Re: [isp-wireless] RB333 heat

[Scott Reed <sreed@...>]

I don't know that you can see the temperature.  You can get the fan 
voltage from system->health or OID: .3.6.1.4.1.14988.1.1.3.8.0


Travis Johnson wrote:
> Hi,
>
> That's a great idea. As I mentioned, we have about 50 RB333's in the 
> field, and only about 5 of them failing. Those five are all in direct 
> sun from about 1:00PM to 6:00PM (and they start failing around 3:00PM 
> each day). Something to just block the sun would probably fix the 
> problem, and would be much easier to install.
>
> The specs on the RB333 say operating temperature is up to 149F. I 
> don't see anywhere that shows the current temp on the board in Winbox?
>
> Travis
> Microserv
>
> Tom wrote:
> > At 09:41 AM 7/4/2008, you wrote:
> > > Yes, they fit (just barely). I'm wondering about putting a fan on 
> > > the hinged front door with a cover over the outside and have the air 
> > > blow out.
> > The problem is that you also need to add a vent that allows the air 
> > to draw in.  And you need to keep water out.
> >
> > A better solution might be a sun shield for the box.  That allows you 
> > to keep the box sealed.
> >
> > A sun shield is a light colored sheet metal or plastic shield mounted 
> > at least 3/4 inch off the outdoor box on the "sun side".  The sun 
> > side is to the south or south west and overhead in North America.  
> > The minimum 3/4 inch air gap allows air to flow between the box and 
> > the shield.  This helps to draw away the heat that the sun shield has 
> > blocked.
> >
> > As you can guess, the temperature inside the box is much higher when 
> > exposed to direct sunlight than it would be in a shaded area.  The 
> > shaded area is what you are trying to create with a sun shield.
> >
> > Probably worth a try.
> >
> > You might also log and graph the temperature that the RB333 is 
> > running at.  It would be interesting to see at what temperature the 
> > failure point lies.
> >
> > Tom
> >
> > >  I think it would work, just wondering how long it will last during 
> > > the winter.
> > >
> > > Travis
> > >
> > > Scott Reed wrote:
> > > > Wow, that is going to be tight, isn't it?  Didn't realize a RB333 
> > > > would fit in a DCE.  Certainly no room for a fan of any size.
> > > > I haven't looked very much for fans as all my RB333s are in open 
> > > > air, so I can not help there.
> > > >
> > > > Travis Johnson wrote:
> > > > > Any suggestions for a fan that will work on a DCE case that will 
> > > > > also plug into a 333 board?
> > > > >
> > > > > Travis
> > > > > Microserv
> > > > >
> > > > > Scott Reed wrote:
> > > > > > Maybe that is why the RB333 has fan controls on it.  Try a fan or 
> > > > > > two as the card has automatic failover if the primary fan dies.
> > > > > >
> > > > > > Travis Johnson wrote:
> > > > > > > Hi,
> > > > > > >
> > > > > > > With temps now hitting 95F in the late afternoon, we are seeing 
> > > > > > > several RB333 boards shut down and/or reboot. Once it cools down 
> > > > > > > they go back to running fine. We have seen 5 boards out of 50 we 
> > > > > > > have installed fail. They are all in DCE cases. Just wanted to 
> > > > > > > share with everyone in case they are seeing strange problems 
> > > > > > > with these boards.
> > > > > > >
> > > > > > > Travis
> > > > > > > Microserv



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--
Scott Reed
Owner
NewWays Networking, LLC
Wireless Networking
Network Design, Installation and Administration
Mikrotik Advanced Certified
www.nwwnet.net
(765) 855-1060






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