The hoist system is now equipped with a frequency conversion speed control solution, which brings numerous advantages in performance and reliability. One of the key benefits is its wide grid voltage tolerance of ±20%, allowing it to operate smoothly even under unstable power supply conditions. This ensures consistent performance regardless of fluctuations in the electrical grid.
The system features a new dual-CPU hardware control platform, significantly enhancing control accuracy and stability. It supports constant torque boost, ensuring that load variations caused by network instability do not affect operational efficiency. Additionally, the hoist motor can start softly, providing strong starting torque while minimizing mechanical stress on the system.
With stepless speed regulation, the motor runs more smoothly, reducing current surges and mechanical shocks during acceleration and deceleration. This leads to longer equipment life and improved safety. The inverter also offers flexible integration with external control systems, enabling customized control strategies based on site requirements.
Energy-efficient braking technologies, such as energy consumption braking, feedback braking, and super-capacitor absorption, effectively manage regenerative energy during fast deceleration or emergency stops. This not only improves energy utilization but also enhances system safety. Notably, the energy-saving effect is particularly significant at low speeds, making it ideal for applications where efficiency is critical.
When selecting the inverter, the user’s hoist motor specifications (95KW/110KW/132KW) were considered. Correspondingly, the INVT vector CHV hoist inverter models 110KW/132KW/160KW were chosen to match the system requirements.
The INVT hoist inverter uses high-quality Siemens IGBT modules and advanced microprocessor-based digital control. Its software is specifically designed for hoisting applications, addressing real-world operational challenges. The inverter allows users to set various parameters, adapting to different working environments and ensuring reliable performance.
Key features include high starting torque—150% rated torque at 0.5Hz without PG control, and 180% at 0Hz with PG control—which meets the demands of heavy-load starts. Soft starting and stopping reduce power grid impact, while continuous frequency adjustment ensures smooth speed control. The RS485 communication interface supports MODBUS RTU protocol, enabling seamless integration with PLCs or industrial computers for remote monitoring and control.
The inverter also includes comprehensive protection functions, such as overcurrent, overvoltage, overload, undervoltage, phase loss, and short-circuit protection, ensuring safe operation under all conditions.
Main functions of the INVT hoist inverter include:
- **Feedback Braking**: Returns regenerative energy to the grid.
- **Energy Consumption Braking**: Can be used independently or with feedback units.
- **DC Braking**: Ensures the hoist remains stable during braking, preventing slippage.
- **Automatic Deceleration**: Adjusts speed gradually based on system input.
- **Multi-Speed Control**: Pre-set speeds allow precise control for different operating conditions.
- **Emergency Stop**: Immediately halts the system upon receiving an emergency signal.
For the electrical system upgrade, the original power frequency control system was retained alongside the new frequency conversion system, creating a redundant setup that enhances overall system reliability. During operation, switches are manually set to either power frequency or variable frequency mode, depending on the required function.
This transformation improves efficiency, reduces maintenance costs, and increases operational flexibility. For more information, visit [ChinaWJ.com.cn](http://news.chinawj.com.cn).
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