Service Action to Prevent PSU Failures in ReadyNAS NV/NV+

muri wrote:
I'd like people form Infrant tech to suggest some fan models (if there is any) that could lower the noise without lowering the cfm.

I've asked this before in another thread but got no reply. I am not keen on the quality of the supplied fan; the original had that clicking noise. I replaced it with the official one from the Infrant shop and that was worse! The third one was slightly better so the quality does vary. I'd like to replace it with a good quality one by a different manufacturer (and the same now applies to the PSU!)

I own a ReadyNAS NV that is not affected by the power supply issue. However, when I first received my unit a year and a half ago, I actually did play with fan reversal just to see if I could improve temps or airflow.

What I found is that reversing the fan actually made the unit HOTTER by 2-4 degrees C. This was odd to me, since the reversed fan would be acting as an intake, and blowing fresh cool air directly onto the drives.

Turns out that the limiting factor in fan reversal, is the ability to then get that air OUT of the box. I think the front mesh grille makes it hard for this to happen. After that little experiment, I turned the fan back around into its stock position. That worked best for me, but then again, I don't have the PS issue being discussed here.

muri wrote:
I'd like people form Infrant tech to suggest some fan models (if there is any) that could lower the noise without lowering the cfm.

In general, this is hard to accomplish, since for a given fan size, CFM is related to fan speed. And fan speed is related to fan noise. Now the quality of that noise may differ (high-pitched being more annoying than low-pitch).

For a good reference of quieter fans, take a look at:
http://www.silentpcreview.com/section5.html

You may also want to check out the Listening Room at:
http://www.sidewindercomputers.com/tecar.html

The first link looks at recommended quiet fans, whereas the second has actual MP3 files of various fans under "standardized" conditions to allow for user comparison.

Hope this helps.

There are some 140 mm fans that fit in 120 mm fan positions with adapters, and they can push equal air at lower rpm. See

http://www.frozencpu.com/products/2502/fan-201/AeroCool_140mm_Streamliner_Fan_w_120mm_Adaptor_-_SILVER.html?tl=g36c15s61

Maybe this same principle (using an adapter) can be used to add a larger, quieter fan to the Infrant NV/NV+?

Also, there are a lot of things that can improve noise for a given fan size: using a good fan design. See silentpc review as already suggested and http://quietpcusa.com/index.html. Also, minimize turbulence to reduce noise by making sure that there are no obstructions (grills etc.) within an inch of the fan's blades on the side that air come out of: this can be done using spacers if necessary (this is just one bit of info that I think I understand correctly from silentpcreview and elsewhere after months of searching to quiet my pc, not a thought original to me).

In general, this is hard to accomplish, since for a given fan size, CFM is related to fan speed. And fan speed is related to fan noise. Now the quality of that noise may differ (high-pitched being more annoying than low-pitch).

That's why I asked people from Infrant to suggest one.

I guess that they tested a lot of fans and choosed the best compromise between performaces and price.

I'm willing to get one with better performaces in terms of cfm/noise ratio, it will probably cost more than the Adda they supply, but I don't care since it could preserve my psu life.

muri wrote:

In general, this is hard to accomplish, since for a given fan size, CFM is related to fan speed. And fan speed is related to fan noise. Now the quality of that noise may differ (high-pitched being more annoying than low-pitch). That's why I asked people from Infrant to suggest one. I guess that they tested a lot of fans and choosed the best compromise between performaces and price. I'm willing to get one with better performaces in terms of cfm/noise ratio, it will probably cost more than the Adda they supply, but I don't care since it could preserve my psu life.

I agree I'd like Infrant to suggest a fan that provides increased performance, and would be willing to pay a higher price in order to prolong PSU and HD life.

It looks like mine has died. Is there a link to the RMA procedure? My unit is in the UK.

Thanks.

steford wrote:
It looks like mine has died. Is there a link to the RMA procedure? My unit is in the UK. Thanks.

Thank God I bought mine through Eaegis UK...

steford wrote:
It looks like mine has died. Is there a link to the RMA procedure? My unit is in the UK. Thanks.

Out of curiousity, did you follow the PSU service action?

You can contact Support using the link in my sig for RMA.

Bought from ultimatestorage. Email arrived while on holiday and was informed it was dead on my return. Checked the power cable today which was dead. Plugged in a working power cable and it sparked. I think it's a gonner.

Thanks for the link.

EDIT: Actually tried that link before. Never get a conformation code sent through.