Design and Function
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When the maximum pressure is reached the machine switches to idle running. 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.
VARIO
The VARIO control mode is an extension of DUAL control. The difference from DUAL being
that under VARIO control the idling time is automatically increased or decreased corre-
sponding to the increased or decreased switching frequency of the drive motor.
QUADRO
In QUADRO control mode the machine switches from LOAD to IDLE during periods of high
air demand and directly from LOAD to STANDSTILL during periods of low air demand.
This mode of control requires two pre---set time periods: the running time and the idle/
standstill time. The shorter these time settings, the sooner and more frequently the motor is
stopped.
4.3.4 Modulating control (option C1)
The modulating control mode is an extension of DUAL control. The difference being that, in
this mode, the delivery of the compressor is steplessly varied within the control range of
the machine.
Increasing air demand
The machine operates between PARTIAL LOAD and LOAD.
Falling air demand
The machine operates between PARTIAL LOAD, IDLE RUNNING and STANDSTILL.
4.4 Safety Devices
The following safety devices are provided and may not be changed:
EMERGENCY STOP button
The EMERGENCY STOP button shuts down the compressor immediately. The motor
remains still. The pressure system is vented.
Pressure relief valve
The pressure relief valve protects the system from excessive pressure. This is factory
set.
Housing and covers for moving parts and electrical connections.
Protection from accidental contact.
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