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reversible controlling point of the three-phase motor short

2016-09-02 22:55  
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reversible controlling point of the three-phase motor short brake circuit
The circuit is shown. When STR is pressed, the reverse contactor KMR pulls to disconnect the braking short contacts (KMR’s normally closed contacts), thus driving the motor to run reversely. When STR is released, the contactor releases with the loss of power. And the main contact KMR is off. At this time, braking short contacts restore the closed state to drive the stator coil to produces the M braking torque for braking. Similarly, forward braking operation is done with the same methods and principles as described above. This brake circuit is only applies for small motors below 3kW.