This input is used to activate the load reserve set #3 instead of the set #1, which 
is active by default. The set #3 is adjusted by setpoints: 
  #LoadResStrt 3 and #LoadResStop 3 if the power management is 
switched to absolute (kW-based) mode  
  #%LdResStrt 3 and #%LdResStop 3 if the power management is 
switched to relative (%Pnom-based) mode.  
CAUTION!  
All controllers cooperating together in Power management must have the same 
load reserve set selected. 
 
NOTE:  
It is possible to use virtual peripheries for distribution of the binary signal from one 
physical switch connected to one controller to all other controllers over the CAN 
bus. See example in the description of the input Load res 2.