Application of the Xinshida AS700 Series Inverters in Quay-Side Container Handling Cranes in the Lifting Industry
2025-06-04
Application of the Xinshida AS700 Series Inverters in Quay-Side Container Handling Cranes in the Lifting Industry
Project Background
The quay-side container handling bridge (commonly referred to as a quay crane) is a large, elevated, mobile crane positioned along the shoreline of a terminal. It is currently the core vessel-handling equipment at specialized container terminals. The quay crane primarily consists of a lifting mechanism, a trolley structure, a hoist structure, and a luffing mechanism.
Customer needs
Due to their complex operating environment and high-precision operational requirements, quay cranes pose numerous challenges to the performance of frequency converters. The frequency converters must possess strong overload capacity, stable operation capability, high starting torque, and excellent environmental adaptability in order to meet the quay cranes’ demands for efficient and reliable operation.
Xinshida Solution
Scheme advantages
The Xinshida AS700 series frequency converters demonstrate excellent compatibility in the lifting industry.
● Wide range of applications: The product boasts powerful performance and can meet various operating conditions.
● Modular unit design: Allows system integrators and OEM customers to design enclosures according to their own specific requirements.
● Wide power and voltage ranges: 3-phase, 380V - 500V, 250kW - 1400kW; 3-phase, 525V - 690V, 315kW - 1600kW
● Full-energy regenerative transmission
● Unit Fiber Optic Communication Technology
The power unit and the control unit are separated, with strong and weak electrical signals isolated, thereby enhancing the system's anti-interference capability.
● Flexible power unit configuration: Large-capacity output is achieved through parallel connection of power units, enhancing equipment interchangeability and reducing the number of spare parts.
● Easy equipment maintenance
The power unit is equipped with wheels at the bottom and uses a trolley-mounted platform for installation, making it easy to install and disassemble. It can be configured with maintenance tools, significantly reducing maintenance time.
● Large capacity, low harmonics, high power factor
By implementing a common DC bus architecture and leveraging active rectification and energy-recovery technologies, we can improve the power factor of the product, reduce harmonic distortion, and feed the regenerated electrical energy back into the grid, thereby saving energy.
● Torque memory function
At each time the brake is closed, record the motor’s output torque at that moment. When the brake is opened next time, the motor will output the torque value previously memorized, thereby preventing the load from slipping.
● Dual sets of motor parameter and operating curve switching functions
Using a single inverter to drive motors operating under two different conditions helps reduce equipment investment. Upon receiving a switching signal, the inverter immediately switches the motor parameters and operational curve settings, ensuring smooth and reliable equipment operation.
● Master-slave control
Two motors are connected coaxially to drive the drum. The master motor operates in speed-control mode, while the slave motor operates in torque-control mode. The master motor outputs torque to the slave motor via communication or analog signals, thereby achieving master-slave control and ensuring that the two motors deliver identical output power.
● Weak magnetic function
Below the rated load, the inverter automatically calculates and provides the maximum speed at this point (above the base frequency) to enhance the equipment’s operational efficiency.
● High starting torque
V/F control: 150%, 2.5 Hz;
PG-free vector control: 200%, 0.5 Hz;
With PG vector control: 200%, 0 Hz.
● High overload capacity
150%, 1 min; 200%, 2 s
Scheme Composition
Associated products
AS700 Air-Cooled Multi-Machine Drive Inverter
Project Results
Runs smoothly.
