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Advantages of vvvf ( variable voltage variable frequency drive ) drives over non vvvf drives for EOT cranes?

 1. Smooth starts and stops. 

2. No jerking of the load. 

3. Exact positioning 

4. Better protection for the motor. 

5. high/low-speed selection. 

6. Reliability of brake shoe. 

7. Programmable brake control. 

8. Easy circuitry 

9. Reduction in controls 

10. Increases motor life

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