ABB ACS1000i air-cooled, User Manual, Page: 51 / 174

03 POWER ELECTRONICS AND CABINET FEATURES
3BHS206977 E01 REV H ACS1000I AIR-COOLED USER MANUAL 51/174
3.4.12.3 External cooling for braking resistors
A digital output and a digital input can be used to control and monitor an external cooling fan
or pump for the braking resistors.
3.4.12.4 Braking chopper ratings
The maximum braking power is limited to 60% of the nominal power of the ACS1000 and must
not be greater than 2.5 MW (Tab. 2-1).
The relation between maximum braking energy (E
brake max
) and maximum chopper braking
power (P
chopper max
) is as follows:
After a braking period of 30 s with maximum braking power (2.5 MW), a cooling time of one
hour is required. If two braking sequences of 30 s are necessary within an hour, the maximum
braking power has to be reduced to 50% of the maximum possible braking power.
Table 3-1: Braking ratings
ACS1000 Braking chopper
Type
Max. DC-link
voltage (V)
Max. braking power
(MW)
Max. braking
power (MW)
Max. braking
energy (MW)
ACS1012-A1
ACS 1013-A1
ACS 1014-A1
4200
6000
7270
0.426
0.426
0.426
2500 75
ACS1012-A2
ACS 1013-A2
ACS 1014-A2
4200
6000
7270
0.672
0.672
0.840
2500 75
ACS1012-A3
ACS 1013-A3
ACS 1014-A3
4200
6000
7270
0.960
1.080
0.960
2500 75
ACS1012-W1
ACS 1013-W1
ACS 1014-W1
4200
6000
7270
1.350
1.500
1.350
2500 75
ACS1012-W2
ACS 1013-W2
ACS 1014-W2
4200
6000
7270
1.680
2.130
2.130
2500 75
ACS 1013-W3
ACS 1014-W3
6000
7270
2.500
2.500
2500 75
E
brake max
MWs
 
P
chopper max  
MW
 
30 sec

=