ABB ACS2000 - IFU - Input Filter Unit; AFE - Active Front End

ACS2000 User manual 2UEA001270 Rev. F 2-5 (28)
Chapter 2 - Power electronics and cabinet features
2.2.2 IFU - Input Filter Unit
Refer to Figure 2-3. The IFU is located between the source and the AFE.
The IFU is a tuned filter: inductors (1), resistors (2), and capacitors (3) that
reduce harmonic disturbances injected to the supply network.
Figure 2-3 IFU input filter
2.2.3 AFE - Active Front End
The front end of the drive consists of an active rectifier for regenerative
operation. The AFE features the same electrical design as the INU
(INverter Unit) of the drive.
The AFE rectifies the AC line voltage of the supply network and connects
its output to the DC link.
The AFE maintains the DC link voltage at the required level and provides
unity power factor at the input terminals of the drive.
To NP
NP
DC linkAFEIFU
L3
L2
To INU
DC+
L1
DC-
Legend
1 Inductors
2Resistors
3 Capacitors
1
2
3
1
Utility
Energy flow in braking mode
(Regenerative operation only)
dV/dt filterINUDC linkAFEIFU
M
Customer
Energy flow in driving mode