ABB ACS1000 User Manual page 43

3.4.9.3 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.
3.4.9.4 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
power (P
chopper max

E MWs
brake max
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
Type
ACS1012-A1
ACS 1013-A1
ACS 1014-A1
ACS1012-A2
ACS 1013-A2
ACS 1014-A2
ACS1012-A3
ACS 1013-A3
ACS 1014-A3
ACS1012-W1
ACS 1013-W1
ACS 1014-W1
ACS1012-W2
ACS 1013-W2
ACS 1014-W2
ACS 1013-W3
ACS 1014-W3
3BHS213401 E01 REV H
) is as follows:
   30 sec 
P MW
=
 
chopper max
ACS1000
Max. DC-link
voltage (V)
4200
6000
7270
4200
6000
7270
4200
6000
7270
4200
6000
7270
4200
6000
7270
6000
7270
ACS1000 AIR-COOLED USER MANUAL
03 POWER ELECTRONICS AND CABINET FEATURES
) and maximum chopper braking
brake max
Max. braking power Max. braking
(MW) power (MW)
0.426
0.426
0.426
0.672
0.672
0.840
0.960
1.080
0.960
1.350
1.500
1.350
1.680
2.130
2.130
2.500
2.500
Braking chopper
Max. braking
energy (MW)
2500 75
2500 75
2500 75
2500 75
2500 75
2500 75
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