Chapter 1 Introduction MS300 Asymmetric Ground System (Corner Grounded TN Systems) Caution: Do not remove the RFI jumper while power to the input terminal of the drive is ON. In the following four situations, you must remove the RFI jumper. This is to prevent the system from grounding through the RFI and filter capacitors and damaging the drive. 1-7 You must remove the RFI jumper for an asymmetric ground system 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 You can use the RFI jumper for a symmetrical grounding power system In a situation with a symmetrical grounding power system, you can use the RFI jumper to maintain the effect of the built-in EMC filter and surge absorber. For example, the diagram on the right is a symmetrical grounding power system. L1 L2 L3