4.2 Function
Fig. 4 Machine layout
1
Inlet valve
2
Minimum pressure / check valve
3
Drive motor
4
Oil filter
5
Airend
6
Control cabinet
7
Oil separator tank
8
Air filter
9
Oil/air cooler
10
Oil separator cartridge
Ambient air is cleaned as it is drawn in through the filter
8
.
The air is then compressed in the airend
5
.
The airend is driven by an electric motor
3
.
Cooling oil is injected into the airend. It lubricates moving parts and forms a seal between the rotors
themselves and between them and the airend casing. This direct cooling in the compression chamber
ensures a very low airend discharge temperature.
Cooling oil recovered from the compressed air in the oil separator tank
7
and separator car‐
tridge
10
gives up its heat in the oil cooler
9
. The oil then flows through the oil filter
4
and back to
the point of injection. Pressure within the machine keeps the oil circulating. A separate pump is not
necessary. A thermostatic valve maintains optimum cooling oil temperature.
Compressed air passes through the minimum pressure / check valve
2
into the air cooler
9
. The
minimum pressure / check valve ensures that there is always a minimum internal air pressure suffi‐
cient to maintain cooling oil circulation in the machine.
The cooler brings down the compressed air temperature to only 5 K to 10 K above ambient. Most of
the moisture carried in the air is removed during this cooling process.
4.3 Floating relay contacts
Floating relay contacts are provided for the transfer of signals, messages.
Information on location, loading capacity and type of message or signal is found in the electrical
diagram.
4
Design and Function
4.2
Function
22
Service Manual Screw Compressor
SX SIGMA CONTROL BASIC
9_6919 04 E
Summary of Contents for SX
Page 2: ...Original instructions KKW SSX 1 04 en SBA SCHRAUBEN SCB...
Page 6: ...Contents iv Service Manual Screw Compressor SX SIGMA CONTROL BASIC 9_6919 04 E...
Page 8: ...List of Illustrations vi Service Manual Screw Compressor SX SIGMA CONTROL BASIC 9_6919 04 E...
Page 10: ...List of Tables viii Service Manual Screw Compressor SX SIGMA CONTROL BASIC 9_6919 04 E...