2.6 Regulating system
Flow diagram
Unloading
If the air consumption is less than the air output of the compressor, the net pressure increases. When the net
pressure reaches the unloading pressure, solenoid valve (Y1) is de-energised.
• The control pressure present in the chambers of loading plunger (LP) and unloading valve (UV) is vented
to atmosphere via solenoid valve (Y1).
• Loading plunger (LP) moves upwards and causes inlet valve (IV) to close the air inlet opening.
• Unloading valve (UV) is opened by the pressure in the oil separator vessel. The pressure from the oil
separator vessel is released into atmosphere through the unloader (UA).
• The pressure in the oil separator vessel stabilises at low value. A reduced amount of air is compressed to
guarantee a minimal pressure, required for lubrication during unloaded operation.
Air output is stopped (0%), the compressor runs unloaded.
Loading
When the net pressure decreases to the loading pressure, solenoid valve (Y1) is energised.
• Control pressure is fed from the oil separator vessel via solenoid valve (Y1) to loading plunger (LP) and
unloading valve (UV).
• Unloading valve (UV) closes the air blow-off opening. Loading plunger (LP) moves downwards and
causes inlet valve (IV) to open fully.
Air delivery is resumed (100%), the compressor runs loaded.
2.7 Electrical system
General
Also consult sections Electrical diagrams and Electrical connections.
The electrical system comprises following components:
Instruction book
20 2920 7090 51
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