Electrical control systems, the historical development of electrical control systems

Electrical control technology is a control technology that uses various motors as the power transmission device and system to realize the automation of the production process.

The electrical control system is the backbone of it, which is widely used in many departments of the national economy and is an important technical means to realize the automation of industrial production.

With the continuous development of science and technology, the continuous improvement of production technology, especially the application of computer technology, the emergence of new control strategies has constantly changed the face of electrical control technology.

In terms of control methods, it has developed from manual control to automatic control; In terms of control function, it has developed from simple control to intelligent control; In terms of operation, it has developed from bulky to information-based processing; In terms of control principle, it has developed from a single hard-wired relay logic control system with contacts to a networked automatic control system centered on microprocessor or microcomputer.

Modern electrical control technology comprehensively applies advanced scientific and technological achievements such as computer technology, microelectronics technology, testing technology, automatic control technology, intelligent technology, communication technology, and network technology.

The relay-contactor control system is still the basic form of electrical control widely used in many production machinery and equipment, and it is also the basis for learning more advanced electrical control systems.

It is mainly composed of relays, contactors, buttons, travel switches, etc., and is called an intermittent control system because its control mode is intermittent.

It has the advantages of simple control, convenient and practical, low cost, easy maintenance, and strong anti-interference ability.

However, due to its fixed wiring mode and poor flexibility, it is difficult to adapt to the needs of complex and variable control objects, and the working frequency is low, the contact is easily damaged, and the reliability is poor.

The programmable controller PLC with microprocessor as the core to realize various control functions by software means is a new type of industrial control device born and developed in the 60s of the 20th century.

It has a series of advantages such as strong versatility, high reliability, can adapt to the harsh industrial environment, simple command system, simple programming, easy to learn, easy to master, small size, less maintenance work, convenient on-site connection and installation, and is gradually replacing the traditional relay control system, which is widely used in metallurgy, mining, building materials, machinery manufacturing, petroleum, chemical industry, automobile, electric power, papermaking, textile, loading and unloading, environmental protection and other industries.

In the field of automation, programmable controllers, CAD cam and industrial robots are known as the three pillars of automation in the processing industry, and their applications are becoming more and more extensive.

The programmable controller technology is based on the hard-wired relay-contactor control, and gradually develops into a control device with functions such as logic control, timing, counting, calculation, data processing, analog adjustment, and network communication.

It can meet the needs of various types of mechanical control through digital or analog input and output.

Programmable controllers and related external devices are designed according to the principle that they are easy to integrate with the industrial control system as a whole, and to easily expand their functions.

Programmable controllers have become the main electrical control devices for switching control in production machinery and equipment.

Electrical control system refers to the combination of a number of electrical components, used to achieve the control of a certain or certain objects, so as to ensure the safe and reliable operation of the controlled equipment, its main functions are: automatic control, protection, monitoring and measurement of the skin.

The electrical control system is generally called the secondary control loop of electrical equipment, different equipment has different control loops, and the control methods of high-voltage electrical equipment and low-voltage electrical equipment are also different.

The device should have the following functions:

1) Automatic control function.

The volume of high-voltage and high-current switchgear is very large, and the operating system is generally used to control the opening and closing, especially when the equipment fails, the switch needs to be automatically cut off the circuit, and there must be a set of automatically controlled electrical operation equipment to automatically control the power supply equipment.

2) Protection function.

Electrical equipment and lines will fail during operation, and the current (or voltage) will exceed the range and limit of the allowable operation of equipment and lines, which requires a set of protection equipment to detect these fault signals and automatically adjust (disconnect, switch, etc.) the equipment and lines. Dan ant slippery.

Summary. Electrical control refers to the use of electrical equipment and electronics to control the operation and working status of mechanical devices or industrial machines. Electrical control plays an extremely important role in modern industry, such as automated production lines, industrial robots, generator control, etc., all need electrical control equipment to achieve.

Common electrical control devices include control circuits, control power supplies, controllers, contactors, relays, PLCs (programmable logic controllers), etc. Through these devices, machines or devices can be controlled, monitored, protected and diagnosed, and automated production and intelligent control can be realized. For example, on the production line, PLC programs are used to control relays, solenoid valves, motors and other actuators for coordinated management, and automatically complete tasks such as processing, assembly, sorting, and testing.

Electrical control technology is widely used in modern industry and life, and any field involving machine control, power control, security control, traffic control, household appliances and other aspects needs the support of electrical control equipment and technology.

Electrical control refers to the use of electrical equipment and electronics to control the operation and working status of mechanical devices or industrial machines. Electrical control plays an extremely important role in modern industry, such as automated production lines, industrial robots, generator control, etc., all need electrical control equipment to achieve. Common electrical control devices include control circuits, control power sources, controllers, contactors, relays, PLC (programmable logic controllers), etc.

Through these devices, machines or devices can be controlled, monitored, protected and diagnosed, and automated production and intelligent control can be realized. For example, in the production line, PLC program control relays, solenoid valve clusters, motors and other actuators are used for coordinated management, and tasks such as processing, assembly, sorting, and testing are automatically completed. Electrical control technology is widely used in modern industry and life, and any field involving machine control, power control, security control, traffic control, household appliances and other aspects needs the support of electrical control equipment and technology.

Electric shock. What would you like to ask about the electrocution? How does electric shock work? Or whatever.