ABB ACS6080 - Voltage limiter unit (VLU)

POWER ELECTRONICS AND CABINET FEATURES
PRODUCT
ACS6000
DOCUMENT KIND
User manual
DOCUMENT ID.
3BHS212794 E01
REV.
N
LANG.
en
PAGE
63/266
3.3.3. Voltage limiter unit (VLU)
The VLU is used for applications that require dynamic changes between driving and
braking mode.
During braking, the energy is dissipated in liquid-cooled resistors. The resistors
are controlled by IGCT semiconductors and protected against overload.
Figure 3-22 VLU cabinet (A) and circuit diagram (B)
1) Air-cooled resistors 2) IGCT
DC (+)
DC (NP)
DC (-)
A
B
1
2