Nidec Leroy-Somer Powerdrive MD Smart, Руководство по интеграции

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56
HARDWARE SELECTION
Powerdrive MD Smart Integration Guide
5751 en - 2021.10 / e
HARDW
ARE
SELECTION
2.7.2.2 - Filtering options
Basic diagram of filtering required by active rectifier.
RFI Filter
UR
fuse
Regen
input reactor
Active rectifier
MD3INV
Fuses
Capacitors
Sine
filter
Main
contactor
RFI Filter
UR
fuse
Regen
input reactor
Active
rectifier
Fuse
Capacitor
Sine
filter
Main
contactor
Fuse
Preload
contactor
Inverter
MD3PRG
PRELOAD CIRCUIT
1
2 4
5 6 3
These options can be used with an MD3INV active rectifier. It is therefore necessary to know their characteristics so that they can
be supplied by the variable speed drive integrator from the supplier of his choice.
However, these options can be ordered at Leroy-Somer. In this case, refer to the Appendices to this document.
• RFI filter
The use of RFI filters helps to reduce the level of emission of radiated and conducted radio frequency signals. They enable MD3INV
components to comply with the EN61800-3 standard on variable speed drives. The Powerdrive MD Smart rectifiers have been
tested with Schaffner filters. The following tables show the compliance levels achieved and the types of filters used.
EN 61800-3
Variable speed drive
standards
Conforms to first and second environment IEC 61800-3
EN 61000-3
Issue
Standard Description Category
Basic compliance
requirements With optional RFI filter
EN 61800-3
Variable speed drive
standards
C1 - -
C2 -
Complies
- cable length <10 m
- chopping frequency <4 KHz
C3
Complies
- cable length <100 m
- chopping frequency <4 kHz
Complies
- cable length <100 m
- switching frequency <6 KHz
Main contactor
The line contactor is a necessary device to ensure the connection / disconnection of the power system’s active rectifiers. It is also
used for the implementation of the "EMERGENCY STOP" safety function, which is used to electrically and automatically isolate the
active rectifier from the power supply network.
It is a switching device only, it does not provide any protection function during a short circuit or a line surge
It is therefore the responsibility of the integrator to ensure this protection by adding equipment for this function (circuit breaker,
switch-splitter-fuse, etc.).
The line connector performs the switching and protection role.
In general, the line current and the breaking capacity are the main criteria for choosing a contactor. In addition, the rated current of
the contactor shall be greater than or equal to the rated input current of the active rectifier chassis.
The contactors to be used are of category AC-1 (resistive switching) which have a maximum breaking capacity equal to
approximately 1.5 times their rated load.
When shutting down the converter or tripping (default), the sequence to follow is:
• Locking the STO inputs of the active rectifier control module to lock the power stages (IGBT)
• Opening of the line contactor for electrical insulation of the power supply system.
See section
§4.5.1 for the power and control cabling diagram.