Compressor control modes
Stop the compressor and switch off the voltage before connecting external equipment. Only
voltage-free contacts are allowed.
The following control modes can be selected:
• Local control: The compressor will react to commands entered by the buttons on the control panel.
Compressor start/stop commands via Clock function are active, if programmed.
• Remote control: The compressor will react to commands from external switches. Emergency stop remains
active. Compressor start/stop commands via Clock function are still possible.
For remote starting and stopping:
• Connect a start/programmed stop button (S1') between terminals 30 and 33 of terminal (2x27) (input
DIO3 on the controller).
• Bridge terminals 30 and 39 of terminal (2x27) (input DIO4 on the controller) or connect a load/unload
switch (S2').
In this mode, the outlet pressure is still sensed by pressure transducer (PT20), resulting in loading and
unloading of the compressor at the pressures programmed in the Elektronikon regulator. If the
mentioned terminals are not bridged, the compressor is switched out of automatic load/unload operation
and remains running unloaded.
For remote loading/unloading (via external pressure switch):
Compressors with an Elektronikon Graphic controller can also be wired to load and unload depending
from the status of a pressure switch: Connect a load/unload (pressure) switch (S2') between terminals 30
and 39 of terminal (2x27) (input DIO4 on the controller). This results in loading and unloading of the
compressor at the closing and opening pressures of the external pressure switch respectively.
• LAN control: The compressor is controlled via a local network. Consult Atlas Copco.
See section Electrical system to locate the connectors.
6.4 Pictographs
Description
Pictographs
Reference Designation
1 Manual condensate drain
2 Automatic condensate drain
3 Warning: voltage
4 Warning: switch off the voltage and depressurise compressor before repairing
Instruction book
2920 7090 51 131
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