Control Circuit Schematic. If the motor does not have the auxiliary contact and no option for installing one then the circuit must be slightly adjusted. Two wire circuits may incorporate several different external sensing devices as shown in figure 18 4.
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A schematic diagram of the circuit in figure 18 2 is shown in figure 18 3. Figure 2 shows a typical line or schematic diagram. Interpret this ac motor control circuit diagram explaining the meaning of each symbol.
Pressure switch is used to control the motor starter.
Pressure switch is used to control the motor starter. Two wire control circuits are so named because only two wires are required to control the operation of the circuit. You must have access to a double pole relay with either double throw or both normally open contact sets. They are an ideal means for troubleshooting a circuit.