POWER ELECTRONICS AND CABINET FEATURES
PRODUCT
ACS6000
DOCUMENT KIND
User manual
DOCUMENT ID.
3BHS212794 E01
REV.
N
LANG.
en
PAGE
44/266
3.2. Standard cabinet units
The following sections describe the ARU, INU, LSU, CBU, TEU, COU and WCU
cabinets.
3.2.1. Active rectifier unit (ARU)/inverter unit (INU)
An ARU and INU have the same mechanical and electrical designs.
– ARU: a 6-pulse self-commutated voltage source inverter that rectifies the line
voltage of the supply network and maintains the DC-link voltage at a constant
level irrespective of changes in the supply network.
The active 6-pulse rectifier allows for regenerative braking.
– INU: controls the 3-phase motor voltage and converts the DC-link voltage to the
required AC motor voltage and frequency.
The INU is a self-commutated voltage source inverter in 6-pulse, 3-level
topology. To increase the drive power, 4 units can be operated in parallel on 1
motor.
Figure 3-3 ARU/INU block diagram
Figure 3-4 ARU/INU circuit diagram
1) ARU
2) DC-link
3) INU
4) Motor
1) Clamping circuit
2) Phase modules
3) EMC filter
1
2 3
4
DC (+)
DC (NP)
DC (-)
L1
L2
L3
1
2 3
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