ABB ACS2000 AFE 1MVA - Page 35

35 ACS2000 AFE 1MVA UM 3BHS297030 ZAB E01 REV. J
2.3.1 IFU - Input filter unit
The IFU (2-3: 1) is located between the input trans-
former and the AFE. The IFU is a tuned filter that
reduces harmonic voltages injected to the supply
network.
2.3.2 DTL compartment
The DTL compartment (2-3: 2) is present in drives
configured for direct-to-line connection. The func-
tions of the compartment are twofold:
• It smooths the current harmonics in the power
supply.
• It decouples the common mode voltages of the
drive from the network.
—
References
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2-4 IFU - Input filter unit
—
2-4
AFE DC link
DC+
NP
DC-
U1
V1
W1
to NP
IFU
to INU