Re: [CAD_CAM_EDM_DRO] stepper problem

andrewyslee wrote:

> Hi,
>
> A friend tried to post this question but never made it. Hoping that
> someone can point out the most likely cause of this little problem of
> steppers moving only one direction.
>
> He has one 2-axis driver box with G201 which only move in the positve
> x and y direction. When commanded to move in the negative direction,
> the motors only emit a tingling sound, no movement. To eliminate the
> possibility of the step&direction signals being the culprit, the
> lathe was connected to another driver box (g201's) and movement was
> smooth both ways - positive as well as negative.
>
> What is the most likely cause with the problem driver box?

One possiblity is that the step and direction signals have been switched,
so you have step output going to direction in, and direction out going to
step in. So, check out the cable wiring between the parallel port and the
G201 drivers. Another possibility is the way the ground terminals are
connected from the parallel port to the +5 V supply in the driver box,
if it is set up that way.

Jon