    (1) Look at the power supply. See if the auxiliary circuit uses AC voltage or DC power, where the power comes from. The level of the power supply voltage. Generally, the two phase line power supplies from the main circuit have a line voltage of 380V; a phase line and a neutral line are drawn from the main circuit. Its phase voltage is 220V. The power supply voltage from the transformer is usually 24, 36V and 127V.
    (2) Look at the control relationship of the auxiliary components to the main circuit electrical appliances. The auxiliary circuit is a large circuit.
    Large loops often contain several small loops. For the circuit of Figure 1-8, after the SB2 start switch is pressed, the large circuit is formed, the KM relay coil is energized, the KMI is self-locking after the suction, and the KM2-KM4 is closed to make the M motor work.
    (3) Look at the constraint relationship between the control elements in the auxiliary circuit. This is useful for identifying the interrelationships between the various components.
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