The hoist system has been upgraded with a frequency conversion speed regulation solution, offering enhanced performance and reliability. One of the key advantages is the wide grid voltage tolerance of ±20%, which allows the system to operate smoothly even under unstable power conditions. This ensures consistent operation in various environments.
The system utilizes a new dual-CPU hardware control platform, significantly improving control performance. It supports constant torque boost, ensuring stable operation without being affected by network fluctuations. This makes it ideal for heavy-duty applications where load variations are common.
Additionally, the hoist benefits from strong load capacity and high starting torque, enabling smooth motor startup. The frequency conversion system also allows for seamless speed adjustment, minimizing current spikes and reducing mechanical stress during acceleration and deceleration.
Integration with external control equipment is straightforward, enabling flexible and customized control modes on-site. Energy-efficient braking solutions, such as energy-consuming braking, feedback braking, or super-capacitor absorption technology, effectively manage regenerative energy during fast deceleration or emergency stops, enhancing safety and system stability.
Energy savings are particularly significant at low speeds, making this solution both cost-effective and environmentally friendly.
For the user’s hoist motor, which has a rating of 95KW/110KW/132KW, the INVT vector CHV hoist inverter model with 110KW/132KW/160KW capacity was selected. This inverter uses Siemens IGBTs as the main power components and features full digital control via a microprocessor. Its software is specifically designed for hoisting applications, taking into account real-world operational demands and ensuring safe and stable system performance under different working conditions.
Key features of the INVT hoist inverter include:
1. High starting torque: 150% rated torque at 0.5Hz without PG vector control, and 180% at 0Hz with PG vector control, meeting heavy load start-up requirements.
2. Soft start and stop capabilities reduce current impact and stabilize the power grid.
3. Continuous frequency adjustment with segmented preset settings ensures smooth and reliable speed control.
4. An RS485 communication interface supports MODBUS RTU protocol, enabling easy integration with PLCs or industrial computers for remote control and networking.
5. Comprehensive protection functions, including overcurrent, overvoltage, overload, undervoltage, phase loss, and short circuit detection, enhance system safety.
Main functions of the inverter include:
- Feedback braking: Returns regenerative energy to the grid through an energy feedback unit.
- Energy consumption braking: Can be used independently or combined with feedback braking.
- DC braking: When the master controller sends a "forward" or "reverse" command, and no "loose gate" signal is received, the inverter applies DC braking to prevent slipping during braking.
- Automatic deceleration: Adjusts speed according to set parameters when a deceleration signal is received.
- Multi-speed control: Pre-set speeds allow for flexible speed adjustments based on operational needs.
- Emergency stop: Immediate shutdown upon receiving an emergency signal, followed by mechanical braking for safety.
Electrical system transformation involves replacing the original power frequency speed control system with a frequency conversion system while retaining the original setup. This dual-system approach ensures redundancy and enhances overall system reliability.
This upgrade not only improves performance but also extends the lifespan of the hoist system, making it more efficient and safer for long-term use.
[Image: The hoist adopts the frequency conversion speed regulation technical solution]
[Source: http://news.chinawj.com.cn]
Polishing Buff Wheel
Bias Airway Buffing Wheel, also called as airway buffs, airflow buffs, Ventilated buffs. The special air folded structure brings bias airway buffing polishing wheel strong cutting force, high brightness, fine finishing, can cool the workpiece surface at a very short time. Make airway buffing polishing wheel widely use on metal and non metal products polishing, such as wood, stainless steel, aluminum, copper etc. Involved in variety of industries: furniture, automobile spare part, hardware, building materials,etc.
Airway buffs are a type of buffing and polishing wheel that is made up of multiple plys of cotton Cloth attached to a steel center plate. Each cloth layer of these 16-ply wheels is attached to the steel plate in a way that forces the cotton to form pleats.
High-speed buffing and polishing wheels can create a lot of heat from the constant friction of the wheel, surface being buffed, and Polishing Compound grinding at the same time. The fold are designed to increase airflow so that you can buff and polish at a lower temperature. This allows you to work continuously longer than traditional polishing wheels, extends the overall serving life of the airway buff, and lowers the chance of causing damage or burn to the object you are polishing.
The different colors of airway buffs are not there to let you work with your favorite color. Each of these colors has a different firmness/softness of the cloth pieces which are meant for different steps in the polishing process. You should also consider pairing each color buffing wheel with the appropriate color buffing compounds.
Cotton Polishing Buff Wheel,Sisal Buffing Wheel,Flap Buffing Wheel ,Non-woven Wheel Polishing
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