Chapter 1 Introduction MS300 (High Speed Model) Asymmetric Ground System (Corner Grounded TN Systems) Caution: Do not remove the RFI jumper while the input terminal of the drive carries power. In the following four situations, the RFI jumper must be removed. This is to prevent the system from grounding through the RFI and filter capacitors, damaging the drive. 1-6 RFI jumper must be removed 1. Grounding at a corner in a triangle configuration L1 L2 L3 2. Grounding at a midpoint in a polygonal configuration L1 L2 L3 3. Grounding at one end in a single-phase configuration L1 N 4.
No stable neutral grounding in a three-phase autotransformer configuration L1 L1 L2 L2 L3 L3 RFI jumper can be used Internal grounding through RFI capacitors, which reduce L1 electromagnetic radiation. In a symmetrically grounding power system with higher EMC requirements, an EMC filter can be installed. As a reference, the diagram on the right is a symmetrical grounding power system. L2 L3