ABB ACS2000 DFE, User Manual

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2-12 (28) 2UEA001270 Rev. F ACS2000 User manual
Chapter 2 - Power electronics and cabinet features
2.2.5 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 topology, the drive produces
nine switching levels, phase to phase. The resulting waveforms permit the
application of standard induction motors.
Figure 2-10 INU - INverter Unit multi-level topology and waveform
The INU is composed of three identical phase modules (see section
2.2.3.1 Phase module). The phase modules can be removed from the
cabinet for maintenance and service.
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5
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Am
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Voltage
Current
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Phase voltage and current
Time