What power does fan draw at vin's other than nominal?

[cupoftea]

Hi,
The Papst, 624HH fan,

We intend to run it with 30V input (even though its quoted for 18-28V)

Papst 624HH fan

https://www.farnell.com/datasheets/2762392.pdf

What power will it draw when its Vin is 30V? Will it spin faster at 30V than the nominal 24V?
Will its lifetime be reduced?

 

[barry]

Why don't you ask the manufacturer??????

 

[KlausST]

Hi,

I doubt they will give any information for operation beyond specified voltage range.

And I can only recommend not to operate them outside specification.
Dropping 2V should not be a big problem.

Klaus

 

[dick_freebird]

Well, you can't figure incremental torque (hence current)
without some idea whether airflow is and will remain
laminar (drag proportional to speed), or is / will go
turbulent (square law or higher order). The bare minimum
would be an extrapolation of the available load vs line
data, to the max planned fan supply.

Why not buy one, try one, read and record? Then test to
fail at 10% higher than plan max over the weekend, the
week, then start ramping more until the smoke comes out.
You still know nothing about production consistency but
you might get out of school early if it breaks easy.

 

[cupoftea]

Thanks, it says 28V is its max.....if we ran it at 28V, woudl it draw the same power as at 24V?....or does dick_freebird's kind answer also apply to that? (drag etc)

Why don't you ask the manufacturer??????

Our volumes are too small

 

[barry]

Thanks, it says 28V is its max.....if we ran it at 28V, woudl it draw the same power as at 24V?....or does dick_freebird's kind answer also apply to that? (drag etc)


Our volumes are too small

Nonsense.

if you worked for me and that was your reason for not doing your job, you wouldn’t work for me much longer.

 

[FvM]

To answer the question yourself, connect any available DC fan to a lab supply and observe speed and current consumption versus voltage.

 

[FvM]

Some hints in this white paper from nbm: https://nmbtc.com/wp-content/uploads/2019/04/nmbtc-whitepaper-dcbrushlessfanbehavior.pdf

 

[cupoftea]

Why don't you ask the manufacturer??????

Thanks, i have contacted them now. Hopefully they will tell, but they have a lot of Apps info on their website and nothing about power consumption vs voltage input.

I would hazard a guess that power consumption goes up at least linearly with voltage for the 624HH. As to operating at 30V for an 18-28V fan, i have a funny feeling they are going to just blank this one, unfortunately.

 

[FvM]

As a first order estimation, consider speed and current to rise linear with supply voltage and power consumption squared.