QUADRO
In contrast to the the DUAL regulating mode, the machine will switch from LOAD to STANDSTILL
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
STANDSTILL after passing through IDLE.
In this control mode, the controller requires two specified times: The
running time
and the
idle /
standstill time
.
The shorter these times are set, the sooner (and more frequently) the motor is stopped.
MODULATING control
The MODULATING control completes the aforementioned control types.. It continuously changes
the delivery volume within the machine's control range.
Compressed air demand
Operating modes
rises
MODULATING
LOAD
falls
MODULATING
IDLE
STANDSTILL
Tab. 39 Operating modes under MODULATING control
4.7 Refrigeration Dryer Control Modes
The controller can operate in the following modes:
■ CONTINUOUS
■ TIMER
CONTINUOUS
The refrigeration dryer will remain activated even when the machine is in standby.
TIMER
The refrigeration dryer is switched on and off by a timer when the machine is in standby. In this
mode, the operating temperature is held within tight limits.
This mode of control is set up at the factory.
Which control mode is the most practical, and when?
Control mode Advantage
Disadvantage
CONTINUOUS Constant dew point.
Higher power consumption when the machine
is in standby mode.
TIMER
Lower power consumption when
the machine is in standby mode.
Brief increase in dew point when the compres‐
sor re-starts
Tab. 40 Refrigeration dryer control modes
4
Design and Function
4.7
Refrigeration Dryer Control Modes
32
Service Manual Screw Compressor
ASK T SIGMA CONTROL BASIC
9_5717 20 E
Option C1
