I have 3 cabs each with 48u of modules with one 900 PSU per cab. About
1/3 of the modules are MOTM, 1/3 Oakley and 1/3 misc.
FWIW I found that using CGS PSU delay boards to stop all the modules
powering up at once in each cabinet makes the 900's way more stable.
They can tolerate many more modules.
I probably should calculate the actual current usage per PSU to make
sure it's all safe but i understand the 900's will auto-shutdown if
you milk them too hard.
ac
On 4/11/07, Scott Juskiw <scott@...> wrote:
> I agree with Dave, use redundant supplies and lots of them, and keep
> the digital modules in a separate cabinet with their own power
> supply. Although the MOTM-900 power supply suggests how many modules
> you can safely power with it, that number goes way down once you
> start adding non-MOTM modules and other daughterboard enhancements.
>
> I currently have 6 cabinets, each cabinet has 36U of modules, and
> each cabinet has their own MOTM-900 supply. For the past few years
> most of my cabinets have had a few empty spaces in them so each power
> supply has had to serve about 15-18 modules. But over the past few
> months I've been filling up the cabinets and finding, especially
> after adding additional daughterboards to many of the modules, that
> I'm running the power supplies dry (the non-MOTM modules are the
> worst power hogs). Now I'm going to have to disassemble the whole
> thing and double-up the power supplies in each cabinet. groan.