4.4.2 MODULATING control
The control system regulates the volume of air generated to match the actual demand. The ma‐
chine keeps the working pressure constant by varying the volume of compressed air delivered,
thereby matching the air demand.
With the help of a mechanical control valve (the proportional controller), the opening and closing of
the inlet valve is continuously varied in relation to the actual air demand. The airend provides com‐
pressed air for connected consumers.
This stepless delivery regulation minimises fuel consumption of the engine. The load and fuel con‐
sumption of the engine rises and falls with the air demand.
4.5 Safety devices
4.5.1 Monitoring functions with shutdown
The following functions are monitored automatically.
■ Engine oil pressure
■ Coolant temperature
■ Airend discharge temperature
■ Engine alternator
The fuel stop device is activated when an alarm occurs. The engine comes to a stop and the
venting valve releases pressure from the machine.
4.5.2 Further safety devices
The following safety devices are provided and may not be modified in any way.
■ Pressure relief valve:
This valve protects the system from excessive pressure. It is factory set.
■ Enclosures and covers over moving parts and electrical connections:
These protect against accidental contact.
4.6 Options
4.6.1 Option ea
Tool lubricator
Compressed air containing lubricating oil is needed for the lubrication of certain air tools. A tool lu‐
bricator serves this purpose.
WARNING
Lubrication with tool oil.
Air tools that must not be lubricated can be damaged.
➤ Blow any residual oil out of the line before connecting such an air tool.
The amount of oil in the compressed air is controlled by a metering valve on the lubricator.
The oil can be cut off completely by a shut-off valve.
The shut-off valve is in the air pipe.
4
Design and Function
4.5
Safety devices
No.: 9_9432 02 E
Service Manual Screw Compressor
M43
29
RAMIRENT
