■ VARIO
■ MODULATING control
Energy-efficient control modes for various applications:
Application Recommended
control mode
Compressed air station with one machine or several machines with compa‐
rable delivery
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. 36 Energy-efficient control modes
The SIGMA CONTROL is factory set to DUAL control mode unless specifically ordered otherwise.
DUAL
In the DUAL control mode, the machine is switched back and forth between LOAD and IDLEto main‐
tain 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 is
STOPPED.
The shorter the
idling time
setting, 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 low air demand it switches directly to
STANDSTILL.
In this control mode, the controller requires two specified times: The
running time
and the
idle /stand‐
still time
.
The shorter these time period settings, the sooner (and more frequently) the motor is stopped.
VARIO
The VARIOmode is based on the DUAL control mode. In contrast to DUAL, the idle period is auto‐
matically lengthened or shortened to compensate for higher or lower drive motor starting frequencies.
MODULATING control
MODULATING control is based on the DUALcontrol mode. In contrast to DUAL, the air delivery is
continuously varied within the control range of the machine.
This control mode is not available on variable speed machines with a frequency-controlled
drive (SFC).
Compressed air demand Operating modes
rises MODULATING
LOAD
4 Design and Function
4.5 Operating modes and control modes
30
Service Manual Screw Compressor
BSD 9_5708 08 USE
Option C1
Option C1
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