Pressure Switch Compressor Control

A pneumatic compressor control circuit starts and stops the compressor according to receiver pressure. This control schematic uses a pressure switch as the demand signal. When pressure falls below its cut-in setting, the switch closes and energizes the contactor coil, subject to the stop and overload contacts. The contactor output also powers a run pilot light. At the cut-out pressure, the pressure switch opens and the compressor stops. The motor power circuit, starter rating, and earth connection belong on the associated power drawing. Set the pressure-switch range, overload, and contactor coil voltage for the actual compressor installation. Include manual isolation in the installation documentation.