Voltage Limiter Unit (Vlu) - ABB ACS6080 User Manual

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.
(1) Air-cooled resistors
3BHS842007 E01 REV C
Figure 3-20 VLU circuit diagram
Figure 3-21 VLU cabinet
(2) IGCT
ACS6080 USER MANUAL
03 POWER ELECTRONICS AND CABINET FEATURES
DC (+)
DC (NP)
DC (-)
1
2
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