KEB COMBIVERT F5 Reference Manual page 38

2.8.1 Ferrite Ring Installation
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Use with regen units
Ferrite rings are required to limit common mode noise and minimize
electrical disturbances on the DC bus connections between the inverter
and regen unit(s). Ferrite rings are to be installed over the ++ and -- DC bus
connectors and should be installed as close to the inverter as possible. Do
not pass ground conductors through the ferrite rings. When multiple
regen units in parallel are used with a single inverter, the number of ferrite
rings on the DC bus to be installed should be the same as the number of
regen units.
Each KEB R6 regen unit is provided with a ferrite ring with the following part
number and dimension:
Part Number
00.90.390-K000
If the regen unit is not installed inside the same control cabinet as
i
the inverter, a second ferrite ring is required between the inverter and
regen to further limit common mode noise on the DC bus.
Overall Dimensions in mm (inches)
56 x 32 x 18 (2.2 x 1.3 x 0.7)