ABB ACS6080 - Optional cabinet units; Input reactor unit (IRU)

POWER ELECTRONICS AND CABINET FEATURES
PRODUCT
ACS6000
DOCUMENT KIND
User manual
DOCUMENT ID.
3BHS212794 E01
REV.
N
LANG.
en
PAGE
61/266
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.
Figure 3-20 IRU cabinet (A) and circuit diagram (B)
1) Three-phase reactor
2) IRU
3) LSU
4) Thyristor crowbar
5) Diode rectifier
6) Snubber circuit
7) di/dt choke
DC (+)
DC (-)
1L1
1L2
1L3
A
B
2 3
4
5
6
7
7
1 1 1