Single girder gantry crane control circuit What are the characteristics?

1, single girder   steel crane   with a reversible asymmetric circuits.

    2, the master controller file number 3-0-3,11 loops.

    3, single girder gantry crane series resistor in series with the motor rotor

    4 down "a" file is an inverted pull reverse braking files, enabling heavy loads slow decline.

    5, down "2" file as a single-phase brake file, realize light load low speed fall.

    6, down "3" file as regenerative braking file, get above synchronous speed of high-speed fall.

    7, single girder   bridge gantry crane   parking, the circuit components to ensure the brake before driving motor 0.6s power outages, prevent slip hook.

    8, using the time delay relay KT1 reversible motor run the conversion time, to prevent contactor KM1-KM3, KM3-KM2 reversible phase transition may cause a short circuit.

    9, heavy loads, in some cases need to frequently use the jog operation, for single girder   overhead gantry crane   controller to "0" - "down 2" to "0" operation.