ABB ACS2000 User Manual page 24

24 A C S 2 0 0 0 , 4 K V U S E R M A N U A L
—
IFU - Input Filter Unit
17
Refer to Figure 17. The IFU is located between
IFU input filter
the source and the AFE. The IFU is a tuned filter:
—
inductors (1), resistors (2), and capacitors (3)
18
Energy flow in
that reduce harmonic disturbances injected
ACS2000 AFE Drive
to the supply network.
L1
L2
L3
—
17
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.
Utility
—
18
1
IFU
3 2
Customer
IFU AFE
1 Inductors
2 Resistors
3 Capacitors
AFE
DC +
NP
DC -
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.
Energy flow in driving mode
Energy flow in braking mode
(Regenerative operation only)
DC link INU
DC link
To INU
To NP
dV/dt filter