13
GENERAL INFORMATION
Powerdrive MD Smart Integration Guide
5751 en - 2021.10 / e
GENERAL
INFORMA
TION
Different drive configurations make it possible to respond to this problem of reinjection of harmonics into the network. Indeed,
depending on the choice of the drive architecture and/or adding filters (active or passive), the level of harmonics is reduced. The
choice of configuration is related to the required harmonic distortion rate (THD, rate expressed in percentage). The higher the rate,
the more the power supply network can be disrupted.
Current THD (%)
Drive configurations
Estimated current waveforms
30
6 PULSE
1 passive rectifier only: this is the configuration of a
commonly used standard variable speed drive
12
12 PULSE
2 passive rectifiers:
the rectifiers are powered by a 3-winding transformer
or by 2 transformers with 2 windings. The secondary
transformers are out of phase by 30° in both cases.
8
18 PULSE
3 passive rectifiers: the secondary transformers are
20° out of phase.
5
24 PULSE
4 passive rectifiers: the secondary transformers are
15° out of phase.
5
6 PULSE + ACTIVE LOW HARMONIC FILTER
1 passive rectifier only: corresponds to the
configuration of a commonly used standard variable
speed drive + 1 ACTIVE HARMONIC LOW FILTER
Summary of Contents for Leroy-Somer Powerdrive MD Smart
Page 1: ...Powerdrive MD Smart MD3 IP00 Chassis serie Integration Guide Reference 5751 en 2021 10 e...
Page 162: ...162 APPENDICES Powerdrive MD Smart Integration Guide 5751 en 2021 10 e APPENDICES Size 31...
Page 164: ...164 APPENDICES Powerdrive MD Smart Integration Guide 5751 en 2021 10 e APPENDICES RFI filter...
Page 172: ...172 APPENDICES Powerdrive MD Smart Integration Guide 5751 en 2021 10 e APPENDICES SEL990NT006...
Page 173: ...173 APPENDICES Powerdrive MD Smart Integration Guide 5751 en 2021 10 e APPENDICES Capablock...
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