit is used for judging whether the frequency changer is overloaded according to the output torque sampled by the first sampling unit, and if the frequency changer is overloaded, the fault processing unit is used for fault processing. The invention further provides a corresponding method for frequency changer speed reduction protection. The output torque of the output end of the frequency changer is detected so that whether the frequency changer is overloaded is judged, fault processing is carried out when the frequency changer is overloaded by judging, and accordingly danger caused by overloading of the frequency changer is avoided.

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