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11. Trouble-shooting
50
Malfunction
Possible cause
Remedy
Unit switches off
1.
Ambient temperature too high
1.
Ventilate compressor room
2.
Electric motor defective
2.
Check electric motor and thermistor
3.
Fan defective
3.
Check/replace fan
4.
Cross section of the electric supply
lines too small
4.
Measure power requirement,
if necessary, replace lines
5.
Power requirement too high
5.
Oil fine separator clogged,
replace, if necessary
6.
Oil level too low
6.
Top up oil in the pressure reservoir
7.
Oil injection pressure too low
7.
Replace oil filter cartridge,
clean oil system
8.
Excessive oil temperature
8.
Check oil cooler and fan/
Check oil thermostat
1.
Suction regulator does not close
correctly
1.
Check suction regulator
Excessive idling
pressure
2.
System not unloaded
2.
Check suction regulator
Oil in the compressed air
1.
Oil fine separator defective
1.
Replace oil fine separator cartridge
2.
Oil foams
2.
Change oil
3.
Oil level too high
3.
Drain off oil
4.
Minimum pressure valve defective
4.
Check minimum pressure valve
Oil in the air filter
1.
Suction regulator setback function
defective
1.
Check suction regulator
2.
Suction regulator does not close
correctly
2.
Check suction regulator
3.
Frequent emergency shutdown
3.
The emergency shutdown may only be
activated in the case of safety-relevant
functional problems
Pressure relief valve
opens
1.
Pressure relief valve defective
1.
Replace
2.
Oil fine separator clogged and final
compression pressure sensor defective
2.
Replace oil fine separator cartridge and
change final compression pressure
sensor
3.
Suction regulator closes too slowly
3.
Check suction regulator and solenoid
valve
4.
Mains pressure sensor defective
4.
Replace mains pressure sensor
5.
Electronics defective
5.
Replace electronics
DANGER
Never operate the screw compressor with defective pressure relief valve!