Re: stepper problem

Jon Elson <elson@p...> wrote:

> andrewyslee wrote:
> > x and y direction. When commanded to move in the negative

direction,

> > the motors only emit a tingling sound, no movement.

> 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.

What are the symtoms of a driver having step and direction signals
switched? Suppose the driver is commanded to move 10 pulse clockwise.
So we have 10 pulses wrongly going to the direction terminal while
the step signal will be, say, +5V constant. This may explain
the "tingling" sound plus no motion?

Now suppose the driver is now commanded to move 10 steps counter-
clockwise. Now the step signal will be 0 volt while we still have 10
pulses wrongly sent to the direction terminals of the Geckos.
Theoretically, we'll still have no motion plus perhaps
still "tingling" sound from the stepper?

This would be different from the symtoms described (1-way motion)?

> 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.

terminal 10 - pin 1 - +5V source on DeskNC for windows pulse generator
terminal 9 - pin 2 - step termianl " " "
terminal 8 - pin 3 - direction terminal " " "
etc. etc.