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DON&#39T EVER DO THIS!!!!!!!!!

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T

The Master

Guest
I was putting in a few more fans (2 80mm+1 35mm) witch I ofcourse plugged in wrongly!

(Yellow=12V DC, Black=ground, Black=ground, Red=5v DC)

When I connected my fans I used the chassis ground instead of the ground in the P/s. By doing so I introduced a new volt potential...220V!!
This volt potential is normally kept out of the electrical system.
By using 12vDC in one end, I was using 220v in the other, and this can only end in dismay!
Smoke suddenly came up through the P/s and my heartrate jumped bigtime!
Big questions came through my head:"what went wrong?!, did i screw up the ENTIRE computer?!" and so on..
Luckally, I used the 12vDc in combination with the chassi, using the ground or the 5vDc would have fried the curcuits of the motherboard and the HD's,all PCI cards, the AGP and so on...
This little incident only(!) fried my P/s...
So kids...Don't try this @ home!
 

dimmreaper

Senior Member
Joined
Dec 16, 2000
Location
home
When you say you used the chassis ground do you mean you attatched the black fan wire to the chassis? If thats what you did, you shouldn't have had a problem as I wire fans that way often . . . . .
 
OP
T

The Master

Guest
Really? Then you're in luck! It might work fine now...but you will be safer off if you use the P/s ground instead of the chassis.
 

dimmreaper

Senior Member
Joined
Dec 16, 2000
Location
home
The Master (Dec 28, 2000 08:46 a.m.):
Really? Then you're in luck! It might work fine now...but you will be safer off if you use the P/s ground instead of the chassis.
I tore my PSU apart. Their is a wire leading from the PSU ground wire cluster leading to a screw in the PSU thus make the chassis ground and PSU ground on in the same. Another thing I noticed was that their is no difference between -5V and -12V the wires all lead in to a white square printed on the PCB that is labled "Ground". this is the same cluster of wires that has a wire leading to the screw in the PSU grounding the whole case. It would be un-wise for a PSU manufacturer to connect the -220 ACV to the chassis as it would have enough current for positive currents to arc off the motherboard to the motherboard tray. I think you problem lies somewhere else.
 
OP
T

The Master

Guest
I don't think the problem is elsewhere, only the translation maybe wrong.
Swedish/English translation is very diffcult...
I hope some of you understood....
Always connect the fan wires to the P/s cables. (Even if I am wrong, it is safer to have the cables in the P/s connectors...)
 

Deviant

Registered
Joined
Dec 23, 2000
Location
New Zealand
Jeff is right, the Chassis and earth pins should be connected together, normally inside the power supply. With out this you have floating earths, in which case you can have 220V potential between them. In my country, and in every countries regulations that I know of, this is unsafe, and illegal for earth wiring not to bonded metal chassis.
You must have a fault, or someone has been tampering with your power supply. I have 4 lying around here and then chassis are all zero ohms to the earth wires.