Re: Gecko connection to unipolar stepper??

Thanks!

15K would be correct if you are running full-winding (center-tap
unused). Make sure to adjust the trimpot (+/- 1/8 turn from half-
scale position) for maximum low-speed smoothness.

Mariss


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

>
> Mariss,
>
> I was using a 15k resistor as the white paper said to use half

the current. I must've misread that. The problem was the jumper on
the Breakout board was set common to ground instead of 5v.

>
> Anyways, What a difference!! Almost three times as powerful! Man

these are nice drives. It's so quiet, I didn't even know it was
running. I'm still checking things with a meter and hit the jog key
for the hell of it and away it went.

>
> Most pleased, Thanks, Ron
>
> Mariss Freimanis <mariss92705@...> wrote:
> So far so good; that is correct. Make sure the two unused wires

are

> insulated and not touching each other or anything else. Use a 33K
> current set resistor, connect 5VDC from your PC to COMMON (term

10),

> STEP and DIRECTION and you're good to go.
>
> Mariss
>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "rogersmach"
> wrote:
> >
> > Hey guys,
> >
> > Here is what I have and what it's doing..
> >
> > I'm trying to connect a 6 wire unipolar 3 volt 3 amp stepper to a
> > Gecko 201 drive.
> >
> > With an ohm meter and a D size battery I determined which set of
> > windings are which.
> >
> > A and a lead are I'm assuming one full winding. As the ohmeter
> shows
> > 2.3 ohms across it. If I take either a or A lead to common I get
> > half the resistance. Hence, half the winding. I connected A to
> phase
> > A and a to phase B on the Gecko. Same with the other set of
> > windings. B to phase C and b to phase D.
> >
> > Have 34 volts DC coming in. Power light comes on and nothing. No
> > smoke no pop no motion. I don't know if I have the step and dir
> pins
> > called out properly in the software. I'm checking that now,

thought

> > that may enable it somehow.
> >
> > Any input on this would be most appreciated.
> >
> > Hope I didn't blow this thing...
> >
> > Thanks, Ron
> >
>
>
>
>
>
>
>
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