What can I do with the noisy fan on HP Procurve switches?
Terje Trane
(like 2512 and 2524). Thay cannot be used in an office environment. I mailed
HP but got back an answer that they believed they were not more noisy than
comparable products.
It has a Nidec fan called TA255DC model R34487-57. Which is 60mm x 60mm x
15mm, (there is not room for a larger/thicker one). This model does not
exist on Nidecs pages, it uses 5V, all other TA255s are 12 or 24V models
(http://www.nidec.com/dcfansquickguide.html) and customer support had not
heard about it, probably made specially for HP. It has three wires, Ground,
5V and signal. What kind of signal I don't know. According to the table on
http://www.nidec.com/motorscircuits.html you can get various types of signal
(tachometer or logical level ) but the -57 option does not exist in the
list.
Has anybody found a solution? Replacement? Temperature control? (I know
about "Noise Killer" but that's for 12V.) If it is a tachometer type I guess
I will get error messages. If it is level I guess I can just tie the signal
to ground.
I disconnected the fan on a unit for quite a while and the processor
heatsink did not get hot, (but this was on the bench without traffic on the
port)s but I don't feel comfortable with this.
shope
If the level is above that in the data sheet, you should be able to get it
swapped on warranty / maint. If this is a general issue, then you need your
trick with the fan, alternate kit or suppress the sound another way.
I.e. put it in a wiring closet, and sound insulate the rack and room!
This type of kit is usually cooled for sitting in a closed rack, in a warm
wiring closet, on a hot day. Keep it cool and it should carry on working, so
your trick with the fan has some room to work if you keep the box well below
the rated running temperature..
Rule of thumb for the electronics failure is every 10 deg C rise will double
the failure rate.
--
Good luck
Stephen Hope +44 780 002 2626
"Terje Trane" <terje...@hotmail.com> wrote in message
news:8M3s8.6437$gY3.1...@juliett.dax.net...
Roger Elmore
>Does anybody know what to do with the noisy fans on the HP
>Procurve switches (like 2512 and 2524). Thay cannot be used
>in an office environment. I mailed HP but got back an answer
>that they believed they were not more noisy than comparable
>products.
Comparable to what, jet engines? We use those models and if they're
out in the open you can hear them as soon as you walk in a room.
I used a 2524 in the Computer Center's bullpen (modular furniture)
area where the programmers are. I took a chance on a Rittal EL-series
glass front 3 part wall mount enclosure, removed the back for air and
put the switch and a patchbay in it. With the back about 2" away from
the cloth furniture panel, sitting on a carpeted floor under a desk
unit you have to be 3' away before you can tell if it is running, so
it *is* tolerable. We put it in the cubicle that the student workers
use. <g>
The alternative was to try to squeeze 24 Cat5e lines in the 1-1/4"
conduit that already had 10 Cat5e telcos. I opted for a 4 strand
fiber uplink rather than pull all that copper 100+ feet back to the
wiring closet.
--
Roger Elmore
UTM Department of Computer Services
Data Voice CCTV CATV Access Control
Al
issue. I also have some 3Com 3300 switches and they are too noisy for an
office environment if you are close - they drone like mad.
What you need to do is simply source the identical part (size and voltage)
from say Papst (who I specify as they are one of the best) or another fan
maker but ensure you use the low noise equivalent part. These typically have
a higher quality design but also run a little slower to keep the noise
down - but would still be fine for the application you have.
You can compare the noise output of your current fan by going to that
manufacturers site - they all quote noise output - to that of the low noise
equivalent so you get an ide of how much quieter it will be.
See www.papst.com to find your part number then order it from a local
distributor like RS etc.
al.
"Terje Trane" <terje...@hotmail.com> wrote in message
news:8M3s8.6437$gY3.1...@juliett.dax.net...
Mik
> (like 2512 and 2524). Thay cannot be used in an office environment. I mailed
> HP but got back an answer that they believed they were not more noisy than
> comparable products.
>
> It has a Nidec fan called TA255DC model R34487-57. Which is 60mm x 60mm x
> 15mm, (there is not room for a larger/thicker one).
HI TERJE,
The 2524 was never meant to be used in a working enviroment as desktop
or under the desk model. When you put it in a rack in the serverroom
there is no problem.
I'm surrounded by 3 of these and 2 4108's and I only "notice/enjoy"
the silence when I turn them off. The J4097B has no fan but only 8
ports and is unmanaged but very nice.
BTW did you know you voided your warranty when you opened the switch?
I have a 2224 switch running without a fan for about 3 years nowthe
room is about 20-25degrees. It's on the floor on a proxyserver it gets
warm/hot but never failed yet. On the other side I have only 7 nodes
connected.
Kind regards,
Mik