Re: Just to be completely sure - power supply size

Hello,

It's important to note that the Gecko "white papers" are referring to
GECKO drives in many instances... In too many cases, they have been
used as if the info was the same for ALL stepper drives. (Parts are.
But not all)

Mariss himself has said that the 2/3's "rule" is for HIS drives.

The guy(s?- Derek, I think) who developed the DenverCNC drive box did
some testing of/with the xylotex board and found that a 4A supply was
enough for full 2.5A x 3 operation...

Hope this helps,

Ballendo


--- In CAD_CAM_EDM_DRO@yahoogroups.com, "ghidera2000"
<ghidera2000@y...> wrote:

> Ok, I've manage to mis-remember this stuff before so I'd better
> check.
>
> Reading the Gecko stepper motor white paper, its says Bipolar

motors

> use 1/3 of their rated amperage. With this in mind, If I have three
> 2.5A motors, the power supply needs to be (minimum) 2.5A - not
> 3x2.5A. Is this correct?
>
> If so, I'd likely go up to a 3A or 4A transformer just to be safe.
>
> I'm converting my A3977 based 3 axis driver schematic to opto-
> isolation. I'll post it for (brutal) scrutiny later today.