Compressed air demand Operating modes
falls MODULATING
IDLE
STANDSTILL
Tab. 37 Operating modes under MODULATING control
4.6 Safety Devices
The following safety devices are provided and may not be modified in any way.
■ EMERGENCY STOP button:
The EMERGENCY STOP button shuts down the machine immediately. The motor remains stop‐
ped. The pressure system is vented.
■ Safety relief valve:
The pressure relief valve protects the machine from excessive pressure. It is preset at the factory.
■ Enclosures and guards for moving parts and electrical connections
These protect against accidental contact.
4.7 SIGMA CONTROL Keys and Indicators
Fig. 9 Keys
Item Description Function
1 «ON» Switches on the machine.
The programmed operating mode is active.
2 «OFF» Switches the machine off.
3 «Clock» Switches clock control on and off.
4 «Remote control» Switches remote control on and off.
5 «LOAD/IDLE» Toggles the compressor between LOAD and IDLE operating modes.
6 «DOWN» Scrolls down the menu options.
Reduces a parameter value.
4 Design and Function
4.6 Safety Devices
9_5708 08 USE
Service Manual Screw Compressor
BSD
31
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