Reading Method of Electrical Control Circuit Diagram of Building Equipment

The electrical control diagram is drawn based on the principle of being simple and clear, easy for readers to read and analyze. The component positions in the drawing are not based on the actual positions, and only the required electrical components and wiring terminals are drawn.
The circuit diagram is divided into two parts: main circuit and auxiliary circuit. The main circuit is the part through which strong current passes in electrical control, and is composed of power circuit, protection circuit and contact elements; The auxiliary circuit includes power circuit, control circuit and protection circuit, and is composed of contactor coil, relay coil and the dynamic contact and dynamic contact elements. The main circuit is generally represented by thick solid lines, and the auxiliary circuit is generally represented by thin solid lines. As shown in Figure 5-17, in the electrical control diagram of an electromechanical control system, thick solid lines are used to draw the main circuit, and thin solid lines are used to draw the auxiliary circuit, which is convenient for circuit analysis.
Each component and equipment of the circuit diagram shall be represented according to the graphic symbols specified by the state, and text symbols or project codes shall be marked beside the graphic symbols to indicate the level, location and type of electrical components.
The electrical control circuit can realize various control functions, such as forward and reverse rotation, sequence control, time control, etc. The control circuit is the different combination of several electrical components, thus constituting several basic links. If you are familiar with the composition and principle of the basic links, any complex circuit diagram will be readily solved. The basic links of commonly used control circuits are as follows.

Rural power grid transformation drives the industrial chain of electrical equipment

To create value for customers is to create the future for ourselves!

Rural power grid transformation drives the industrial chain of electrical equipment

To create value for customers is to create the future for ourselves!

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Method for reading electrical control circuit diagram of building equipment

Theelectricalcontroldiagramisdrawnaccordingtotheprincipleofsimpleandclear,easyreadingandanalysisbythereader.Thepositionofthecomponentsinthedrawingisnotdrawnaccordingtotheactualposition,andonlytherequiredelectricalcomponentsandterminalsaredrawn. Thecircuitdiagramisdividedintotwoparts:amaincircuitandanauxiliarycircuit.Themaincircuitisapartthroughwhichastrongcurrentpassesintheelectricalcontrol,andiscomposedofapowersupplycircuit,aprotectioncircuit,andacontactelement;theauxiliarycircuithasapowersupplycircuit,acontrolcircuit,andaprotectioncircuit,andthecontactorThecoil,therelaycoil,andthemovingcontactandthebreakingcontactelementarecombined.Themaincircuitisgenerallyindicatedbyathicksolidline,andtheauxiliarycircuitisgenerallyindicatedbyathinsolidline.AsshowninFigure5-17,theelectricalcontroldiagramofanelectromechanicalcontrolsystemisdrawnwithathicksolidline,andtheauxiliarycircuitisdrawnwithathinsolidline,whichisconvenientforanalyzingthecircuit. Eachcomponentanddeviceofthecircuitdiagramisrepresentedbyagraphicalsymbolspecifiedbythestate,andatextsymboloritemcodeisindicatednexttothegraphicsymboltoindicatethelevel,positionandtypeoftheelectricalcomponent. Theelectricalcontrolcircuitcanimplementvariouscontrolfunctionssuchasforwardandreverse,sequentialcontrol,timecontrol,andthelike.Thecontrolcircuitisadifferentcombinationofseveralelectricalcomponents,whichconstitutesseveralbasiclinks.Ifyouarefamiliarwiththestructureandprincipleofthebasiclink,anycomplicatedcircuitdiagramwillbesolved.Thebasicpartsofthecommonlyusedcontrolcircuithavethefollowingparts.

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