Re: mvme6100 HW issues?

[Kate Feng <feng@bnl.gov>]

On 03/02/2012 04:03 PM, Kasemir, Kay wrote:
> Hello Kate:
>
> We saw mvme5500 boards overheat in open laboratory crates
> or when on extender cards, meaning they were out in the open
> without any forced air cooling.
> For MVME2100 that was OK, but the 5500 dies.
>
> The 5500 was also getting quite hot in VXI crates
> where the cooling was previously dialed down to reduce
> noise.
>
> They seem fine in ordinary VME creates,
Agree.  The  backplane of the VME crate is less compact
as compared with other kind of crates such as VME64x.
I suspect that the overheating of the mvme6100 will not
happen in a standard VME crate, which would
simplify the problem if those extra pins
and features from the VME64x crate are not needed.

Cheers,
Kate
> also in our
> VXI crates when the fans are running full speed.
>
> Regards,
> Kay
>
>
> On 3/2/12 15:52 , "Kate Feng"<feng@bnl.gov>  wrote:
> > On 02/01/2012 12:18 PM, Kasemir, Kay wrote:
> > > At SNS, we updated from the MVME2100 to the MVME5500.
> > > The 2100 runs forever without added cooling on extender boards
> > > in open crates in laboratory setups.
> > > The 5500 needs forced cooling right across its heat sinks;
> > > it will otherwise soon overheat.
> > I am surprised that the mvme5500 overheated.  Did you use
> > a regular VME crate or a VME64x crate with the mvme5500
> > board ?  So far, we do not have the overheating problem
> > on our mvme5500 boards.