Pressure switches on air compressors are critical components used to indicate when the pressure in the tank has reached a set point. If a pressure switch is improperly installed or fails to function properly, the compressor will not be able to provide the pressure needed to power tools or other machinery. Understanding the wiring diagram for a pressure switch on an air compressor is essential for proper installation and operation.
How Pressure Switches Work
Pressure switches are composed of two main parts – an electrical contact and a diaphragm. When the pressure inside the tank reaches the set point, the diaphragm is pushed up and causes the electrical contact to close. This completes an electrical circuit which activates the compressor motor. The diaphragm is connected to a spring which is adjustable to different levels of pressure. As the pressure falls below the set point, the spring pushes the diaphragm back down and the electrical contact opens, shutting off the compressor motor.
Understanding the Wiring Diagram
The wiring diagram for a pressure switch on an air compressor will typically include three terminals. The terminals are labeled L1, L2, and P. The L1 terminal is connected to the power source, while the L2 terminal is connected to the compressor motor. The P terminal is connected to the pressure switch. The wiring diagram will also include a symbol indicating the type of switch used, typically a double-pole single-throw (DPST) switch. If a double-pole double-throw (DPDT) switch is used, the diagram will indicate this as well.
Installing Pressure Switches
When installing pressure switches, it is important to follow the manufacturer’s instructions and the wiring diagram provided. It is also important to use the correct type of switch, as different applications require different types of switches. Once the switch is installed, the pressure should be tested to ensure that the switch is functioning properly. If the switch is not working correctly, it should be checked for loose connections and other potential problems.
Conclusion
Pressure switches are essential components for air compressors and must be installed correctly in order to ensure proper operation. Understanding the wiring diagram for a pressure switch is essential for proper installation and maintenance. With the right knowledge and attention, pressure switches can provide years of reliable service.
