• Unloading valve/blow-off valve (UV) moves upwards, connecting the oil separator tank pressure (1) with
channels (2) and (3).
• The pressure in channel (2) causes the loading plunger (LP) to move upwards, causing inlet valve (IV) to
close, while the pressure is gradually released to atmosphere.
• The pressure in the separator tank stabilises at low value. A small amount of air is kept drawn in to
guarantee a minimal pressure, required for lubrication during unloaded operation.
Air output is stopped, the compressor runs unloaded.
2.7 Electrical system
Electrical components
The electrical system comprises following components:
Typical Example of electric cubicle on GA 55
+
up to GA 90
Reference Designation
F1/2/3 Fuses
F7/F8/F9 Fuses (only on Full-Feature)
F21 Overload relay, compressor motor
Q15 Circuit breaker, fan motor (on air-cooled compressors)
K5 Auxiliary relay
K11 Auxiliary contactor
K12 Auxiliary contactor
K15 Auxiliary contactor, fan motor (on air-cooled compressors)
K21 Line contactor
K22 Star contactor
K23 Delta contactor
Instruction book
2920 7109 60 23
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