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.
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Scenario
Receiver pressure control
Key decisions
- Pressure input: The pressure switch requests compressor operation.
- Protection: Put overload protection in series with the contactor coil.
- Status: Feed the run lamp from the contactor output.
When to reuse this
Use for the control portion of a compressor that fills a pneumatic receiver.
Frequently asked questions
What does a compressor pressure switch do?
Why include an overload contact?
Is this the motor power circuit?
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