Gardner Denver L Series Original User And Service Manual page 44

Fault: Unit switches off.
Potential root cause
Water inlet temperature too high (for water-
cooled compressors only)
Ambient temperature too high
Electric motor defective
Fan is defective
Sensor, connections, or lines defective
Supply cable cross section too small for
electrical lines
Oil level too low
Oil injection pressure too low
Oil temperature too high
Compressor defective
Fault: Idle pressure too high
Potential root cause
Compressor does not give relief
Intake regulator does not close completely
Fault: Oil in the air filter
Potential root cause
Suction regulator non-return function defective
Continuous Emergency-Off deactivation
Fault: Pressure Relief Valve opens
Potential root cause
Pressure Relief Valve defective
Network pressure sensor defective
Final compression pressure sensor defective
Electronic controls defective
Oil fine separator soiled
Intake regulator does not close completely
Also note the fault messages on the display of the operator panel.
The corresponding actions to clear the faults are described in the operating instructions for the
electronic controls.
Remedy
Check cooling water feed.
Ventilate the compressor room.
Check the electric motor and posistor.
Check fans, replace if needed.
Check sensors, connections, and lines.
Measure current draw; replace lines if needed.
Top up oil in the pressure vessel
Replace oil filter cartridge. Clean oil system
Check oil cooler and fan / check oil temperature, check
cooling water circuit (only for water-cooled systems)
Replace compressor
Remedy
Check suction regulator, blow-off solenoid valve and
pressure-retaining and non-return valve, and replace if
necessary.
Make the intake regulator moveable, replace if needed.
Check solenoid valves and pressure reducing valve.
Remedy
Check non-return valve; replace if necessary.
Emergency-Off may only be used for safety-related
function problems
Remedy
Replace pressure relief valve.
Replace network pressure sensor.
Replace final compression pressure sensor
Replace electronic controller.
Replace oil fine separator cartridge
Check solenoid valves and pressure reducing valve,
replace if necessary.
Make the intake regulator moveable, replace if needed.
NOTICE
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