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
3BHS212794 E01 REV M
Figure 3-24 VLU circuit diagram
Figure 3-25 VLU cabinet
(2) IGCT
ACS6000 USER MANUAL
03 POWER ELECTRONICS AND CABINET FEATURES
DC (+)
DC (NP)
DC (-)
1
2
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