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Old Nov 29, 2012, 02:54 PM
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Germany, NRW
Joined Feb 2001
537 Posts
Hey guys,

great information here, thanks all for sharing. :-)

I just came from testing my 24v PSU, and have a **HUGE and DANGEROUS** problem, hope you can help me.

One 12v HP PSU is "normal", so no disconnected AC ground or something. On the 2nd PSU I disconnected AC ground from the inside 3 pin connector inside the unit.

When I put them in series, I tried two scenarios:

1) The modified PSU with no AC ground provides the (+) for 24v, the other one provides the (-)
RESULT: I have 24v for 2 seconds, then the voltage drops to 12v again. Not good

2) The modified PSU with no AC ground provides the (-) for 24v, the other one provides the (+)
RESULT: I have a steady 24v on the output, however both AC power cables of the PSUs went crazy hot (! almost melted!) after only 10-20 sec. run. I instantly disconnected both units from power, smoke came up.

Does anyone of you experts have an idea what went wrong?!

Thanks a lot in advance,

Jens
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