V&T, working with Zhongchuang Minghui, has successfully installed its new grab crane control system at Dongdaqiao Station and Future Science City Station. Customers report good results.

Solving Old Problems:

The older way to run these cranes used cam controllers, contactors, and resistors. This method caused several issues: machines broke down often, wiring was complicated, they wasted power, and operators couldn't adjust speeds very well.

How V&T's Frequency Converters Help:

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2. Smarter Grab Control:

   • The operator sends a signal. The control system (PLC) then checks the motors' current, torque, and speed.

   • V&T frequency converters adjust the motors' speed and power smoothly. This keeps the grab bucket moving efficiently and stops material from spilling.

   • Even if mistakes happen:

   • If the grab opens too soon while lifting, the operator doesn't panic. Using low speeds 1 or 2 for about ten seconds lets the grab close itself. This makes the job easier and needs less skill.

3. Better Visibility for High Work:

   • When the crane works high up, operators struggle to see the grab bucket clearly. This slows things down. V&T's system shows everything important on a touchscreen. Operators work faster and don't need years of experience.

4. Smooth Speed Changes & Savings:

   • The grab open/close motor uses 3 speed settings. Other motors (trolley, bridge, auxiliary hoist) use 4 settings. V&T frequency converters make all speed changes very smooth.

   • Starting is gentle, low speeds are steady, and less electricity is wasted as heat. This is easier on the motors, especially with lots of stopping and starting, helping them last longer.

   • A shared power setup (DC bus) for the main and travel drives uses fewer cabinets, lowering the customer's costs.

5. Easy Monitoring & Fixes:

   • All V&T frequency converters connect to the PLC using communication cables. The PLC connects to the touchscreen.

   • Operators see the system status and data on the screen. They can also change some settings there easily.

   • If something goes wrong, the screen shows exactly where the problem is, including specific error messages from the frequency converters. This helps technicians fix things fast.

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The Result:

V&T frequency converters provide smooth starting, precise speed control, and strong protection. Combined with the PLC, they create a safer, more accurate, and efficient way to run grab cranes. The clear touchscreen display is key. The success at Dongdaqiao and Future Science City shows V&T's system improves crane automation, efficiency, and ease of use.