RE: [CAD_CAM_EDM_DRO] Re: rough motor

If you still have the instruction manual try the swing test. Connect a
voltmeter to the terminal A-a , then using a program like deskncfor dos
set in the jog mode issue one step at a time. You should see the output
go from +18 then after the next step depending on if you have it in the
half step mode it should go to 0 then after another step is sent it will
go to -18 ( assuming that you have a 18V power supply on the motor side.
If this is ok then try B-b and repeat. If it works and you see the swing
then the drivers are ok andn you have a problem with your stepper motor
or connections to the stepper motor. If A-a works ok but B-b doesn't
then the L298 is burn out.
Dan

-----Original Message-----
From: keongsan [mailto:keongsan@...]
Sent: Monday, May 06, 2002 12:17 AM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] Re: rough motor

--- In CAD_CAM_EDM_DRO@y..., "mariss92705" <mariss92705@y...> wrote:
> Hi,
>
> What you are describing sounds to me like a motor drive that has
one
> phase burned out. The motor moves 2 full steps, then jumps back at
> very low speed. You may have to replace the transistors on the bad
> phase.

> Mariss

Checking the board by measuring Vref for setting the current. With no
stepping, Vref was 0.25, then when the command to move was given,
Vref increased to 0.50. I believe this shows that the logic part of
the board was OK. (BTW it would be nice if the geckos have this
feature for testing)

How does one check the motor part now?

Thanks a trillion

keongsan


> --- In CAD_CAM_EDM_DRO@y..., "keongsan" <keongsan@y...> wrote:
> > Hi all,
> >
> > What could be the cause of motors which vibrates/move in a
manner.
> > The motor was moving smoothly 2 weeks ago with the camtronics
board
> > and desknc for dos? Now when I try it out again, the motor (on
the
> > bench) seem to just vibrate roughly without appparently moving
> > anywhere, irrespective of feed rate. What should I look out for?
> >
> > Thanks in advance
> >
> > keongsan


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