Re: AC noise on DC effect stepper drivers?

Assuming their is no bad diodes that will be the ripple component
of the unregulated DC with some load applied. Check it again with-
out a load and the ripple will almost be zero. A normal condition.
If the ripple is seen to go in the negative direction more than a
diode drop (~.7V), assuming a positive outpu then something is
suspect.
Hope this helps, Rich Dean

Jon Anderson wrote:

>
> From: Jon Anderson <janders@...>
>
> My dad turned up something investigating our lost step problems and I
> wondered if anyone knows if the following can be a problem:
>
> Dad remembered that some full wave bridge rectifiers can leak AC into
> the DC output. He checked and found 43vac on top of the 43vdc we're
> getting out of our unregulated power supply.
> The power supply was built from schematics supplied with some CyberPak
> drivers I was using and consists of a transformer, capacitor, full wave
> rectifier, and bleed resistor for the cap.
>
> Can this AC be causing occasional lost steps? And even if not, is it
> something we really ought to filter out? (I'm assuming yes, but thought
> I'd ask)
>
> Thanks,
>
> Jon Anderson
>
> --------------------------- ONElist Sponsor ----------------------------
>
> Start a new ONElist list & you can WIN great prizes!
> http://www.onelist.com
> See homepage for details on ONElist's new "FRIENDS & FAMILY" program.
>
> ------------------------------------------------------------------------
> Welcome to CAD_CAM_EDM_DRO@...,an unmodulated list for the discussion of shop built systems in the above catagories.
> To Unsubscribe, read archives, change to or from digest.
> Go to: http://www.onelist.com/isregistered.cgi
> Log on, and you will go to Member Center, and you can make changes there.
> bill,
> List Manager

--
.
.~ ~ ~~ ~~____~,~~ ~~~__
. \------ |OO|_[]_[]__\/O
. .|_CMRy_|-|__|________|_|.
.____oo__oo__--"O=O=O"=[]oo\\____________________________________
.--Colorado Midland Railway---Rich---cmsteam@...---KT4IZ.