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9. Trouble-shooting
Malfunction
Unit switches off
Excessive idling
pressure
Oil in the compressed air
Oil in the air filter
Safety valve opens
Danger
Never operate the screw compressor with defective safety valve!
48
Possible cause
1.
Ambient temperature too high
2.
Electric motor defective
3.
Fan defective
4.
Sensor, connections or lines defective
5.
Cross section of the electric supply
lines too small
6.
Power requirement too high
7.
Oil level too low
8.
Oil injection pressure too low
9.
Excessive oil temperature
1.
Intake regulator does not close correctly
2.
System not unloaded
1.
Oil fine separator defective
2.
Oil foams
3.
Oil level too high
4.
Minimum pressure valve defective
5.
Orifice of oil extractor clogged
(-13- Fig. 3)
1.
Intake regulator setback function
defective
2.
Intake regulator does not close correctly
3.
Frequent emergency shutdown
1.
Safety valve defective
Oil fine separator clogged and final
2.
compression pressure sensor defective
Intake regulator closes too slowly
3.
4.
Mains pressure sensor defective
5.
Electronics defective
Remedy
1.
Ventilate compressor room
2.
Check electric motor and thermistor
3.
Check/replace fan
4.
Check sensors, connections and lines
5.
Measure power requirement,
if necessary, replace lines
6.
Oil fine separator clogged,
replace, if necessary
7.
Top up oil in the pressure reservoir
8.
Replace oil filter cartridge,
clean oil system
9.
Check oil cooler and fan/
Check oil thermostat
1.
Check intake regulator
Check solenoid valves
2.
Check solenoid valves
1.
Replace oil fine separator cartridge
2.
Change oil
3.
Drain off oil
4.
Check minimum pressure valve
5.
Remove and clean orifice
1.
Check intake regulator
2.
Check intake regulator
Check solenoid valves
3.
The emergency shutdown may only be
activated in the case of safety-relevant
functional problems
1.
Replace
Replace oil fine separator cartridge and
2.
change final compression pressure
sensor
Check intake regulator and solenoid
3.
valves
4.
Replace mains pressure sensor
5.
Replace electronics
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