Re: Physical planning info for 9406-720... -- MIDRANGE-L

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That IS the internal cooling fans lighting off (to use the Turbineanalogy). Those babies start up at full speed (30v or so) until they allcheck in. Then they 'downshift' to maybe 16 to 18v and run lots quieterunless another fan fails or the system senses the need for 'enhancedairflow'. Not all the fans are the dual speed ones but the ones in thepower supply area are.

I have several of those fans and if you connect them to the full rated30v they don't even sound safe! Check out the pictures of the originalFrankie at www.frankenseries.com and that's what we have on the front ofthe 'external disk' units. In fact at COMMON in Indy, where those picswere taken' we had to rewire the fans from 24V down to 12V because theywere simply too noisy for the certification lab.


 - Larry

Haase, Justin C. wrote:

Anyone know what the noise is that the 620/720 systems make about 5
seconds after power-on?  Sounds like some sort of turbine inside of the

machine. It can't be the fans - can it??


--
Justin C. Haase - iSeries System Engineer

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