Operating Instructions

Introduction
RFI Jumper
12 | 443
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 prevents the system from grounding through
the RFI and filter capacitors and damaging the drive.
You must remove the RFI jumper for an asymmetric ground system.
1. Grounding at a corner in a triangle configuration
2. Grounding at a midpoint in a polygonal configuration
3. Grounding at one end in a single-phase configuration
4. No stable neutral grounding in a three-phase
autotransformer configuration
You can use the RFI jumper for a symmetrical grounding power system.
In a situation with a symmetrical grounding power system, you
may 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.