ira-k

I've finally gotten around to wiring up my relays and thought I would take a couple of pic's of them since we get this question asked every now and them.

When 12 volt DC current from the controller PSU is applied to a mechanical or a solid-state DC input relay,the normally open contacts will close allowing current to flow to the pump or the TEC PSU.When the 12 vdc current is removed, the relay contacts go back to their normally open position and the current to the pump or TEC PSU stops.

The first pic is of a Crydom # D2425 solid-state relay.This relay is rated for 25 amps and you can find new ones on E-bay for less then $10.00.I would suggest this one over the next relay I will show you how to wire.The smaller 2 terminals are for the 4-pin Molex wires from the PSU that you want to use to start your pump or TEC PSU,normally your computer PSU.One is marked with a + sign,attach your yellow 12V Molex lead to this one.The other small terminal is for a black or negative wire.
The two larger terminals are for the AC side of the relay.Simply cut your black AC lead and install each side of the black wire to these 2 terminals.This side is your power cord for the pump or PSU that you are wanting to control.Simply plug the 4-pin Molex side into your computer PSU and whatever you have attached to the AC relay side will now come on with the computers PSU.Both sides need to have ring terminals crimped on the bare wire tails.


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The next relay pic is the Swiftech or Danger Den pump relay, its only rated for 12 amps so I would only use this one for AC pumps or small PSU's,I use this one to control my 100 watt radiator fan psu and my 200 watt pump PSU.It comes with a socket that you can cut a hole in your case or whatever and install.Then a AC power cord is plugged from the wall into it.One leg of this socket is already wired into the relay with a red wire.Simply run your pump wires to the socket and relay.The white neutral and green ground wire will go to the socket.The black wire will go to the second terminal of the relay, the one next to the red from the socket.The 4-pin Molex is already attached to the relay.Wire it like that and your ready to run with it.



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Zeraphil

Wait, I don't understand, you use two PSU's, one for TEC and one for the PC, and this relay works as a bridge that will turn on both when you press the switch on the PC?

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ira-k

Right...It turns on my TEC PSU when I turn on the main comp...That way any time my main rigs PSU is on my TEC PSU will be on to, its a safety...Or if your using a AC pump it will turn it on...Or whatever you want to come on when your comp does..

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DuckieHo

A relay is basically a powered switch. It switches state when power is applied to it. The main PSU applies power to it and it then closes a circuit to allow another PSU to turn on.

http://en.wikipedia.org/wiki/Relay


Ira, couldn't you have the TEC PSU turn on your PC PSU instead? This way the TEC will always be running for like 1s before system powers up. If the TEC PSU failed, the system would shut down.

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To answer most of your questions: (1) a fridge cannot cool a PC (2) 64-bit OS for over 3.4GB (3) If a PCIe card fits, it should work (4) Resolution, not screen size (5) If you have a question, it is not news (6) Report, not respond to Spam (7) Single-Rail/Non-Modular PSUs are not always better than Multi-Rail/Modular

ira-k

Yeah you could...It would completely shut down my comp though then I'd have to redo my OC every time I turned it on...I set a shut down temp for my comp of 20C so hopefully it will catch it...I have to go into bios every time I turn it on and let it get down to 6C before I can load into Windows anyway..But yeah you can control any AC devise from a DC source with a DC input relay...Or exactly the opposite with a AC input realay..

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Zeraphil

That's cool, I need to study more of this, but with molecular biology, my time is almost completly taken.

Instead of having to load into the BIOS, isn;t there anyways to put a 6 second delay into your startup so you can get that same effect of the TEC warming (or should I say, cooling) up?

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DuckieHo

Time Delay Relay. However, they are much more complicated and expensive.

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To answer most of your questions: (1) a fridge cannot cool a PC (2) 64-bit OS for over 3.4GB (3) If a PCIe card fits, it should work (4) Resolution, not screen size (5) If you have a question, it is not news (6) Report, not respond to Spam (7) Single-Rail/Non-Modular PSUs are not always better than Multi-Rail/Modular

Zeraphil

Not worth it then.

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loop0001

....so confused

DuckieHo

why? It's switch.

__________________
To answer most of your questions: (1) a fridge cannot cool a PC (2) 64-bit OS for over 3.4GB (3) If a PCIe card fits, it should work (4) Resolution, not screen size (5) If you have a question, it is not news (6) Report, not respond to Spam (7) Single-Rail/Non-Modular PSUs are not always better than Multi-Rail/Modular