Duringthe maintenance operation of theelectrician,circuitdiagrams always play a crucial role, and it is not an exaggeration to say that thecircuitdiagram is the foundation of the electrician’s principles. As the saying goes, a good electrician may not be a great electrician, but an electrician who cannot read circuit diagrams is definitely not a qualified electrician! Circuit diagrams are the basic entry-level knowledge for electricians. I believe every electrician has come into contact with circuit diagrams. Circuit diagrams are compulsory courses for electricians. If you don’t understand how to read circuit diagrams, then you really feel like a “fake electrician”. Whether it is macro power drive lines, electronic circuits, circuit boards,PLC,instrumentconfiguration, etc., circuit diagrams are the foundation. These are developed on the basis of circuit diagrams. Circuit is a compulsory course, so how do you understand the circuit diagram?1. Accumulation of theoretical knowledge.Building a high-rise building starts from the ground. It is necessary to have a certain accumulation of knowledge for the electrician to read the circuit diagram, such as: single-phase electricity andalternatingcurrent, the basic principles of the circuit, thedirection of the current, the calculation ofvoltage, the definition of the ratedpower, etc. These basic electrical theoretical knowledge need to be accumulated because this is the foundation of the foundation.2. Mastering a certain amount of theoretical knowledge, it is also necessary to clarify the composition and function of the circuit’s components.In general, circuit diagrams are all composed of thermalrelays, fuses, AC contactors, buttonsswitches, timerelays, limit switches, etc. components. You should first recognize these components and understand the role of the components in the circuit.
For example: the thermal relay mainly plays the role ofoverloadprotectionin the circuit, and the fuse mainly plays the role of short-circuit protection.
AC contactors play a small currentcontrollarge current, indirectly control the operation of the circuit, etc.Three, be familiar with and understand the symbols of the components often used in the circuit.Generally, circuit diagrams are allelectricalcomponent symbols connected by wires, which is the international standard for drawing and viewing.
For example: KM～AC contactor. SB1, SB2 buttons, FR thermal relay, KT time relay, FU circuit fuse, etc., these commonly used basic circuit element symbols should be familiar.
Four, master the basic operation principle and usage skills of circuit components.In general, any circuit component has its own structure and operation principle. It is very necessary to be familiar with and master the usage method of the components!Example: When the AC contactor operates and attracts, the corresponding main contact changes from normally open to closed, and the auxiliarycontact changes from normally open to closed, and from normally closed to open. The thermal relay is generally installed in the mainloop to protect the equipment from overloading, but the auxiliary contact needs to be connected to the control loop to control the circuit.Five, the electrical circuit diagram needs to be “dynamically” analyzed.
Circuit diagrams are the foundation of electrical technology, and mastering and proficiently understanding circuit diagrams is a basic skill that electricians must possess.
