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WORKING CYCLE
• At the end of the starting cycle, the compressor reaches maximum operating speed and starts to compress air in the
tank (4).
• At a value of - 0.5 bar operating pressure, the compressor begins to modulate the motor rotation frequency (max. 100%, min.
50%) in such a way as to maintain constant the selected pressure depending on the flow of air.
• The compressed air cannot outlet of the minimum pressure valve (5) which is adjusted at about 4 bars.
• The compressed air compresses the oil inside the tank (4) and forces it to flow through the tubing (7) towards the thermostatic
filter (10). If the oil temperature is lower than the temperature calibration of the thermostatic element, the oil returns to the screw
through the hoses (9) . If the oil temperature is higher than the temperature calibration of the thermostatic element, the oil is
flowing in the radiator (8) where it is cooled.
• Subsequently, the oil passing through the pipe (9) reaches the compressor, mixing with the suction air and thereby creating
an air/oil mixture which ensures sealing and lubrication of the moving organs of the compressor.
• The air/oil mixture goes back to tank (4), where air and oil are first separated by centrifugation and then by the oil separator
filter (6).
• Therefore only air exits the tank (4), which through the tubing (3) reaches the air radiator (8) passing through the condensate
separator and going to the network.
• The condensate recovered in the condensate separator (8) is automatically released by the timed solenoid valve (12)
• Min. pressure valve (5) serves also as a check valve.
• Compressor delivers compressed air to outer air tank.
• Once min. value is reached, pressure gauge starts timer and powers off solenoid valve (1) of regulator.
• Regulator (2) closes and compressor stops compressing and starts idling.
• Timer continues counting until reaching set value and, if pressure is unchanged, stops the electric motor. If pressure drops to
minimum value set on controller, solenoid valve is powered and opens before timer counting is over.
• Regulator (2) opens and compressor operates under normal load; timer is reset.
• This cycle is automatically repeated.
10
START-UP AND OPERATION
olio / oil
aria+olio / air+oil
aria / air
9
11
1
2
3
9
8
3
NOBEL DV 30-37 CSA - Cod.197EE0612ML - Rev.2 09/2019
5
6
4
7
EN
13
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