Safety relief opens or pressure exceeds setpoint.
1
Pressure switch / transducer drift
CheckCompare gauge to controller reading; calibrate transducer.
FixAdjust setpoint or replace transducer.
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2
Unloader / inlet valve fails closed
highCheckWatch inlet valve at cut-out — must open to unload airend.
FixRepair pilot signal, clean valve, replace solenoid.
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3
Wrong relief valve set pressure
criticalCheckRelief valve set pressure must never exceed the vessel's ASME nameplate MAWP; code typically allows set pressure up to the vessel MAWP, with valve sized/set per the vessel nameplate, not an arbitrary value.
FixReplace with correct ASME-stamped valve.
SafetyNever plug or replace a safety relief with a higher setting.
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4
Controller programmed incorrectly
Rotary screw
CheckVerify load/unload setpoints in HMI.
FixReprogram per OEM defaults.
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Safety
Lockout/tagout before opening enclosures. Verify zero energy. Bleed system pressure before opening any pneumatic connection.