Re: [CAD_CAM_EDM_DRO] GECKO resistors

Chuck

If you didn't find this little note some where in the manual... the
resistor Should go on the drive side of the motor cable. To me it
shouldn't make any difference but the experts say otherwise. I bought 2
pre wired motors with heavy cables, factory installed resistors on the
motor end plug. The 3rd motor I wired up with a close enough resistor
I had also on the motor end. The 2 factory motors get pretty dang hot
after about 30 min, my close enough was about where I thought they
should run temp wise, good and warm but not hot.

I plan on moving the resistors, just have not got around to it, all 3
work very well. I am very glad I sprang for the G540.

Dan

On 11/22/2011 7:24 PM, Chuck Merja wrote:
>
> Thanks guys - yes, I meant 2.8Amps - oops - and your trivia makes sense,
> once stated, Lou - didn't really think of it before that tho. Shud be
> up and
> running in AM.
>
> Chuck Merja
> Actually (a little bit of trivia) ...
>
> The values you will most likely find for a 2900 ohm resistor will lie
> between one of two ranges: 2755 to 2842 and and 2958 to 3045. There is a
> hole between 2842 and 2958 because 2% (and higher) precision resistors
> are cherry-picked from the manufacturing run.
>
> Lou
>
> -----Original Message-----
> From: CAD_CAM_EDM_DRO@yahoogroups.com
> <mailto:CAD_CAM_EDM_DRO%40yahoogroups.com>
> <mailto:CAD_CAM_EDM_DRO%40yahoogroups.com>
> [mailto:CAD_CAM_EDM_DRO@yahoogroups.com
> <mailto:CAD_CAM_EDM_DRO%40yahoogroups.com>
> <mailto:CAD_CAM_EDM_DRO%40yahoogroups.com> ] On Behalf Of Andy Wander
> Sent: Tuesday, November 22, 2011 3:10 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> <mailto:CAD_CAM_EDM_DRO%40yahoogroups.com>
> <mailto:CAD_CAM_EDM_DRO%40yahoogroups.com> ;
> geckodrive@yahoogroups.com <mailto:geckodrive%40yahoogroups.com>
> <mailto:geckodrive%40yahoogroups.com>
> Subject: RE: [CAD_CAM_EDM_DRO] GECKO resistors
>
> I guess you mean the motors are 2.8A?
>
> I think you will be fine with the 2.9K resistor.
>
> Note that the specs call for a 2.8K 5% resistor, meaning it could
> actually measure anywhere from 2.66K to 2.94K ohms.
>
> If you have a good ohmmeter, measure your 2.9K resistors, and select one
> that is on the low side of IT'S tolerance. For instance, if your
> resistors are 5% units, they can be anywhere from 2.755 to 3.045K ohms.
> Andy Wander
>
> -----Original Message-----
> From: CAD_CAM_EDM_DRO@yahoogroups.com
> <mailto:CAD_CAM_EDM_DRO%40yahoogroups.com>
> <mailto:CAD_CAM_EDM_DRO%40yahoogroups.com>
> [mailto:CAD_CAM_EDM_DRO@yahoogroups.com
> <mailto:CAD_CAM_EDM_DRO%40yahoogroups.com>
> <mailto:CAD_CAM_EDM_DRO%40yahoogroups.com> ] On Behalf Of Chuck Merja
> Sent: Tuesday, November 22, 2011 6:00 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> <mailto:CAD_CAM_EDM_DRO%40yahoogroups.com>
> <mailto:CAD_CAM_EDM_DRO%40yahoogroups.com> ;
> geckodrive@yahoogroups.com <mailto:geckodrive%40yahoogroups.com>
> <mailto:geckodrive%40yahoogroups.com>
> Cc: 'Chuck Merja'
> Subject: [CAD_CAM_EDM_DRO] GECKO resistors
>
> I got my G540 and see that I need some resistors across the 1 and 5 pins
> on
> each motor drive. The motors are 2.8 ohm, so I need 2800 ohm resistors.
> I
> have 2900 and 2200 - is it ok to use the 2.9K?
> thanks
>
> Chuck Merja
>
> [Non-text portions of this message have been removed]
>
>



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