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Thread: Stall on a centrifugal fan
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30-05-2014, 09:51 AM #1
Stall on a centrifugal fan
Hi
I have a fan on a large AHU that is shuttering at approx 60% speed, has anyone ever experienced 'stall' on centrifugal fans? Both pulleys new, belts new and definantly aligned.
Anyone input would be appreciated!
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30-05-2014, 10:25 AM #2
Re: Stall on a centrifugal fan
So bunda,
Do you mean it vibrating like it's out of balance?
Can only suggest you check fan blades intact, clean & not damaged.
Check drive shaft is running true, as well as fan wheel.
All supports & structure of it secure.
Could also require balancing.
If you speed it up past 60% does it come good?Last edited by RANGER1; 30-05-2014 at 10:36 AM.
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30-05-2014, 12:00 PM #3
Re: Stall on a centrifugal fan
So running on a variable speed drive, up to 30hz fan runs perfect, between 32-35hz I have this issue then as it runs higher it corrects itself again.
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30-05-2014, 10:38 PM #4
Re: Stall on a centrifugal fan
Is it the fan, the motor or the inverter that is causing the problem?
Brian - Newton Abbot, Devon, UK
Retired March 2015
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30-05-2014, 10:49 PM #5
Re: Stall on a centrifugal fan
maybe slow down the ramp up time- check the inverter is prog correctly for the motor size,rpm,flc etc- run it in hand at 50htz to test it
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31-05-2014, 12:35 AM #6
Re: Stall on a centrifugal fan
http://www.pump-zone.com/topics/moto...-and-solutions
Suggest skip the frequencies causing the issues.Last edited by RANGER1; 31-05-2014 at 12:41 AM.
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31-05-2014, 12:54 AM #7
Re: Stall on a centrifugal fan
A large backward curve centrifugal will stall overload if discharge air is blocked or restricted.
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04-06-2014, 09:31 PM #8
Re: Stall on a centrifugal fan
Had an issue like this on a trane unit, new inverter sorted it