how to? dual psu?

[KORI]

i want to hook up a 2nd psu to my server to had more hdd's. how do i wire it so that they both turn on when i boot the system and both turn off when i power down the system

 

[Ice Czar]

synch 2 PSU each as a seperate bus

1. Hardwired
2. With a relay

or employing a shared bus Like a redundant PSU

1. with resistors
2. with mosfets
or how its really done
3. with diodes (Single Source Fault Tolerant Power Systems)

(3 is slightly outdated now see gee's post > http://hardforum.com/showthread.php?t=776885)

I ran 2 hardwired 400 watts and a large array for 3 years without issue on one of my boards (Abit KR7A)
however it may have been a contributing factor in the death of another board (ECS whatever )
though Im not at all sure about that

not running them synchd however certainly corrupted the hell out of the array
eventually switched to a Zippy Emacs MR3-6450P N+1
with considerably less total wattage but plenty for what was actually required
with 32A on the +12V rail for the drives and considering the mobo's VRM was powered off the +5V

how many drives are you going be running and what PSU form factor is the current PSU?
a replacement with a single new supply (even a PS\2 ATX12V) might pump up the +12V rail to deal with the config

 

[KORI]

belive it or now im running dual 2400+ mp's on a tyan mpx board with 6 hdd's ( 2x 120 2x160 & 2x200) and a ati 9000 pro i want to add my 4x200 drives to the system they are all powered by a antec 300watt psu

 

[starhawk]

wire a relay to your current psu's 12v line, you'll need something like a white-rogers 120 series relay. get a 250w at psu (directron has them for less than $20) and swap the switch for the relay.

here is a link to a place you can buy the relay at, it is the 4th item down.
http://www.robotcombat.com/marketplace_solenoids.html

 

[Rikky]

The cable on the picture was bundled with my CM Stacker, it's for connecting two PSU's together. Pretty neat, but I don't know where you can buy just the cable.

 

[Ice Czar]

well a PCP&C 510 would certain run that (33 amps on the +12V rail)
but then its a bit pricey

a HDD typically requires 2A on the +12V for spinup
but only .5A once its spinning
one of the reasons youve seen SCSI employed alot in NAS or servers
it has a delay spinup option with many controllers

I dont see that mobo listed at your site
there could be quite a few single PSUs that would do

but as mentioned you could use an old AT as well, hell Ive got a closet full of em

 

[Darkeone]

I thought I saw some e-tailer selling the relays made especially for hooking up two psu's. Anyone remember where. i thought it was cyberguys, but I can't find it on there site

 

[bvincent]

http://www.ateck.com/viewItem.asp?idProduct=453056250 this might work I don't know, its different than the one I got with my stacker case.

 

[Darkeone]

I can't tell if that is for 2 psu's to one mobo or one psu to two mobos......hmmmmm

 

[Canon]

It's splittinng one ATX PSU ATX connection into two as far as I can tell. I'm not sure what use there would be in that, at least in modern a PC's power requirements...