Re: Gecko 320 not pulsing

Corrections:
Yeah, after review of the high speed opto data sheet, the reverse
voltage for the LED is 5v, so use a lower 5v supply to do
the testing. Generic optos can take the 9v voltages I mentioned
earlier with proper current limiting.

I've only had G340's, so the multiplier board has the polarity option.

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Jon Elson <elson@p...> wrote:
>
>
> Lee Studley wrote:
>
> >Hi,
> >The "singing" is good, now the servos are dithering and the G320
are
> >working as they should. So more correctly, the PDMX is not
pulsing.
> >This may also be due to the SW not pulsing, or the parallel port
not
> >pulsing ( not trying to be a smart-alec, just pointing out the
logical
> >progression needed to trace down a falure of the expected. )
> >
> >Now you are at the other issues, Steps to do:
> >1) Manually pulse the G320 to verify. For example get a 9v battery
> >with clips. Hook a 1K resistor in series with the positive lead.
> >Connect the other side of the resistor to the common on the G320
> >step/dir/com block. Take the negative lead and carefully tap the
step
> >input. ( note: Add temp wires to make this easier )
> >
> So far, so good.
>
> >If nothing happens, try reversing the positive and negative leads
of
> >the 9v batt and repeat. !!!
> >
> AAKK! Don't do this, you could fry the opto-isolator in the G320.
> The common terminal is +.
>
> >Always include the series resistor or you
> >may damage the G320 step dir inputs. When its steps make note of
which
> >polarity is hooked to the common. The G320 have a jumper to
reverse
> >the common as indicated in the G320 datasheets. Its under the
cover.
> >The G320, if I remember, comes default jumpered internally as
common
> >== +5, with the Step/Dir being active low pulsed.
> >
> >
> The G320 is ALWAYS common +. It is only on the G340 that you have
> the option.
>
> Jon