Abstract
In order to realize multi-speed control of motor, a control system based on S7-1200 PLC and Siemens MicroMaster420 frequency converter is designed. Through the analysis of the cooling fan control requirements, the hardware system and software programming of the whole control system are designed. The PLC control unit of the control system completes signal acquisition, logic control and communication, etc. The system sets the parameters of the converter by changing the on-off state of the converter digital input, and further realizes the steering change and speed adjustment of the motor. Through experimental comparison, it is concluded that the control system designed in this paper can save more than 30% of the electric energy. The load of the motor is greater, and the energy-saving effect is more obvious. The advantages of the control system are simple circuit structure and convenient operation. The designed control system is simple and effective to realize the multi-stage control of the motor and improve the reliability and stability of the motor.
Highlights
At present, resource consumption and waste per GNP in China are much higher than those in most other countries
Variable frequency speed control technology with excellent speed control performance, significant power saving effect is widely used in all fields
Variable frequency speed regulation is an important means of saving energy, reducing consumption and improving control performance
Summary
Resource consumption and waste per GNP in China are much higher than those in most other countries. Environmental protection and energy saving has been an increasing number of the factory to improve the quality and sustainable development as an important way. Variable frequency speed control technology with excellent speed control performance, significant power saving effect is widely used in all fields. Variable frequency speed regulation is an important means of saving energy, reducing consumption and improving control performance. Variable frequency speed regulation of frequency converter plays an important role in energy saving. Based on the control system composed of PLC and frequency converter can improve the starting performance and energy-saving optimization of motor. The multi-speed control of the motor is realized, which can improve the performance of the motor and prolong the service life and save energy[4]
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