The rewinding slitter machine is a paper processing equipment that cuts and rerolls wide web paper into different widths and diameters. A machinery factory in Zhejiang Province mainly produces corrugated paper and box board paper. In daily production, the rewinding slitter machine has two problems, including complicated tool changing operation and long tool changing time; The cutting tool equipment is in poor condition and the cutting effect is unstable.

In order to further improve production reliability and product quality, Inwitten plans to upgrade the system solution of the winder, optimize its production capacity and improve the slitting effect, in order to minimize the non-production time of the winder and reduce manual operation.

PXIE-4305 01Inwitten system transformation program

Inwitten has come up with a cost-effective technical solution that meets all the requirements for increased capacity stability. Tailor-made solutions seamlessly fit into existing production environments:

The driving layer of the system scheme mainly selects three GD350 series frequency converters, all of which use closed-loop vector, traction speed mode and winding AB torque mode. The winding tension is controlled by the proportional valve by the PLC analog output.

The start and stop of 3 frequency converters are all controlled by PLC output, 485 communication reads the current status of 3 frequency converters and controls the torque of winding AB, the analog output of traction (current speed) is given to the analog input of winding AB (torque mode speed limit), and the whole system adopts a common DC bus mode, and the electricity emitted from the machine can be returned to the host. Reduce the waste of energy through energy-consuming brake resistors, which are configured on the traction to allow for shutdowns and emergency stops.

Process requirement

Control block diagram

GD350 series inverter

Set synchronous, asynchronous motor drive, open loop, closed loop control in one, full drive

The use of new vector control algorithms, improve the robustness of motor parameters, without complex debugging parameters, and improve the high-speed stability of motor control

PXIE-4305 Strong scalability, can be selected at the same time up to 3 different types of expansion cards

Standard LCD keyboard, ease of use greatly improved, and support 3 sets of inverter parameters upload and download

Models below 110kW can achieve built-in brake units, 18.5-110kW models built-in DC reactors

Safety torque stop (STO) function is standard

02 Significant advantages after transformation

High precision and efficiency

The speed of the host and slave machine is synchronized through the analog speed limit, ensuring the dynamic response of acceleration and deceleration, communication control of winding torque, avoiding the analog control of zero float problem and eliminating the tension sensor, which can complete the cutting task more accurately, improve the product yield, and shorten the production cycle to meet the rapid needs of the market.

Energy saving and environmental protection

The GD350 uses a common DC bus method to reduce the waste of energy through the energy consumption brake resistor, reducing energy consumption and cost.

Customized service

Inwitten can follow the diversification of market demand, according to the specific needs of manufacturers, to provide customized equipment and solutions to meet the special needs of users.

The integrated features and ease of use of the Inwitten GD350 provide users with an excellent user experience, providing functional optimization of the production line for the modernization of the winder, and ultimately achieving increased production efficiency.

Printing industry equipment is gradually realizing full digital control. Inwitten’s high-performance products and automated control system solutions can achieve accurate monitoring and regulation of the entire production process, improve the stability and efficiency of equipment operation, and help existing production lines to achieve faster operation.