ABB ACS1000 - AC Redundant Fans - Operating Principles

03 POWER ELECTRONICS AND CABINET FEATURES
3BHS213401 E01 REV H ACS1000 AIR-COOLED USER MANUAL 43/184
3.5.4 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 3-13: Operating times of the AC fan units during continuous drive operation (A) and
Intermittent drive operation (B)
When the drive operates continuously, AC fan 1 switches off after six hours and fan 2 switches
on for four hours.
When the drive operates intermittently, the AC fan that is due for operation is switched on and
off in the same pattern as the drive until the programmed operating time has elapsed.
If one AC fan fails, the second AC fan switches on and runs continuously.
(1) Cycle time
(2) Fan 1
(3) Fan 2
(4) 10 hours
(5) 6 hours
(6) 4 hours
(7) On
(8) Off
1
2
3
44
5 5
6
AB
7
8
7
8