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Three-phase motor automatic limiting reversing circuit

2016-09-02 03:45  
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Three-phase motor automatic limiting reversing circuit
In the circuit shown as the chart, KT1, KT2 are the time relays. After closing the main switch QS, K1 and KMF pulls in, then the motor runs forward, and KT1 starts to time. When the time of KT1 arrives, it automatically disconnects, and K1 coil loses power, and KMF releases, then the motor stops; At the same time, the normally open contacts of KT1 are closed, and coil K2 pulls in, KMR coil gets electric to make motor run reversely, then KT2 starts to time. When the time of KT2 arrives, its normally contact KT2 is closed, and K2 coil loses power to make KMR release, then the motor stops. K2's loss of power could make its the normally closed contact restore normally closed state, then KT1, K1 work make the motor run forward.