SUA2200XLI fan noise

NB-23 Member Warrington

Example question:

Hello
We have an SUA2200XLI mounted in our comms cabinet. I have noticed that it sometimes has a loud fan noise, and other times no noise. Is this normal or is the fan on its last legs? I've got the UPS out and the fan is spinning freely.

2_1688553510_2023-07-05 11.37.18 neonbbk

2_1688553510_2023-07-05 11.37.18 neonbbk

NB-23, 2023-07-05 11:38:56 +01:00

#2

NB-23 Member Warrington

Howdy!
the SUA2200xli is a dual speed fan
when its in low mode you can hardly hear it - only in a quiet room.
When the UPS hits one or more of the below criteria it switches to high speed
1/ Running from cell power
2/ Output power hits a certain threshold
3/ battery charger running at high current (IE recovering capacity ASAP after power failure)
4/ Internal temp is over a certain threshold (slightly variable across models, and even units of the same model).

I think this is the third option - the UPS is running as normal and eventually get to the threhshold - the fan runs high for a period, the UPS cools down a bit and then it goes back to normal, low speed running.

We had a customer who found this a nuisance, and they aded another fan over the front of the UPS that was continually blowing at a rate that was higher than the low speed fan, and quieter than the high speed. This resulted in no cycling of the fan speed- it only moved to high mode when running from cell power in the future.

NB-23, 2023-07-05 11:44:33 +01:00

#3