Delta CFP2000 Series User Manual page 21

Chapter 1 IntroductionCFP2000
Asymmetric Ground System (Corner Grounded TN Systems)
Caution:
Do not remove the RFI jumper while the input terminal of the Power Regenerative Unit carries power.
In the following four situations, the RFI jumper must be removed. This is to prevent the system from
grounding through the RFI capacitor and damaging the Power Regenerative Unit.
1. Grounding at a corner in a triangle configuration
Figure 1-11
3. No stable neutral grounding in a three-phase autotransformer configuration
Internal grounding through RFI capacitors, 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.
RFI jumper must be removed
2. Grounding at a midpoint in a polygonal
configuration
L 1
L 2
L 3
Figure 1-13
RFI jumper can be used
1-12
L 1
L 2
L 3
Figure 1-12
Figure 1-14
L 1
L 2
L 3