Lifter brake control circuit

The braking circuit of the cargo crane is as shown in the figure.
    The overload and short-circuit protection of the circuit uses thermal relays
  , temperature relays (Kt) and fuses; the short-circuit protection of motor
  MJ uses automatic switch QF (with short-circuit   trip coil); the relay itself has a voltage loss protection   function , using the damper switch SF Realize   the protection of air supply stop.     Protection against free fall of goods: When one of the contactors   KM4, KM5, KM6 is disconnected, the time   relay KTs loses power, and its delayed closing normally open contact   opens after a certain delay (about 0.5s), and the system When the dynamic contactor   KMr loses power, it is released, and its normally open contact is disconnected. When the electromagnetic   brake YA loses power, it brakes the motor to prevent the goods   from falling . The function of KTs is that the motor speed   cannot drop immediately after a sudden power outage, and it is not appropriate to brake it   immediately .