Re: stg2 with 6 axes- Grounding problem

[Don Mclane <dmclane-at-u.washington.edu>]

For the encoders on the servo to go card, can you run the encoders from
the card (draw must be less than 1/4 amp)?  Then do not ground the
encoders to the machine frame, ground only back at the stg card.

Also, if your encoders are single ended, be sure you DO NOT ground the
other input pair; leave it open.

Don McLane
Servo To Go, Inc.

On Thu, 17 Oct 2002, Till Franitza wrote:

>
> Hi List!
> Thank you for your Help!
> One thing I found out is that i have lots of problems with grounding my
> components and electromagnetical disturbances. Almost everything can happen
> if the components are badly grounded. Axes running away is a typical
> phenomenon. i have heard that it it greatly  advisory to connect the
> computer housing with the Machine as ground. My drive amplifiers are badly
> grounded, too. All this is very important. i have a big 220V relais near the
> encoder Cables. everytime the relais switches the stg2 counts some steps.
> Sometimes more and sometimes less. Presumably depending on at which position
> of the sinus wave the 220V have been cut. The supply cable of my machine
> also rund exactly past the stg-cables. The stg-cables are flat ribbon cables
> that are of course not shielded at all. I have to fix all this before i care
> about software.
> Regards,
> Till
>
>
> > -----Ursprüngliche Nachricht-----
> > Von: emc-at-nist.gov [emc-at-nist.gov]Im Auftrag von Paul
> > Gesendet: Mittwoch, 16. Oktober 2002 22:52
> > An: Multiple recipients of list
> > Betreff: Re: stg2 with 6 axes
> >
> >
> >
> >
> > Till
> >
> > If you mail me off list a copy of the C file you edited along
> > with the ini
> > file, I'll try it out here. I have an STG2 card I can test it on...
> >
> > BTW I feel the stg driver source is overly complex just to throw out some
> > voltages and read the encoders. Perhaps a simple set of routines
> > need to be
> > written - Something for me to do over the christmas break maybe.
> >
> > Regards, Paul.
> >
> >
> > On Wednesday 16 Oct 2002 4:35 pm, Till Franitza wrote:
> > > I have used STG2.C for my 6 Axis-Machine. First, 4 axes worked
> > and 2 didnt.
> > > I have changed some lines to make all of them work. Now i have sudden
> > > malfunctions. a counter starts to run away. In my tkemc, when
> > the machine
> > > is in estop, axis[1] runs far far away althoug nothing moves in reality.
> > > What can be the cause of this?
> >
> >
>
>
>
>