QUADRO
Unlike the DUAL regulating mode, the machine will switch from LOAD to READY in QUADRO
mode after periods with low compressed air consumption.
After periods with a high compressed air consumption, the machine will switch from LOAD to
READY after passing through IDLE.
In this control mode, the controller requires two specified times: The
running time
and the
idling/
standstill time
.
The shorter these times are set, the sooner (and more frequently) the motor is stopped.
VARIO
The VARIO mode is based on the DUAL control mode. Unlike the DUAL regulating mode, the
idling time
is automatically lengthened or shortened to compensate for higher or lower machine
starting frequencies.
CONTINUOUS
Unlike 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. However, the machine does
not switch to READY.
DYNAMIC
Unlike the DUAL regulating mode, the machine will switch from LOAD to READY in DYNAMIC
mode at low drive motor temperature.
And from LOAD via IDLE to READY at a high drive motor temperature.
The lower the drive motor temperature, the sooner (and, therefore, more often and longer) it is
stopped.
MODULATING control
The MODULATING control is an additional mechanical regulation. It continuously changes the de‐
livery volume 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.
4.7.3 Frequency-controlled drive (SFC)
If the machine runs in LOAD, the frequency converter compares the ACTUAL value with the TAR‐
GET value of the system pressure and regulates, depending on the difference, the speed of the
compressor motor and the airend.
The speed of the airend determines the rate of compressed air delivery and the working pressure.
If air consumption rises, the frequency converter increases motor speed and therefore increases
the volume of air delivered.
If air consumption drops, the converter reduces motor speed and therefore reduces the volume of
air delivered.
The network pressure remains constant – within the control range of the converter – regardless of
fluctuating air demand.
4 Design and Function
4.7 Operating modes and control modes
32
Service manual Controller
SIGMA CONTROL 2 SCREW FLUID 1.1.3 9_9450 03USE
Option C1
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