RE: [CAD_CAM_EDM_DRO] GECKO resistors

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@yahoogroups.com] On Behalf Of Andy Wander
Sent: Tuesday, November 22, 2011 3:10 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com; geckodrive@yahoogroups.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@yahoogroups.com] On Behalf Of Chuck Merja
Sent: Tuesday, November 22, 2011 6:00 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com; geckodrive@yahoogroups.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