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Figure 4-6 is a wiring diagram of the same
motor control system shown by the block
diagram. You can see that instead of blocks
being used to show components, a picture of
the component is used. You can also see that
the lines used to show the wiring are marked
with numbers or letter-number combinations.
Lines L1, L2, and L3 are incoming power
leads, and the diagram shows the terminals
in the starter to which they are connected,
Wiring diagrams are often used along with a
list of repair parts and are helpful in
troubleshooting problems.
CONNECTION DIAGRAMS
Figure 4-7 is a connection diagram. It
makes use of diagram symbols instead of
pictures to show components. It also shows
all the internal and external circuit
connections. These connections can be read
and traced more easily than on a wiring
diagram. In the connection diagram, the
components are still shown in their relative
positions. This diagram may be used when
you are connecting the wiring or tracing any
part of the circuit. Remember that the
connection
diagram
is
a
valuable
troubleshooting tool. It is often found inside
the cover of a piece of equipment. The
dotted line indicates a single component.
Figure 4-6.—Wiring diagram.
4 - 8
SCHEMATIC/SINGLE-LIINE
DIAGRAMS
The schematic diagram is a drawing that shows
the electrical plan of operations of a piece of
equipment or component. The relative position of
parts is not shown in this type of diagram. The
schematic diagram, like the connection diagram,
makes use of symbols instead of pictures. The
schematic shown in figure 4-8 is a plan
Figure 4-7.—Connection diagram.
Figure 4-8.—Schematic diagram.
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