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Parallella Community Supercomputing for Everyone 2014-05-05T16:28:00+00:00 https://parallella.org/forums/feed.php?f=11&t=1156 2014-05-05T13:29:05+00:00 2014-05-05T13:29:05+00:00 https://parallella.org/forums/viewtopic.php?t=1156&p=7242#p7242 <![CDATA[Re: Another simple fan for the Adapteva case]]> As before, the appertures both sides of the fans have been blanked with clear tape.

Running them both off 12V gives a temperature of about 55C.
Running them both off 5V gives a temperature of about 65C. which is I think fine.
See the temperature graph using xtemp :

P1180740_2-fan_rot_cr_en_lo.jpg

So connecting the fan leads to the 5V jumper and an earthed mounting hole, the system looks like as follows
- and runs whisper quite off the 5V :

P1180742_cr_br_lo.jpg

A final thing one could so is use Arctic silver heatsink compound on the heasink which can reduce the temperature a few degrees further, see thread

Statistics: Posted by Dr.BeauWebber — Mon May 05, 2014 1:29 pm

]]> 2014-05-05T16:28:00+00:00 2014-05-04T19:15:28+00:00 https://parallella.org/forums/viewtopic.php?t=1156&p=7223#p7223 <![CDATA[Another simple fan for the Adapteva case]]> I like the tiny 5V fans that some people are using, but could not find one in my Canterbury Maplin.
However they did have a couple of different 40mm x 40mm fans, and I went for the (cheaper) slimline brushless one -see picture 1.
P1180726_fan-on-card_cr_en_lo.jpg

I have simply mounted it outside the case using super-glue (my home tool-box was over in my lab for the long-weekend), and so-far just covered the appertures each side with clear tape.
P1180733_Case_with_fan_lo.jpg
This is a 12V fan, and I am currently powering it from an old external USB drive supply. However it seems to run fine on 5V, almost silently, and after the weekend I will borrow a digital temperature monitor from my lab, and check the heatsink temperature running off 5V. If that is OK I will wire it into the case as per the 5V designs.

[Edited] :
Ah, of course, the FPGA has an on-chip temperature sensor. And in the Parallella example program directory there is an already compiled temperature grapher program : xtemp.

I ran this, first with 12V applied to the fan : ~59C
then with the fan stopped : the temperature rows rapidly to over 70C and was still going up rapidly,
then with 5V applied to the fan : the temperature stabilised around 69C,
and then with 12V applied again, when the temperature again dropped.
This is when basically idelling - a few windows open and xtemp running.

P1180736_xtermp_en_cr_lo.jpg

So the question is, is about 70C OK, running from 5V ?
Or should I go back to 12V ? I might see if a bigger heatsink helps.

Statistics: Posted by Dr.BeauWebber — Sun May 04, 2014 7:15 pm

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