Chapter 1 IntroductionC2000 Series 
 
1-6
3 Grounding at one end in a single-phase 
configuration  
L
N
 
4 No stable neutral grounding in a three-phase 
autotransformer configuration   
L
L2
L3
L1
L2
L3
 
RFI jumper can be used   
Internal grounding through RFI capacitor, which reduces 
electromagnetic radiation. In a situation with higher 
requirements for electromagnetic compatibility, and using a 
symmetrical grounding power system, an EMC filter can be 
installed. As a reference, the diagram on the right is a 
symmetrical grounding power system.   
L2
L3
L