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Topic: Power supply with Multiple Voltage Out ~ Help (Read 1 time) previous topic - next topic

JimboZA

Whoop Whoop.... 650W PSU has just landed on my desk.... should be able to run a few servos from that!
Roy from ITCrowd: Have you tried turning it off an on again?
I'm on LinkedIn: http://www.linkedin.com/in/jimbrownza

PedroDaGr8


Whoop Whoop.... 650W PSU has just landed on my desk.... should be able to run a few servos from that!



Sweet, keep an eye on your voltages when you first test it out. The first test i would do is to cross load it REALLLY heavy (put a heavy load on the 5V line and a minimal load on the 12V line) and see how far out of spec it goes. Most modern PSU's do not enjoy being cross-loaded though good ones handle it fine just their efficiency suffers, the bad ones just go nuts.

JimboZA


~is it ok for the 5v o/p to supply 5 servo motors?

I haven't found any decent datasheet for the type of servo motor (TOWER PRO mg995)
that i''m using so i haven't found out yet how much amp is needed.


The ones I've seen run from 4.8 to 6V.... but they don't always quote current it seems.
Roy from ITCrowd: Have you tried turning it off an on again?
I'm on LinkedIn: http://www.linkedin.com/in/jimbrownza

JimboZA


Most modern PSU's do not enjoy being cross-loaded though good ones handle it fine just their efficiency suffers, the bad ones just go nuts.


Cross-loaded meaning what Pedro?- an out of balance over the various output voltages?
Roy from ITCrowd: Have you tried turning it off an on again?
I'm on LinkedIn: http://www.linkedin.com/in/jimbrownza

PedroDaGr8



Most modern PSU's do not enjoy being cross-loaded though good ones handle it fine just their efficiency suffers, the bad ones just go nuts.


Cross-loaded meaning what Pedro?- an out of balance over the various output voltages?


Modern PSU's are designed expecting a heavy load on the 12V line and a much lighter load on the 5V line. Loading up the 5v line while leaving little to no load on the 12V line can cause issues. For example, running 10A on the 5V line and 1A on the 12V line. You will often see the 12V line shoot way out of spec in voltage and the waveform on that line will look like rubbish.

Truthfully, in a badly designed PSU you will see it go out of spec if you do the reverse of the above (heavy 12V almost no 5V) as well.

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