Optional Cabinet Units; Input Reactor Unit (Iru) - ABB ACS6080 User Manual

3.3

Optional cabinet units

The following sections describe the IRU, IFU, VLU, BCU, RBU and EXU
optional cabinet units.
3.3.1

Input reactor unit (IRU)

The IRU is used with the 6-pulse LSU for applications without an
input transformer. The IRU limits the input current and improves the total
harmonic distortion (THD) of the supply voltage.
1
1L1
1L2
1L3
(1) IRU
(2) LSU
(3) Thyristor crowbar
(1) Three-phase reactor
3BHS842007 E01 REV C
2
3
Figure 3-16 IRU circuit diagram
1
Figure 3-17 IRU cabinet
ACS6080 USER MANUAL
03 POWER ELECTRONICS AND CABINET FEATURES
4 5
(4) Diode rectifier
(5) Snubber circuit
(6) di/dt choke
1 1
DC (+)
6
6
DC (-)
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