CHAPTER 2 – POWER ELECTRONICS AND CABINET FEATURES 40
2.3.5 INU - Inverter unit
The INU converts the DC voltage to the required AC
motor voltage and frequency.
Like the AFE, the INU is an active 3-phase unit with
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.
The resulting waveforms permits the application
of standard motors.
The INU is composed of three identical phase mod-
ules (see Phase module). The phase modules can
be extracted from the cabinet to facilitate mainte-
nance and service on the INU.
Phase module of phase U2
Phase module of phase V2
Phase module of phase W2
P
P
P
P
P
P
10000 V
5000 V
- 5000 V
- 10000 V
P
P
P
10000 V
5000 V
- 5000 V
- 10000 V
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