Hi Jon;
On Fri, Feb 4, 2011 at 11:55 AM, Jon Elson <[email protected]> wrote:
> Don Stanley wrote:
> >
> >
> > Also the steps in the sawtooth are one millisecond, the thread rate.
> >
> You may not be able to control a 60 Hz machine with a 1 ms sampling
> rate. That is only 16.7
> samples per cycle.
>
I was suspecting that would be needed but haven't finished the through.
I am planning a gear sensor on the generator shaft with approx 10000
pulses per second.
Will that make the problem go away?
> > On start up EMC2 is driving the generator to 120 HZ
> > to
> > get the target position in sync.
> >
> >
> > But,
> > if I can't get the over speed under control I may have to abandon this
> > approach.
> >
> That's easy, just put the commanded speed through a limit component, and
> limit it to something
> sane like 65 Hz. It will only go a little above the normal speed until
> it is in sync, then drop
> back to 60 Hz.
>
Good. I don't remember how but I had convinced myself that was iffy.
Maybe it was when EMC2 ignored MAX_VELOCITY = in the .ini.
Thanks again
Don
>
> Jon
>
>
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------------------------------------------------------------------------------
The modern datacenter depends on network connectivity to access resources
and provide services. The best practices for maximizing a physical server's
connectivity to a physical network are well understood - see how these
rules translate into the virtual world?
http://p.sf.net/sfu/oracle-sfdevnlfb
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