Electronics > Beginners
Linking PC PSUs for a dual rig build.
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Crysis1982:
Hey guys.

I am looking to do a dual system build that will be cooled by a single custom water-cooling loop, but wanting to use three PSUs.
Two main ones to run the rigs and a secondary to run two Lang D5 pumps, 16 case fans and pump/fan controlers.

So what I want is when either one of the main rigs is turned on, each main PSU is linked to the PSU that is looking after the cooling loop.

The PSUs will be in close proximity to each other as shown in the rear view of the case I will be using.

Any help will be appreciated.
Rerouter:
The psu on signal is switching a signal to ground, have the 5 or 12v rail switch the psu on signal of the third, with both switches in parrellel it would be either turn it on

The switch could be a relay, a mosfet with some protection, or a transistor with an appropriate base resistor.
Crysis1982:
I was looking into these prebuilt PCB options. May have to do some research to link together in the configuration I am looking for.
Crysis1982:
Another view of them in use.
Twoflower:
Why a third PSU? Using a DPDT Relais to switch between the PSUs to power the pump.

The coil is connected to a 12V rail of one of the PSU. While the N.O. is connected to +12V of the same PSU while the N.C. is connected to the +12V of the other one. The common pole goes to the 12V of the pump. The same goes for the other pole with GND. This prevents potential problems with the two GNDs of the two supplies.
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