The Application Of WINNER-branded Vector Control Inverter In The Stirring Mill


The Application of WINNER-branded Vector Control Inverter in the Stirring Mill

Prolegomena:

The stirring machine is widely used in the fields of chemical, pharmacy, food, cement, plastic and so on. However, massive energy is being wasted by the stirring mill as it is always designed with larger capacity but commonly needn’t run at the rated speed. In addition, traditional mechanical speed control mode increases wear and tear risk, and also affects operating condition of the stirring mill.

Key Words:

WINNER-branded vector control inverter, stirring mill, energy saving

I Stirring mill

According to the characteristics of the stirring mill, it is recommended to install a vector control inverter to realize reasonable and efficient speed control, and add the bypass function, so as to realize switch between the inverter and the mains supply. In addition, the vector control inverter has multi-step speed function, which can be selected and set according to the material characteristics and chemical reaction time. WINNER-branded inverter also can help realize on line control through its powerful communication function with the industrial control computer and software.

II Application

Nearly 100 sets of upper 400kW high performance vector control inverters manufactured by Shenzhen Winner have been put into use in various industries, including the cement industry, the petrochemical industry, the ceramic industry, heating & ventilation, water supply, etc.

Features of WIN-VA inverter:

1. Applicable to large inertia load and potential load, with high accuracy. The WIN-VA series inverter can be better suitable to tough localities as its main circuit adopts the positive and negative bus superposition technology, as well as SCR noncontact technology.

2. Four control modes for option: V/F control, V/F control with P/G, vector control, and vector control with PG, which enable the inverter with high starting torque.

3. In the mode of open-loop, can realize rated torque output at low speed, speed control range hits 100:1

4. In the mode of closed-loop, can realize full torque output at zero speed, with speed control range up to 1000:1

5. Advanced motor parameter autotuning function

6. Built-in automatic torque compensation function realizes high starting torque.

7. Built-in slip compensation function realizes high efficiency.

8. Built-in RS-485 communication port, supporting MODBUS communication protocol.

9. Built-in PID regulator

10. Friendly user interface, large screen LCD. Can realize parameter online monitoring and online regulation, in addition to parameter copy function, making operation more convenient.

11. Torque control function enables the motor be able to run with a constant torque

12. Less pollution to the grid

Reconstruction Proposal:

On the operation desk, the user can enable RUN/STOP, and speed control functions, and monitoring is also accessible through sending the frequency and current signals back to the operation desk in the control room.

Parameter settings as follows:

Environment settings:

  • A1-01:4- senior setting- parameter read and written
  • A1-02:2- vector control without PG – control mode selection

Application settings:

  • B1-01:1-external terminal control-frequency command selection
  • B1-02:1- external terminal control –run command selection
  • B1-03:1- coast to stop – stop mode selection
  • B3-01:1- speed search at start – speed search selection
  • C1-01:180S- acceleration time 1- acceleration time
  • C1-02:190S- deceleration time 1- deceleration time
  • C8-30:2- carrier frequency – carrier frequency selection

IV Conclusion

After reconstruction, the system can meet all the requirements of the previous soft start system. What is more important, the user can maintain the operating frequency of the inverter at 40HZ, which is enough for its normal production. The current at the input side is around 630A, representing an energy saving rate up to 32%, compared with the previous 910A. Since the installation of the inverter last Oct., it has been working smoothly. In addition, it helps the user secure a mass of maintenance and repair cost as it can effectively prolong the useful life of the blowers.