Bridge crane electrical control system based on PLC (Programmable Logic Controller) and variable frequency motor

The invention discloses a bridge crane electrical control system based on a PLC (Programmable Logic Controller) and a variable frequency motor. The bridge crane electrical control system is driven by the variable frequency motor, the system planning and layout are reasonable, and related safety protective measures are achieved. An automatic operation mode and a manual operation mode exist, and switching is carried out through corresponding buttons of a remote controller. When the system is in the automatic mode, a DSP (Digital Signal Processor) gives a speed instruction and a direction instruction; and when the system is in the manual mode, the remote controller gives a control instruction through the PLC. In the automatic mode, related algorithms can be designed according to the real-time state of a crane and the operation requirements, and the variable frequency motor is controlled to do the corresponding action. The bridge crane electrical control system achieves the purpose of automatic control over the type of 32t bridge cranes, and the method has the beneficial effects that the structure is simple, the design is reasonable, and the rotating speed of the motor can be controlled in real time.