Chapter 1 Introduction MS300 (IP66 / NEMA 4X)
1-10
Do not install an external EMC filter. The EMC filter is connected to ground through the filter
capacitors, and connects the power input to ground. This is very dangerous and can easily damage
the drive.
Asymmetric Ground System (Corner Grounded TN Systems)
Caution: Do not remove the RFI jumper while there is power to the input terminal of the drive.
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.
You must remove the RFI jumper
1. Grounding at a corner in a triangle configuration
L2
L3
L1
2. Grounding at a midpoint in a polygonal
configuration
L2
L3
L1
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
You can use the RFI jumper
Internal grounding through RFI capacitors that reduce
electromagnetic radiation. In a symmetrically grounding
power system with higher EMC requirements, install an
EMC filter. As a reference, Figure 1-19 is a symmetrical
grounding power system.
L2
L3
L
Figure 1-15
Figure 1-16
Figure 1-17
Figure 1-18
Figure 1-19
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