ABB ACS1000i air-cooled, User Manual, Page: 47 / 174

03 POWER ELECTRONICS AND CABINET FEATURES
3BHS206977 E01 REV H ACS1000I AIR-COOLED USER MANUAL 47/174
3.4.11.4 Starting, stopping the cooling system
The drive switches on the cooling system when the main circuit breaker (MCB) closes. When the
MCB opens, the cooling system switches off after a delay. The delay corresponds to the
discharging time of the drive and takes up to 5 minutes.
3.4.11.5 AC redundant fans - operating principles
Default settings:
- Cycle time during which AC fan 1 and AC fan 2 run alternately: 10 h
- Operating time of AC fan 1: 6 h
- Operating time of AC fan 2: 4 h
Figure 3-17: Operating times of the AC fan units during continuous drive operation (
A
) and
Intermittent drive operation ( B )
(1) Cycle time
(2) Group 1
(3) Group 2
(4) 10 hours: default cycle time during which fan 1
and fan 2 run alternately
(5) 6 hours: default operating time of fan 1 (group 1)
(6) 4 hours: default operating time of fan 2 (group 2)
(7) On
(8) Off
1
2
3
4 4
5 5
6
A B
7
8
7
8