Figure 2-14. - Block diagram.
Figure 2-15. - Wiring diagram.
The wiring diagram is almost a picture drawing. It shows the wiring between components and the relative position of the components. Figure 2-15 shows a wiring diagram of the same motor control system represented by the block diagram in figure 2-14. In the wiring diagram, components are shown much as they would appear in a picture. The lines representing wires are marked with numbers or letter-number combinations. Lines L1, L2, and L3 are incoming power leads. The diagram shows which terminals these power leads are connected to in the motor starter. Leads connected to terminals T1, T2, and T3 are the motor leads.
The numbers without letters mark the control terminals of the starter. Wiring diagrams are often used along with a list of repair parts. Wiring diagrams may be of some help in troubleshooting circuit problems.
Figure 2-16 is a connection diagram. By comparing the symbols from this diagram to those in figure 2-6, you can see that graphic symbols are used to represent parts or components in the connection diagram. The connection diagram in figure 2-16 is a combination of basic symbols (like the open-contact symbol). You can see how the controller pictured in figure 2-15 works internally.
Figure 2-16. - Connection diagram.Continue Reading