Application Notes 10-17
690+ Series AC Drive
withstanding 1000Vdc . Although HRC fuses would be adequate, the high DC voltage
requirement (1000Vdc) may limit the choice to semiconductor fuses.
EMC Filtering
We recommend all 690+ Regen systems meet the EMC product specific standard EN61800-
3:1997 . To achieve this, an EMC filter is required. Contact SSD Drives for details of suitable
filters.
Note: All drives in a common DC link scheme using a 4-Q Regen front-end must have their
internal "Y" caps to earth (PE) removed. Please contact SSD Drives.
2-Q Common DC Bus Applications
Using a common DC bus allows regenerative energy to be shared between the drives on the
system, improving efficiency.
Two Options are shown below. Both options are single-ended, i.e. no power is returned from the
control system to the mains. It is redistributed throughout the system, resulting in less drain from
the supply.
Note: The choice of option will depend upon the application and different quantities/powers of
inverters, to provide the greatest efficiency.
OPTION 1
Small numbers of drives can be coupled together on both the AC supply side and DC bus side.
>700V
AC Supply
DC-
DC+
AC
Drive
AC Motor
AC Line Chokes
DC Fuses
Common DC Bus
DC-
DC+
AC
Drive
AC Motor
DC-
DC+
AC
Drive
AC Motor
AC Fuses
Contactor
Considerations
x AC fuses should be fast-acting. Ideally, add fuse monitoring to shut down the total system
in the event of any AC fuse failure.
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