25
·When the drive is connected to a large-capacity transformer, the current in the input power circuit of the drive
may damage the rectifying circuit. In general, when the power supply capacity of the drive is larger than
550kVA, or 10 times higher than the drive capacity, the drive needs to be configured with the DC reactor.
5. AC input reactor
An AC input reactor should be used if the distortion of the power grid is severe or the input current harmonic
level is high even after a DC reactor has been connected to the drive. It can also be used to improve the AC
input power factor of the drive.
6. AC output reactor
If the cable between drive and motor exceeds 80m, multi-stranded cables and an AC output reactor should be
used to suppress the high frequency harmonics. Thus, the motor insulation is protected against heat due to
harmonics, leakage current is reduced and the drive will not trip frequently.
7. Input EMI filter
Optional EMI filter may be installed to suppress the high-frequency noise interference from the drive power
cable.
8. Output EMI filter
Optional EMI filter may be installed to suppress the high-frequency noise interference and leakage current at
the drive output side.
9. Safe grounding wire
The drive has leakage current inside. To ensure the safety, the drive and motor must be grounded, and the
grounding resistance shall be less than 10Ω. The grounding wire shall be as short as possible and its cross
section area (CSA) should meet the requirements in Table 3-2.
Note: The values in the table apply only when the two conductors adopt the same metal. If not, the cross
section area of the protective conductor shall be determined according to the equivalent conducting factor.
Table 3-2 Cross section area of grounding wire
CSA of phase cable S (mm
2
) Min. CSA of grounding wire Sp (mm
2
)
S≤16 S
16＜S≤35
16
35＜S
S/2
Note
The input/output EMI filter shall be installed as close to the drive as possible.
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