Atlas Copco Stationary Air Compressors User Manual

Instruction book 

2920 1521 00 

26 

 
A1 Dryer 

(optional) 

F1/11 Fuses 
K11 

Auxiliary contactor, dryer 

K21/24 Contactors 
M1/4 Motors 
M5 

Fan motor, air cooler 

M6 

Fan motor, bodywork 

PT20 

Pressure sensor, air outlet 

Q21/24 Circuit 

breakers 

S3 

Emergency stop button 

TSHH20 

Temperature switch, air outlet protection 

TT11 

Temperature sensor, compressor element 1 (lowest element) 

TT12 

Temperature sensor, compressor element 2 

TT13 

Temperature sensor, compressor element 3 

TT14 

Temperature sensor, compressor element 4 (highest element) 

TT90 

Temperature sensor, dewpoint temperature 

T1/2 Transformers 
1X0 

Terminal strip, mains supply 

1X2 

Terminal strip, dryer 

1X3/6 Terminal 

strips 

 
Fig. 2.8 Service diagram for SF Multi  
 
 
 
Text on Fig. 2.8 
 
(1) Customer’s 

installation 

(2) Door 
(3) 

Higher voltage: Y 
Lower voltage: D 

(4) Dryer 
(5) Optional 
(6) 

Supply of dryer 

(7) 

All other voltages 

(8) 

Marking of connectors 2X5 to 2X12 

(9) 

Pressure transducer: pin configuration  

(10) 

Temperature sensor, element 1 

(11) 

Temperature sensor, element 2 

(12) 

Temperature sensor, element 3 

(13) 

Temperature sensor, element 4 

(14) 

Temperature sensor, LAT dryer 

(15) 

Pressure transducer, delivery air 

(16) 

Temperature switch, delivery air 

(17) FF 

only 

(18) Emergency 

stop 

(19) 

Remote start/ pr. Stop 

(20) 

Overload motor M1 

(21) 

Overload motor M2 

(22) 

Overload motor M3 

(23) 

Overload motor M4 

(24)  

Fault EWD 

(25) 

High temperature outlet 

(26)  

Remote pressure set point 
Selection: Open = set 1   Closed = set 2 

(27) 

Remote emergency stop 

(28) Auxiliary 

contacts