Electronics > Beginners

SMPS issue?

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_ar_:
Hi,

I have a Meanwell RT-50B SMPS which I have wired up a couple of days ago, correctly, to my best knowledge. However, I noticed something strange, but I'm a noob so what do I know: there's connectivity between the PSU's +12v, COM and +5v lines. Is this normal for these supplies? Checked an ATX v1.0 supply and there's no such thing. The wired up PSU also does not work.

Thanks for your response!

_ar_:
BTW, I have checked all my wiring and there're no shorts.

X:
What do you mean by "there's connectivity between the PSU's +12v, COM and 5v lines?" As in continuity (ie. zero resistance between these lines)?

Most likely the PSU is setup like this at the output:

0V --[5V]-- +5V --[7V]-- +12V

_ar_:
Yup, meant to write 'continuity', sorry for that. So yeah, theres continuity between the +12v and +5v terminals as well. But then it can happen and be perfectly normal, depends on the PSU's design, if I understand you right. Thanks for your answer. I need to do some more fault finding then :).

X:
You're saying continuity between 0V+12V, 0V+5V, and 5V+12V? Zero ohms between these rails doesn't sound right. Do you actually get any voltage out of them with a load across?

What sort of multimeter do you have? I have encountered cheap Chinese ones that will beep if the continuity tester is connected to some circuits even though there's several hundred ohms in between the probes, or if there is some kind of arbitrary exotic circuit connected.

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