03 POWER ELECTRONICS AND CABINET FEATURES
3BHS212794 E01 REV M ACS6000 USER MANUAL 74/278
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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