VPK COMPRAG A1108, Manual

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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 and reaches the upper limit of working pressure (unloading pressure). The
controller (2) stops energize the solenoid valve (3), the valve opens, the air pressure from
the separator tank (4) closes the damper (5) of the suction valve (1), and the compressor’s
pneumatic system is unloaded through the throttle.
Loading:
When the net pressure decreases to the loading pressure, the controller (2) energizes the
solenoid valve (3). Air pressure from the separator tank (4) is interrupted and the damper (5)
opens. Air suction resumes and the compressor runs loaded.