A-3-7 air compressor control circuit

Air compressors (air compressors) are electrical equipment commonly used in factories and are generally controlled by electric contact pressure gauges .
    The circuit is shown in Figure 5-1. The circuit can be operated automatically and manually.
    In the figure, KP is an electric contact pressure gauge . When the air pressure reaches the upper limit (such as 0.6MPa), contacts 1 and 3 are closed;
when the air pressure begins to fall below the lower limit (such as 0.4MPa), contacts 1-2 closure. Through the control circuit ,
the pressure in the gas storage tank can always be maintained within the required range of 0.4~0.6MPa.