Machine keeps running loaded past cut-out, or won't go to standby.
1
Unloader/inlet valve stuck open
Rotary screw
CheckWatch inlet valve butterfly at commanded unload — should close fully.
FixClean or rebuild inlet valve; check pilot solenoid and control air supply.
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2
Pressure transducer reading low
Rotary screw
CheckCompare controller reading to a calibrated gauge at the same point.
FixReplace transducer; verify wiring and shield grounding.
ToolsCalibrated test gauge
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3
Blowdown/vent solenoid failed
Rotary screw
CheckListen/feel for sump venting on unload command.
FixReplace solenoid coil or valve body.
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4
Pressure switch contacts welded (recip)
Reciprocating
CheckWith power off (LOTO), inspect switch contacts for pitting/welding.
FixReplace pressure switch.
SafetyLOTO and verify zero energy before opening pressure switch enclosure.
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5
Controller setpoint misconfigured
Rotary screw
CheckVerify unload/stop setpoint in HMI vs OEM defaults.
FixReprogram to correct value.
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Safety
Lockout/tagout before opening enclosures. Verify zero energy. Bleed system pressure before opening any pneumatic connection.