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 link
AFE
IFU
L3
L2
To INU
DC+
L1
DC-
Legend
1
Inductors
2
Resistors
3
Capacitors
Utility
Energy flow in braking mode
(Regenerative operation only)
dV/dt filter
INU
DC link
AFE
IFU
M
Customer
Energy flow in driving mode
Содержание ACS2000 DFE
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