POWER ELECTRONICS AND CABINET FEATURES
PRODUCT
ACS6000
DOCUMENT KIND
User manual
DOCUMENT ID.
3BHS212794 E01
REV.
N
LANG.
en
PAGE
48/266
3.2.3. Capacitor bank unit (CBU)
The capacitor bank unit (CBU) smooths the DC-link voltage and decouples the
rectifier from the inverter. A CBU consists of DC-link capacitors, a charging unit
and a grounding switch.
The width of the unit (800 mm or 1000 mm) depends of the number of capacitors
that are required.
The CBU is based on a modular design and the amount of DC-link capacitors in the
CBU depends on the converter power rating.
Figure 3-9 CBU
Table 3-3 Main components in a CBU cabinet
Component Description
Liquid-cooled DC-link
capacitors
Charging unit To avoid excessive inrush currents after the main circuit breaker
has been closed, the capacitors are charged before the drive is
connected to the main power source.
Discharging unit This optional unit discharges the DC-link capacitors if the drive
is not equipped with a voltage limiter unit, resistor braking unit
or braking chopper unit.
Grounding switch The grounding switch is a safety switch to ground the DC bus of
the drive. These can only be closed if the DC-link capacitors have
been discharged. For more information, see “8.5 EXU control
panel” on page 166.
1) Grounding switch 2) DC-link capacitor
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