COMPRAG FRD-0508 500л, 11410110 - Инструкция по эксплуатации - Страница 14

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Version 1.3

2.5 Regulating system

Fig. 2.5 Regulating system

The  system  is  controlled  by  an  electronic  controller  t-Log  (4)  which  keeps  the  net  pressure 

within programmable pressure limits by automatically loading and unloading the compressor 
in relation to air consumption.

Unloading: 

If air consumption is less than the air delivered by the compressor, the net 

pressure increases. When the net pressure reaches the upper limit of working pressure 
(unloading pressure), the solenoid valve (6) is de-energized. The damper (2) of the intake 
valve (1) closes the air inlet opening by a spring force:

1. The control pressure present in the chambers of the loading plunger (3) and the unloading 
valve (5) is vented into the atmosphere via the solenoid valve (6).

2. The loading plunger (3) moves forwards and causes the intake valve (1) to close the air 
inlet opening.

3. The unloading valve (5) is opened by the air-oil separation tank pressure. The pressure 

from the air-oil separation tank (7) is released towards the air inlet.

4. The pressure is stabilized at a low value, air output is stopped (0 %) and the compressor 

runs unloaded.

Loading: 

When the net pressure decreases to the loading pressure, the solenoid valve (6) is 

energized:

1. The control pressure is fed from the air-oil separation tank (7) via the solenoid valve (6) to 

the loading plunger (3) and the unloading valve (5). 

2. The unloading valve (5) closes the air blow-off opening. The loading plunger (3) moves 

backwards and causes the intake valve (1) to open fully. Air output is resumed (100 %), and 

the compressor runs loaded.

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