RE: [CAD_CAM_EDM_DRO] Long cables for Gecko G340s

I have been poking at the same problem. I started with shielded cables
on the encoders with the shields tied to the ground terminal of each
drive. I had problems with extra/missing steps and sudden pauses and
lurches. I then added the suggested caps to the encoder. Possible slight
improvements. I then figured I would hook the shields up correctly by
connecting all of them to the negative terminal of the power supply
filter cap. That was a failure. The drives would not enable most of the
time and when one of them did it would fault immediately. I then
disconnected the shields from everything and that is working so far the
best. The shields are not connected on the motor/encoder end.

I am planning to put in differential drivers and recievers and see if
that totally clears up the problem. I haven't yet tried grounding the
motor case. So far my experience is matching Tom's so it may be an
improvement.

Tim
[Denver, CO]

> -----Original Message-----
> Turned out I needed longer cables for one of the axes of my flame
> burning conversion and I am running into Tom Eldregdes problems as
> covered in this and other posts.
>
> http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/message/27064
>
> I am confused about what I need to get this running properly.
>
> Can anyone summarize what is needed. The posts mention:
> 1. Ground the motor shield at the case.
> 2. Add a small capacitor to the encoder?
> 3. Don't ground the enconder shield?
>
> Thanks in advance for any help.
>
> Andy
>
>
> Addresses:
> FAQ: http://www.ktmarketing.com/faq.html
> FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/