POWER ELECTRONICS AND CABINET FEATURES
PRODUCT
ACS6000
DOCUMENT KIND
User manual
DOCUMENT ID.
3BHS212794 E01
REV.
N
LANG.
en
PAGE
64/266
3.3.4. Braking units
A braking chopper unit (BCU) and a resistor braking unit (RBU) are available for the
ACS6000.
These braking units are used for applications that require fast braking where
regenerative braking is not allowed, eg, marine applications; therefore these units
are typically part of a drive that contains an LSU. The BCU and RBU enable such
drives to perform effective motor braking.
However, BCUs and RBUs can also be used in combination with ARUs, eg, mine
hoists and other special applications that require emergency braking in the event
of a power outage.
During braking, the BCU limits the DC-link voltage and converts the braking energy
into heat that is dissipated in resistors. IGCT semiconductors switch the braking
energy to the resistors.
Table 3-5 BCU braking power
Braking resistor (ohm) Single braking power (kW) Double braking power (kW)
RBU 800 1600
10 1100 2200
8 1400 2800
7 1600 2800
6 1900 3200
5 2200 3700
4 2800 4500
3.6 3100 5600
Table 3-6 RBU braking power
Single braking power (kW) Double braking power (kW)
800 1600
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