The cold-rolled continuous retreat line is a heat treatment process for cold-rolled sheets, which requires the speed of the roller table to not only follow the given speed, but also to output a certain load balancing to ensure the stability of tension control.
The key to the stable and high-speed operation of the retreat line is the tension control of the retreat line, which has higher requirements for the control function of the transmission equipment, and it is necessary to combine the inverter to complete the conflict/inertia compensation and softening conditioning of the motor for a certain tension control. If the tension control function is poor, it will lead to slippage, deviation and scratching of the strip, which will affect the high-speed and stable operation of the strip, reduce the production capacity of the recoiling line, and increase the production cost and consumption of the recoiling line.
In the international top 500 of a large iron and steel enterprise subordinate cold-rolled sheet branch, one of its continuous annealing production line transmission equipment are selected imported brand, because the online imported inverter overdue service caused by the decline in function, in urgent need of replacement, and the original type of product has been discontinued, the new product equipment scale, software configuration and the original product do not match, so that the replacement operation has fallen into the dilemma of large cost and long cycle.
Therefore, it is urgent to carry out localization transformation to replace imported brand inverters to meet production requirements and reduce the cost of spare parts procurement.
The company's requirements for the operation function of the inverter are as follows:
1. The inverter is required to have high control accuracy and high overload ability.
2. The inverter is required to quickly connect the original existing equipment space, communication interface and external auxiliary circuit.
3. The inverter is used to control the retreat line, which requires dynamic high response, high precision tension and speed control, and low frequency and high torque output.
4. Seamlessly match the GSD file of the host computer, and match the complex data interaction response of the original system Profibus-DP communication control status.
According to the needs of customers, INVT provides customers with Goodrive600 high-function multi-drive inverter + PROFIBUS-DP communication card + PLC programming card supporting solutions, through the DP communication card to complete the seamless integration with the host computer system, PLC programming card to complete the original imported brand inverter built-in function block logic data programming processing, this program can complete sensitive programming to meet the function block settings in the imported inverter in different use occasions.
Solution Advantages:
1. It has the function of conflict/inertia self-learning, which can accurately identify the collision curve and inertia according to the load characteristics, actively generate the collision curve and inertia identification, and simplify the on-site parameter debugging process.
INVT Goodrive600 series high-function multi-drive inverter has the function of motor conflict and inertia parameter self-learning, after 10 speed segments are set, each speed segment is conflicted and self-learning, the corresponding 10 conflict compensation values are identified, and the characteristic curve is actively generated.
2. The value of the inertia compensation coefficient can be actively adjusted.
The inertia compensation is based on the dv/dt value issued by the host computer system to determine whether it is in the state of acceleration and deceleration, so as to accurately calculate the inertia compensation value. In addition, according to the actual speed conditioner curve, the acceleration/deceleration inertia compensation coefficient value is actively adjusted.
3. Stable control of tension.
The inertia + conflict output value is given to the additional torque channel, and the stable tension of the strip steel is controlled. Ensure that the weight output of speed conditioner I is fine-tuned within 2%, and the system will not be disordered.
After on-site debugging and verification, as shown in the video, the given linear speed of the host computer is consistent with the feedback line velocity, and after the additional torque given conditioning, the weight of the speed conditioner I is shaken within 1% of the speed steady state.
INVT's Goodrive600 series high-function multi-drive inverter has been fully optimized for the main functions such as collision and inertia, and the motor is self-learning for conflict compensation, and the dv/dt value is actively matched with the compensation coefficient issued by the host computer.
This time, INVT replaced the successful use of foreign big-name series inverters on the cold-rolled line of the cold-rolled sheet branch of a large iron and steel enterprise in the world, and after on-site verification, the operation is normal and stable, and the satisfactory speed conditioner I integral is shaken by 2% under transient and steady state
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