Re: [CAD_CAM_EDM_DRO] Re: temperamental G's

Lee,

There must be something that I do not understand about the disable lines.
On my new cnc router that I am building for a local high school, I have
installed a contactor that has one normally closed contact that I had
planned to use for the disable line. At initial power up time, the disable
line would be set to ground until I activate the contactor (one contact is
used for a latch) Then the disable line will be open.

My intention is to use my EPO switch to un-latch the contactor, drop the
power to my power supply and drop power to my router and ground the disable
line.

Everything works fine with the exception that my gecko drives still think
that the disable line is grounded. I got no power to my stepper motors (I
can turn the lead screws by hand).

When I totally disconnected all of the disable lines from each drive, then
everything seems to work fine with the exception that I do not have a way to
activate my disable line.

Bob Campbell

----- Original Message -----
From: "studleylee" <indigo_red@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Thursday, January 31, 2002 11:24 AM
Subject: [CAD_CAM_EDM_DRO] Re: temperamental G's


> Hi,
> Just curious... ideas to try:
>
> 1)do you have the 'disable' pin grounded in any way?,
>
> 2)or maybe it is a simple as the port driving the step and dir inputs
> isnt producing enough current to drive more led's(opto inputs).
>
> 3)Try a 9v battery through a 1k resistor to drive the step inputs to
> statically test the G210's by themselves.
>
> -Lee
>
> --- In CAD_CAM_EDM_DRO@y..., "cadcamcenter" <cadcamcenter@y...> wrote:
> > Hi,
> >
> > I had 2 of the 3 G201A's working in a driver box when I tested them
> a
> > short while ago. Without changing anything to these 2 G201A, I
> > rewired the third one. When I tested them again, all 3 were silent,
> > including the 2 that were working earlier. I had similar problems
> > earlier, with the Geckos deciding to go on holiday for no reason
> > that I know of. A list member (thanks) helpfully suggested that the
> > 3us for the step pulse width was too low, so I reconfigured the
> step
> > pulse width to 5us. Still no luck. Since I'm hoping Mariss will
> soon
> > conjure up a new toy for all of us to play with, I do not wish to
> > distract him and hope that someone can provide some insight as to
> why
> > the 2 G201A which were working fine earlier can suddenly fall dumb.
> >
> > The Geckos are fine products as I have another 3 Geckos in another
> > box which are working fine. It is probably something other than the
> > Geckos. Is it that the Geckos need a rapidly rising edge for the
> step
> > pulse and less rapidly rising step pulse can cause the Geckos to
> > become temperamental, or Gecko's of different vintage have
> different
> > requirements, as the other 3 Geckos are working fine with the same
> > pulse train?
> >
> > Many thanks
> >
> > Peter
>
>
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