Atlas Copco Stationary Air Compressors User Manual

Instruction book 

2920 1521 00 

11 

 

 
SF Multi are provided with an Elektronikon® regulator (Fig. 1.11) to control the compressor. 
 
The following is a short description of the main functions of the regulator.  Consult section 8 for a 
detailed description of all functions. 
 

 
The Elektronikon regulator keeps the net pressure within programmable limits by starting and stopping 
the compressor modules, depending on the air consumption.  The regulator distributes the running 
time among the compressor modules, taking into account the availability and number of running hours 
of each compressor module.   
 
When the compressor has stopped automatically and the net pressure decreases, the regulator will 
start a compressor module before the net pressure has dropped to the starting pressure to prevent the 
net pressure from falling under the programmed minimum level. 
 

 
If one or more compressor modules are shut down due to a protection function a warning message will 
be shown on the display. 
 
The compressor will be shut down in case temperature switch (TSHH20-Fig. 2.8) trips.  See also 
section 8.3.2. 
 
Warning 
Before carrying out any inspection or repair, stop the compressor, switch off the voltage, open the 
isolating switch and depressurize the compressor.   
 
After remedying, switch on the voltage and press the key “Reset” (F3). 
 

 
A number of service operations are grouped in plans (called Service plans I, A, B and D).  Each 
Service plan has a programmed time interval.  If a time interval is exceeded, a message will appear on 
the display to warn the operator to carry out the service actions belonging to that plan.  
 

 
The regulator has a built-in function to automatically restart the compressor if the voltage is restored 
after voltage failure.  For compressors leaving the factory, this function is made inactive.  If desired, 
the function can be activated.  Consult Atlas Copco.