Re: Loosing position and need help...

For a long time I was been very confused about
the difference between a G320 and G340 so if
I understand this right the G320 works with
the encoder resolution as is and the G340 actualy
divides this resolution to require lower pulse rates
from the computer.
Is the G340 adjustable for different division ratios?
Why call this a multiplier when what it dose is divide?


--- In CAD_CAM_EDM_DRO@yahoogroups.com, R Rogers <rogersmach@y...>
wrote:

>
>
> Stephen Wille Padnos <spadnos@s...> wrote:
>
> R Rogers wrote:
>
> [snip]
>
> >Encoder resolution? The G320 has a max pulse rate of 250

quadrature. Any resolution above 1000 CPR would require the G340 with
step multiplier.

> >
> This isn't quite right.
>
> The G320 and the G340 have the same internal limitation of 250KHz
> (250,000 counts per second). Note that that's per second, not per
> minute - this is 15 million pulses per minute. A 1000-CPR (4000 PPR

in

> quadrature) encoder can spin at 3750 RPM before you hit that speed

limit.

>
> ///I originally had 1000 CPR encoders (4000 PPR) and was told by a

very reliable source that their resolution was too high and would
need the 340 instead and should stay below 250 quadrature for the
320. Thats what I remember but that may have been said due to the
software being only capable of 45,000 Hz. pulse rate.

>
> //////
>
> The pulse multiplier doesn't increase the maximum rate that can be
> achieved, it reduces the step rate necessary to achieve a

particular

> speed. That allows software based step generators (EMC, Mach2, Ah-

Ha,

> etc) to get faster speeds with their limited step output rates.
> Something like Jon Elson's USC can output 300K step pulses per

second,

> so that wouldn't require a G340 even at full speed.
>
> - Steve
>
> [rest of thread snipped]
>
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