4.6 Operating States and Control Modes
4.6.1 Operating states of the machine
The machine operates in the following states:
■ LOAD:
The inlet valve is open. The airend delivers compressed air to the compressed air system.
The drive motor runs under full load.
■ IDLE:
The inlet valve is closed. The minimum pressure/check valve shuts off the oil separator from the
compressed air system. The oil separator tank is vented.
A small volume of air circulates through the bleed hole in the inlet valve, through the airend and
back to the inlet valve via the venting valve.
The drive motor runs unloaded and consumes very low power.
■ STOPPED:
The inlet valve is closed. The minimum pressure/check valve shuts off the oil separator from the
compressed air system. The oil separator tank is vented.
The drive motor is stopped.
■ PARTIAL LOAD:
With the help of a control valve (the proportional controller), the degree of opening of the inlet
valve is continuously varied in relation to the actual air demand. The airend delivers compressed
air to the compresses air system.
The load and power consumption of the drive motor rises and falls with the air demand.
The regulating valve is factory set. Consult with authorized KAESER Service representative be‐
fore making alterations.
4.6.2 Control modes
Using the selected control mode, the controller switches the compressor between its various opera‐
tional states in order to compensate for air being drawn off by consumers and maintain system
pressure between the set minimum and maximum values.
SIGMA CONTROL can work with the following control modes:
■ DUAL
■ QUADRO
■ VARIO
■ MODULATING control
DUAL
In the DUAL control mode, the compressor is switched back and forth between LOAD and IDLE to
maintain network pressure between the set minimum and maximum values. When the maximum
pressure is reached the machine switches to IDLE. When the preset
idling time
has elapsed the
machine is STOPPED.
The shorter the
idling time
setting is made, the sooner (and more frequently) the motor is stopped.
QUADRO
In the QUADRO mode, the controller operates as in the DUAL mode during periods of high air demand
by switching between LOAD and IDLE but during periods of high air demand it switches directly
between LOAD and STOPPED.
This mode of control requires two pre-set time periods: the
running time
and the
idling to stop
time.
4 Design and Function
4.6 Operating States and Control Modes
28
Service Manual Screw Compressor
ASD T Tri-Voltage 9_5721 06 USE
Option C1
Option C1
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