Braking Units; Bcu Braking Power; Rbu Braking Power - ABB ACS6000 User Manual

3.3.4

Braking units

A braking chopper unit (BCU) and a resistor braking unit (RBU) are
available for the ACS6000.
Braking resistor (ohm)
Single braking power (kW)
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.
3BHS212794 E01 REV M
Table 3-5 BCU braking power
Single braking power
RBU
10
8
7
6
5
4
3.6
Table 3-6 RBU braking power
800
03 POWER ELECTRONICS AND CABINET FEATURES
(kW)
800
1100
1400
1600
1900
2200
2800
3100
Double braking power (kW)
ACS6000 USER MANUAL
Double braking power
(kW)
1600
2200
2800
2800
3200
3700
4500
5600
1600
74/278