Schematic  Diagram

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Figure 2-17.—Schematic diagram. The connection diagram shows all the internal and external connections. The circuitry can be traced more easily than on the wiring diagram. The components are still shown in their relative positions. This diagram can be used to help you connect all the wiring and trace any part of the circuit.  The  connection  diagram  is  a  valuable troubleshooting  tool. This type of diagram is often found inside the access cover of a piece of equipment. Schematic  Diagram The schematic or elementary diagram (fig. 2-17) is a  drawing  that  shows  the  electrical  connections  and functions  of  a  specific  circuit  arrangement.  It  facilitates tracing the circuit and its functions without regard to the physical  size,  shape,  or  relative  position  of  the component  device  or  parts.  The  schematic  diagram, like  the  connection  diagram,  makes  use  of  symbols instead of pictures. Figure 2-17 shows, by a schematic diagram, the same motor control system shown in figures 2-14, 2-15, and 2-16. This diagram is laid out in a way that makes the operation of the components easy to understand. This type of schematic diagram with the components laid out in a line is sometimes called a one- line or single-line diagram. Most  schematic  diagrams  are  more  complicated than  ‘the  one  shown  in  figure  2-17.  The  more complicated  ones  can  be  broken  down  into  one-line diagrams, circuit by circuit. You can draw (or freehand sketch) your own one-line diagram by tracing only one circuit,   component   by   component,   through   a multicircuit  schematic,  using  the  symbols  in  figure  2-6. Circuits "A" and "B" in figure 2-18 show only the control  circuit  from  figure  2-16  laid  out  in  one-line form. From these simple circuits, it is easy to see that as soon  as  the  start  button  is  pushed,  the  “M”  coil (operating  coil  of  the  motor  controller)  will  be energized.  The  operating  coil  is  now  held  closed through the "M" contacts. Your   own   freehand   sketches   can   help   you understand other types of diagrams as well as the schematic. You may vary these sketches to suit your needs.  You  may  draw  a  one-line  diagram,  using symbols, from a wiring diagram, an isometric diagram, or a connection diagram, as long as all the necessary details are there for you to convert to lines and symbols. Figure 2-18.—One-line diagram of a motor control circuit. 2-26

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