Re: Agilent Encoder Pull-up resistor

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Jon Elson <elson@...> wrote:

>
> afogassa wrote:
>
> >
> > Rutex new drives needs differential encoders if the distance

from

> >pcb to the motor is over 1 foot or so, rutex has a pcb that
> >converters the signal from incremental encoders to differential

it's

> >about 20Us$ or so.
> > After installing the converter don't use pullup resistors.
> >I'm using rutex drives and it's very good, little hard to tune it
> >with software, I like the old ones with pots to set it up.
> >
> >
> >
> Oh, wonderful! They must be doing something really "SPECIAL" in

their

> drives
> to require this. I have several installations with 30 FEET of

encoder

> cable that
> work perfectly with single-ended encoders. So, I'm glad I don't

use

> Rutex drives.
>
> Jon
>

Hi Jon,
I'm using rutex drives from their very first drives. the first ones
that came up would not keep track of high encoder ticks at over 2000
rpm. but was less sensetive to noise. I still have one that works
with a 270 ticks incremental encoder(X4= 1080 counts) and the motor
is near a high frequency ac motor coupled to a VFD that runs at 200
hz and the encoder cable runs parallel to the VFD cable and it's
around 15 feet in lenght and I have no problems.
After that I got a R990H, had problems with noise with cables over
a foot or so, got a R516 line driver and it works nice.
Now I have the R2010 drives and R2210 line drives and it's
beautiful working with a 500 counts encoder(x4=2000 ticks).
I can get around 250 in/min rapids, it's what the machine can take.
more than that and the machine starts to walk around the shop when
doing some 3d machining with sharp corners all the time :-).

I've not used Geckos drives so I can not coment on it.
Rutex drives and support is tumbs up ! and works for me.
Now, I don't know what drives you're using, but I would like to know
the specs? such as encoder counts, motor rpm, and if is the only
machine running or do you have welding machines, plasma cutters,
VFDs, working at the same time as you're running your servos?.

Fogassa.