Faults 4.2 General faults
Page 46 Operating instructions for S 40-3...S 150-3 series screw compressors
Compressor system
does not start up
No electric power to compressor Check electrical connection
Fuses are defective Check the mains fuses and control fuses and replace if necessary
Compressor system has not
vented properly
Check unloading valve and replace, if necessary
Voltage fluctuations in the elec-
trical mains power supply
Ensure constant voltage
Compressor oil is very viscous
due to low ambient temperature
Heat up the compressor system (additional heater available as an
optional accessory)
Oil in suction filter Minimum pressure non-return
valve is leaking
Check the minimum pressure non-return valve and replace,
if necessary
Suction regulator is leaking Check the suction controller and replace, if necessary
Cutout triggered by emergency-
off switch
Normally switched off with O-key
Excessive oil consump-
tion
Drain line is blocked Dismantle and clean drain line
Defective oil separator element Check oil separator and replace, if necessary
Oil filling level too high Drain off oil
Safety valve blows Operating pressure setting
altered from original setpoint
Set operating pressure to maximum permissible pressure of the
screw compressor
Defective safety valve Replace safety valve
System pressure does
not decrease when
switching off
Venting valve does not open Check venting valve and replace, if necessary
Non-return valve is leaking Examine non-return valve and replace, if necessary
Fault Possible cause Rectification
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