Inu - Inverter Unit; Emc Filter - ABB ACS2000 AFE 1MVA User Manual

41 ACS2000 AFE 1MVA UM 3BHS297030 ZAB E01 REV. J

2.3.5 INU - Inverter unit

—
References
The INU converts the DC voltage to the required AC
—
motor voltage and frequency.
2-11 INU - Inverter unit
—
Like the AFE, the INU is an active 3-phase unit with

2-12 EMC filter

the same electrical configuration. The unit is
designed as a self-commutated, 5-level voltage
source inverter. As a result of the multi-level topol-
ogy, the drive produces an optimum number of
switching levels - nine levels, phase to phase.
10000 V
10000 V
5000 V
5000 V

- 5000 V
- 5000 V
- 10000 V
- 10000 V
The resulting waveforms permit the application of
standard motors.
The INU is composed of three identical phase mod-
ules (see
be extracted from the cabinet to facilitate mainte-
nance and service on the INU.
Phase module of phase U2
1
Phase module of phase V2
2
Phase module of phase W2
3
—
2-11

P

P P

P P

P P



Phase module). The phase modules can
1
2
3
2.3.6 EMC filter
The INU includes a three-phase du/dt filter con-
nected to its AC output. The filter chokes
resistors
the motor against excessive voltage slopes (du/dt
is limited to 500 V/?s).
Time
P

P
DC link
DC+
NP
DC-
to NP
—
2-12
(2-10: 2), and capacitors (2-10: 3)
INU EMC filter
1
(2-12: 1),
protect
U2
V2
W2
2
3