--- In DynoMotion@yahoogroups.com, Tom Kerekes <tk@...> wrote:
>
> Hi Tapio,
>
> Better to get rid of the ATX supply anyways as it usually is not isolated from earth GND.
>
> Powering KFLOP+Kanalog from USB power is marginal.  You may want to add an additional +5V isolated Supply.
>
> Make sure you have reverse diodes across the relay coils so there isn't a big voltage spike when they shut off.
>
> The +12V supply used to drive the Relays should have its GND connected to Kanalog (either a screw terminal or the GND LUGs).  It isn't a good idea to send the relay currents through the ribbon cable GND to KFLOP and also through KFLOP GND.
>
> If you use the same +12V supply for driving the opto isolated limits as the relays then the limit switch wiring will not be opto isolated.   The 20ft of limit switch switch wiring can potentially pick up noise and inject it into the Kanalog/KFLOP/USB/PC DC GND.  So consider using a separate +12V isolated supply for driving the optos.
>
> HTH
> Regards
> TK
>
>
>
>
> ________________________________
> From: tapiolarikka <tapio.larikka@...>
> To: DynoMotion@yahoogroups.com
> Sent: Sunday, April 7, 2013 2:41 PM
> Subject: [DynoMotion] Re: Powering Kflop?
>
>
>  
>
>
> Hi Tom!
>
> I finally got so far that I pulled the parallel port out and started
> rewiring my mill to get KFlop in.
>
> Doing the rewiring I found the lack of space so bad that I had to give up on the atx power.
>
> I now have a small din-rail mounted 12V psu to power the relays and inductive limits. The limit signal lines are wired Kanalog opto-in on JP15 with opto negative going back to PSU negative as I think it should be.
>
> The relays however are bit confusing.
>
> I now have them wired:
>
> PSU+12V->Relay coil->Kanalog JP8->KFlop JR1/molex Ground->PSU -/Ground
>
> but I'm not sure if the KFlopJR1 in above chain is correct,just could not think of any other logical solution.
>
> The KFlop I plan to leave USB powered as the encoders get their power from drives.
>
> I was hoping either confirmation or warning on this before I turn on the power.
>
> Rgds,
> Tapio
>
> --- In DynoMotion@yahoogroups.com, "tapiolarikka" <tapio.larikka@> wrote:
> >
> >
> > Hi!
> >
> > I understood from my reading that
> >
> > -computer psu are excellet for use with KFlop and that
> > -it's adviced to use separate psu for relaus etc to avoid noice
> >
> > Rgds,
> > Tapio
> >
> > --- In DynoMotion@yahoogroups.com, Tom Kerekes wrote:
> > >
> > > Hi Tapio,
> > >
> > > I'm not sure I understand exactly what you mean.  But a problem with most ATX Power Supplies is that the grounds are all tied together and to chassis ground as well.  So if you are going to use that there isn't much point in trying to use USB power.
> > >
> > > Regards
> > > TK
> > >
> > >
> > >
> > > ________________________________
> > > From: tapiolarikka
> > > To: DynoMotion@yahoogroups.com
> > > Sent: Thursday, February 14, 2013 9:04 AM
> > > Subject: [DynoMotion] Powering Kflop?
> > >
> > >
> > >  
> > > Hi!
> > >
> > > I got thinking (with my space constraints) if it would be possible to power the KFlop from a powered USB hub and use the atex psu for relays etc.
> > >
> > > Rgds,
> > > Tapio
> > >
> >
>