Rolling mill

Nancal provides a complete set of variable frequency drive solution for single stand and multi-stand stainless steel reversible rolling mill. The motor drive device adopt Nancal NC EVFD series Industry AC VFD which has multi-drives with common DC bus, the rated voltage can choose 380V,480V or 690V.
 
  • Abstract
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  • Applications

Nancal provides a complete set of variable frequency drive solution for single stand and multi-stand stainless steel reversible rolling mill. The motor drive device adopt Nancal NC EVFD series industry AC VFD which has multi-drives with common DC bus, the rated voltage can choose 380V,480V or 690V. The rectification part can be equipped with high-performance IGBT PWM rectification ISU1 module or economical IGBT 6-pulse rectification ISU2 module. These two kinds of modules all can support four-quadrant operation and up to 16 same specification modules operated in parallel to meet the driving requirements of large-capacity rolling mill.

Main rolling machine, reeling/unreeling machine and small winding/unwinding machine are hung on the public DC bus, making full use of the feedback energy of reeling/unreeling machine. Therefore, reducing the overall capacity of the rectifier unit and expense. The choice of common DC bus can also remove chopper brake and brake resistor to save space.

 
 
Application of NC EVFD series low voltage industry drive in Main Rolling Mill of a Stainless Steel Plant in Ningbo
Shanghai Nancal Electric Co.,Ltd provides overall solution and project implementation of low voltage electric drive and automatic control system for 500-combination-forming single-stand reversible cold rolling mill.
The project includes 8 machines, including 2 sets 400 kW main rolling machine, 2 sets 200 kW main winding/unwinding machine, 2 sets 55 kW small winding/unwinding machine and 2 sets 15 kW pressuring motor, and all motors are driven by NC EVFD series industry drive. The input voltage of VFD is 690V.The rated frequency of main machine and winding/unwinding machine is 30 Hz, the maximum operating frequency is 90Hz, accuracy of tension control requires less than 1% and the maximum rolling line speed is 200 meters/min. 2 sets 15kW pressuring motor use single-drive with chopping braking module and braking resistor, the other drives use multi-drive with common DC bus and IGBT 6-pulse rectifier unit with regeneration function.

The overall control scheme of the reversible cold rolling mills is based on high-performance industrial microcomputers, programmable logic controllers (PLCs) and AC drive control systems. The latest all-digital system is used to form a fully distributed networked modern control system. An industrial fieldbus is used for data communication between the drive control system and the automation control system. The operation console is designed according to the principle of advanced, centralized and convenient.


The PLC is mainly responsible for converting the line speed and tension into the speed and torque limit acceptable by the VFD, and then transmitting it to the EVFD control system through the DP bus communication. The EVFD drive the motor according to the system setting mode, basing on the received speed reference and torque limit. The industrial microcomputers is responsible for the speed control and the load balance calculation of the upper and lower rollers.
During the production, NC EVFD series industry drive runs stably with high accuracy control of tension and speed, and the entire system control performance are comparable to import brands, which can fully meet the strict process requirements. 


NC EVFD series low voltage industry drive completely satisfy the requirements of stainless steel cold rolling mill, with a series of technical features such as modular design, multi-drives with common DC bus, high accuracy control of speed and tension, high power density and high reliability.
The whole production line of the stainless steel rolling mill project in Ningbo uses NC EVFD series drive, which realizes the successful application of all domestic AC drive in the metallurgical main rolling mill production line the first time. It is of great significance for the localization of AC drive in the field of metallurgical main rolling mill.
 
 
 
 

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