03 POWER ELECTRONICS AND CABINET FEATURES
3BHS213401 E01 REV H ACS1000 AIR-COOLED USER MANUAL 44/184
3.5.5 EC redundant fans – operating principles
When no EC fan failure exists, all EC fans are turned on and are running at a lower speed
(typically the minimum speed). When one EC fan fails, the second EC fan will speed up to ensure
the required cooling.
Figure 3-14: Operating principles of redundant EC fans
Both fans are running
Fan 1 fails, fan 2 increases speed
Fan 1 is stopped, Fan 2 is running at nominal speed
Fan 1 resumes operation, fan 2 decreases speed
(1) Fan 1
(2) Fan 2
(3) Drive load
(4) Nominal fan speed
(5) Reduced fan speed
(6) Minimum fan speed
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