Solution of fu9000d series inverter in refiner

      1. Introduction:

      The paper industry is an important basic raw material industry closely related to the development of national economy and social undertakings, and is an important pillar industry of China's national economy. At present, more than 80% of the new paper machine's drive equipment has adopted AC drive inverter.

      Refiner is a key part of pulp production, and its pulp production line is composed of a series of supporting equipment. In order to improve production efficiency and ensure the quality of pulp, all transmission parts need a high degree of coordination. At present, the important transmission of advanced production lines are driven by frequency converter. Fu9000d series of Manyi Electric is widely used in paper industry.

      2. Features of fu9000d series frequency converter of Manyi Electric Co., Ltd

      The power range of fu9000d series is 0.75kw-630kw, the incoming voltage is 380v-480v, and the control mode is vector control without speed sensor.

      3. Advantages of the scheme:

      (1) Large starting torque, 1.5 times of torque output at 0.5Hz, meeting the operation requirements of the refiner;

      (2) It has the advantages of fast torque response and small current fluctuation when the load fluctuates;

      (3) It has good overload capacity and environmental adaptability, and high operation reliability;

      (4) Super grid adaptability, anti grid fluctuation ability of ± 15%, ensuring the stability of output voltage, current and speed;

      (5) Excellent current limiting characteristics, strong overload capacity, can effectively reduce the frequency conversion overload, over-current protection, maximum guarantee the continuity of production;

      (6) It can adapt to harsh environment, dust and oil pollution;

      4. System introduction:

      In this system, the 110KW main motor of the refiner is driven by fu9000d-110kw-4 frequency converter, and all the executive components and sensors of the whole production line are connected through the central control system DCS, so as to monitor the field situation of each transmission system in real time. The central control system controls the start and stop, frequency setting, fault reset and other commands of all frequency converters, and collects the current, voltage, bus voltage, operating frequency and other data of all frequency converters to monitor each frequency converter in real time.

      7. Operation effect:

      The control system of refiner using fu9000d-110kw-4 inverter has been put into operation for more than one year, and good economic and social benefits have been achieved

      *The control device has reliable operation, good adaptability to the environment, and low failure rate;

      *Excellent current limiting characteristics, strong overload capacity, can effectively reduce the frequency conversion overload, over-current protection, maximum guarantee the continuity of production;

      *The feeding quantity is controlled by the actual running current of the motor, and the overload pre alarm function and trip free function can ensure the safety of the motor and the continuity of production;

      *The economic benefit is remarkable, the power saving effect is more than 20%, and all the investment increased by using frequency conversion control system can be recovered in more than one year;

      8. Customer revenue:

      *The speed regulation is convenient, which can ensure the most uniform mixing of coating and medium;

      *The loss of gearbox is reduced and the maintenance cost is greatly saved;

      *The comprehensive protection function of frequency converter ensures the continuity of production to the maximum extent;

      *Online stepless speed regulation, different grinding speed for different varieties;

      *The economic benefit is remarkable, and all the investment increased by using frequency conversion control system can be recovered in more than one year.