KAESER SIGMA CONTROL 2 User Manual

5.7 Operating modes and control modes
5.7.1 Machine operating modes
STOP
The machine is connected to the power supply.
The Controller voltage LED is illuminated in green.
The machine is switched off. The ON LED is extinguished.
READY
The machine has been activated via the «ON» key:
■ The ON LED is illuminated in green.
■ The compressor drive motor has stopped.
■ The inlet valve is closed.
■ The minimum pressure/check valve isolates the oil separator tank from the air system
■ The venting valve is open.
The compressor motor starts as soon as network pressure drops below the specified network pres‐
sure setpoint (cut-out pressure).
Timer and/or remote control can also influence when the compressor motor starts.
LOAD
The compressor motor runs under load:
■ The inlet valve is open.
■ The airend delivers compressed air to the air network.
IDLE
The compressor motor runs unloaded (not for AIRTOWER) and consumes less power:
■ The inlet valve is closed.
■ The minimum pressure/check valve isolates the oil separator tank from the air system.
■ The venting valve is open.
A small volume of air circulates through the bypass bore in the inlet valve, through the airend and
back to the inlet valve via the venting line.
5.7.2 Control modes
In type AIRTOWER compressors it is not possible to set the control modes since there is no
IDLE operating mode. All menus connected to it are then not available.
In order to ensure that gauge working pressure remains between the specified cut-in and cut-out
pressures irrespective of the consumers’ air demand, the controller switches the machine back and
forth between various operating points, depending on the control mode selected. The control mode
also controls the degree of energy efficiency of the machine.
The machine-dependant venting phase between the LOAD and READY operating points ensures
load changes at minimum material stresses.
5 Design and Function
5.7 Operating modes and control modes
No.: 9_9450 13 USE
User Manual Controller
SIGMA CONTROL 2 SCREW FLUID ≥5.1.2
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KAESER SIGMA CONTROL 2 Specifications

General

Controller Type	Microprocessor-based
Model	SIGMA CONTROL 2
Manufacturer	KAESER
Input Voltage	24 V DC
Protection Class	IP54
Communication Protocols	Modbus, Profibus
Data Logging	Comprehensive data logging
Remote Monitoring	Yes
Communication Interface	Ethernet