Ddc pump wiring.

Defy Belief · 15 Jul 2020 at 22:12

OK so I picked up a new sf600 for my compact build I've done.

Previously I had a Silverstone 450w.

My ddc pump i bought was previously working, but oddly it had been wired so that instead of a molex connector, it was wired into a 6 pin connector that went straight into the sata/perif section of the modular psu.

Installed new psu, did the same thing and nothing, pc boots fine but there is no output from the pump, I think I saw a tiny movement of the water then nothing, I assume the wiring for the two is different or the corsair unit does not allow direct power from a 6 pin device.

I am hoping I've not killed the pump.. I've ordered a molex kit to rewire the pump but any other thoughts or if I've likely killed my pump please let me know

the 2 pins in the 6 pin were on either the far right or far left so like

Wire. Blank. Blank
Wire. Blank. Blank

Found the wiring diagrams;

lord filbuster · 16 Jul 2020 at 00:24

That pinout for the 6 pin doesn't make much sense, if the wires were either pin 1 and 4 or 3 and 6, that means the pump was either running at 5v, or between the 12 and 3v lines. I'd have thought it should just run between ground and 12v, with rpm / pwm sense wires if any, but those wouldn't go to the psu at all.
I guess someone could have wired it to run between 12v and 3v to run at a lower speed. Was it a custom wiring job? It seems a bit odd to sell these commercially, as the pinouts on the modular supplies aren't standardised.

On the plus side I doubt you killed it on the corsair, if that pinout is right, it looks like you either ran the pump between 12v and ground, in which case I'm not sure why it didn't work, or you ran it between 3v and ground, so I'd expect it would stall or not start at all. The voltage pins on the power supplies should all just be dumb power rails, they just provide whatever voltage and whatever current the device tries to draw, up to whatever it can handle.

Defy Belief · 16 Jul 2020 at 08:13

lord filbuster said:
That pinout for the 6 pin doesn't make much sense, if the wires were either pin 1 and 4 or 3 and 6, that means the pump was either running at 5v, or between the 12 and 3v lines. I'd have thought it should just run between ground and 12v, with rpm / pwm sense wires if any, but those wouldn't go to the psu at all.
I guess someone could have wired it to run between 12v and 3v to run at a lower speed. Was it a custom wiring job? It seems a bit odd to sell these commercially, as the pinouts on the modular supplies aren't standardised.

On the plus side I doubt you killed it on the corsair, if that pinout is right, it looks like you either ran the pump between 12v and ground, in which case I'm not sure why it didn't work, or you ran it between 3v and ground, so I'd expect it would stall or not start at all. The voltage pins on the power supplies should all just be dumb power rails, they just provide whatever voltage and whatever current the device tries to draw, up to whatever it can handle.

Yeah it was a custom wiring job (as I bought the psu off the same guy). So I just grabbed the connector out of the bin, I got it wrong, so it's in pin 1 and 2, so 12v and ground on the Silverstone diagram. Looks like this might be 12v and an empty pin on the corsair one so it would have tried to run without a ground, likely dead as a result?

or maybe the corsair psu just didn't supply power without the ground as a protection, maybe that's why I saw an initial movement of water then it stop as a precaution. guess I'll find out when I wire the molex..

PWM signal goes into the motherboard.

lord filbuster · 16 Jul 2020 at 09:52

No, that's not going to have caused it any harm, it just won't run. The ground in this case isn't like an earth pin on a plug, it needs both to be connected for current to flow.
As long as you make sure you get the 12v and ground wires the right way round when you add the molex it will work. Have you got a link to the kit?

Defy Belief · 16 Jul 2020 at 10:03

lord filbuster said:
No, that's not going to have caused it any harm, it just won't run. The ground in this case isn't like an earth pin on a plug, it needs both to be connected for current to flow.
As long as you make sure you get the 12v and ground wires the right way round when you add the molex it will work. Have you got a link to the kit?

That's good! Can't link due to competitor, it's literally a male and female molex connector with the pins, I'll just obviously only use the male connector, then will use the dedicated molex peripherals cable that came with the psu for it to go into.

Was literally just going to go by a stock ddc pump photo, think it's yellow (assume 12v) and black (assume ground) next to it with the two pins on the other side blank.

It's this pump https://www.overclockers.co.uk/ek-water-blocks-ek-ddc-3.2-pwm-12v-pwm-pump-wc-517-ek.html

lord filbuster · 16 Jul 2020 at 10:49

Yeah that should be it really, I've rewired the same pump, the yellow is definitely 12v. Might be worth leaving the pwm connector off the motherboard the first time you start it, this should force it to run full speed, so you know it's working.

LuckyBenski · 16 Jul 2020 at 20:16

lord filbuster said:
Yeah that should be it really, I've rewired the same pump, the yellow is definitely 12v. Might be worth leaving the pwm connector off the motherboard the first time you start it, this should force it to run full speed, so you know it's working.

Second this, just get it running with minimum variables first.

I have run a DDC off a 9V battery for testing and flushing but some draw more current than others so it's not a given it would work for you. It's really handy for testing fans and pumps though - anything that runs off 12V, keep a 9V battery and some jumper wires handy.

Defy Belief · 17 Jul 2020 at 21:26

lord filbuster said:
Yeah that should be it really, I've rewired the same pump, the yellow is definitely 12v. Might be worth leaving the pwm connector off the motherboard the first time you start it, this should force it to run full speed, so you know it's working.

LuckyBenski said:
Second this, just get it running with minimum variables first.

I have run a DDC off a 9V battery for testing and flushing but some draw more current than others so it's not a given it would work for you. It's really handy for testing fans and pumps though - anything that runs off 12V, keep a 9V battery and some jumper wires handy.

Stripped the 6 pin off and wired it into the molex, I now have a working pump

Thanks both!

LePhuronn · 3 Aug 2020 at 10:10

Glad it's working, I was literally about to say I have both the SF45-G and SF600 Platinum here and the 6-pin "peripheral" connectors on the Corsair are wired differently.

Also, did you notice the 6-pin "peripheral" connector on the SF600 is not keyed the same as a PCI-E connector?