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The cantilever crane control system utilizes frequency converters and programmable control technology, offering features such as high control precision, stable operation, excellent braking performance, and high energy efficiency. It is suitable for various single-girder and double-girder bridge cranes, as well as for the control cabinets of all electric drive systems and their technical upgrades. It can achieve smooth operation of gantry cranes and bridge cranes, improve operational efficiency, address the issue of overloading, eliminate starting shocks, reduce electrical maintenance needs, lower power consumption, improve the power factor, and extend their service life – all with positive results. At the same time, this system also features protection against overcurrent, overvoltage, undervoltage, and missing input phases, as well as protection against overheating, overload, overspeed of the inverter, overheating of the regenerative braking unit, fault conditions, and motor failures. It has the following notable features: a wide speed control range, allowing for multiple speed options ； The functions of soft start and soft stop reduce mechanical transmission shocks, which can significantly improve the load-bearing capacity of steel structures and extend the service life of cranes ； Highly integrated components and highly reliable low-voltage electrical devices effectively address the issue of complex wiring in existing electrical systems; they not only reduce the system’s failure rate but also make maintenance easier ； The motor is capable of delivering full torque at zero speed, and it uses direct-current braking as well as regenerative braking; even if the brakes loosen or fail, the load will not slide down, ensuring the reliability of the safety system ； It features a rapid dynamic response, avoids hook slipping, and truly achieves the “zero-speed crossing” function. A dedicated load weight measuring and controlling device, along with corresponding software, allows the lifting speed to change automatically based on the load weight, thereby meeting the requirement of faster operation at light loads and slower operation at heavy loads ； The frequency converters used in the system feature an automatic energy-saving operation mode, which enables a significant improvement in the system’s power factor and overall efficiency. The regenerated electrical energy is automatically fed back into the power grid, resulting in substantial energy savings; the average power reduction rate can exceed 20% ； It features a fully Chinese-language panel monitoring system that enables self-diagnosis and troubleshooting of system faults through the panel, facilitating maintenance and on-site monitoring by technicians and operators, while significantly reducing repair time and costs ； By adopting a variable-frequency speed control system, improper operations by operators can be completely eliminated ； It features multiple interfaces, enabling easy remote and network-based control and monitoring. The variable frequency speed control technology for cantilever cranes features a large starting torque at low speeds of the lifting mechanism, stable operating current, normal motor temperature, smooth operation of the lifting and trolley mechanisms without any shocks, as well as a comprehensive system fault diagnosis function ； The lifting and running brakes engage only at low speeds, thereby **extending the service life of the brakes** ； The system features hook safety monitoring, which ensures safety during lowering and facilitates accurate alignment of the cargo ； The system continuously monitors and alerts regarding the status of the machine’s mechanical brakes, ensuring safety and reliability ； Thanks to the use of load measuring and control devices along with related software, cranes equipped with two lifting mechanisms (primary and secondary) can have these combined into a single mechanism, which meets the operational requirements and thus reduces the overall manufacturing cost.