KAESER ASK 28, Operating Manual

Page: 45 / 138

The following control modes can be set:
■ DUAL
■ QUADRO
■ VARIO
Supplementary mechanical flow rate regulation:
■ MODULATING control
Energy-efficient control modes for various applications:
Application Recommended
control mode
Compressed air station with one machine or several machines supplying
similar volumes.
VARIO
Machine for peak load in a compressed air station DUAL
Machine for intermediate load in a compressed air station VARIO
Machine for basic load in a compressed air station QUADRO
Tab. 47 Energy-saving control modes
The QUADRO control mode is preset by the factory, unless a different agreement has been made
with the manufacturer.
DUAL
In the DUAL control mode, the machine is switched back and forth between LOAD and IDLE to
maintain the machine working pressure between the preset minimum and maximum values. When
maximum pressure is reached, the machine switches to IDLE. When the preset
idling time has
elapsed, the machine switches to READY.
QUADRO
In contrast to DUAL mode, the machine will switch in QUADRO after short periods between LOAD
to READY after being in IDLE.
Following extended times in the various operating modes, the machine switches from LOAD to
READY.
In this event, the controller considers the time in READY mode as
standstill time. The time in LOAD
and IDLE operating modes are taken as
minimum runtime.
VARIO
The VARIO mode is based on the DUAL control mode. The difference to DUAL is that the
idling
time is automatically lengthened or shortened to compensate for higher or lower machine starting
frequencies.
MODULATING control
The MODULATING control is an additional mechanical regulation. It continuously changes the flow
rate within the machine's control range.
A control valve, the proportional controller, changes the degree of opening of the inlet valve when
the machine transports compressed air into the air network (LOAD)
The load and power consumption of the drive motor rises and falls with the air demand.
4 Design and Function
4.4 Operating modes and control modes
901824 12 E
Operating Manual Screw Compressor
ASK
35
Option C1
Option C1