Since wiring connections and terminal markings are shown, this type of diagram is helpful when wiring the device or tracing wires when troubleshooting. Bold lines denote the power circuit and thin lines are used to show the control circuit. Black wires are conventionally used in power circuits and red wire in control circuits for AC magnetic equipment.
A wiring diagram is limited in its ability to completely convey
the controller’s sequence of operation. The elementary diagram is used where an illustration of the circuit in its simplest form is desired.
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