The AQS pizza box style (if I’m thinking of the right one) fan design
seems incredibly inefficient to me. Trying to pull air up and compress to
immediately try and shunt it 90° to a narrow exit seems just asking too
much right off the bat. The fans are certainly easier to access for replacement
….but they’ve got to do a ton of work for little relative air
movement.
Shouldn’t there be a better way to regulate?
Best wishes,
Ryan
Ps
One of the most efficient, quiet, and reliable cooling I’ve ever seen
was the old Apple G4 towers with internal horizontal isolated compartments and
separate large intake and exhaust fans.
The system would monitor each level and adjust fans individually, running almost
silently with very efficient temperature control.
----------------------------------------------------------
Ryan McKay, PhD
NMR Facility Manager
(he/him)
University of Alberta
College of Natural and Applied Sciences - Faculty of Science
Department of Chemistry
Shipping Address
Co: Ryan McKay Room E3-17A East Chem. Bld.
Central Receiving
University of Alberta
116 Street and 85th Avenue
Edmonton, Alberta, Canada
T6G 2R3
Office 780.492.9950
Mobile 780.920.8871
URL uab.ca/nmr
Email ryan.mckay_at_ualberta.ca

The University of Alberta respectfully acknowledges that we are situated on
Treaty 6 territory, traditional lands of First Nations and Métis people.
> On Oct 20, 2023, at 9:40 AM, Igor Moudrakovski <i.moudrakovski_at_fkf.mpg.de> wrote:
>
> Hi Simon,
>
> I had exactly that issue a few month ago. In my case it was caused by poor
> cooling of the AQS rack due to a couple of failed fans. I changed all eight
> fans on the top of the rack, and the issue has gone.
>
> The total cost of repair was about 300 €.
>
> Cheers,
>
> Igor
>
> -- Igor Moudrakovski,
> PhD Max-Planck Institute for Solid State Research
> Heisenbergstr. 1, 70569 Stuttgart, Germany
>
>
>
> On 20/10/2023 16:29, Sham, Shing wrote:
>> Hi,
>> I have had an intermittent issue from AQS3+, it has happened few times in last 2 months.
>> 1. When Topspin tried to wobb or atma(n), it failed.
>> 2. It complained about a power failure in AQS. See pict. #1
>> 3. Then it showed a closed connection between remote host (PC) and spectrometer (?). See pict. #2
>> 4. All the components in AQS web service became "unknown". See pict. #3
>>
>> First time when it happened, I reset the IPSO. It got back to normal,
>> Finally, I just clicked on the "confirm" shown in pict.#3 and all the components
>> changed back to "OK" instantaneously. It seemed to me it meant "Yeah, I know there
>> is a problem on a power supply! I will fix it"
>>
>> My questions: Is "SLOT 1 RACK 1: Power failed" referred to the PSM-48V ac/dc power
>> supply in slot 1?. When it happened, the status LEDs on SGUs and others were OK.
>>
>> Has anyone seen this problem before?
>>
>> Thanks for your insight in advance.
>>
>> Simon
>
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Received on Fri Oct 20 2023 - 10:15:45 MST