Re: [CAD_CAM_EDM_DRO] Ways to convert step/direction signals to +/-10V analog

I may be wrong (it happens often) but isn't this a bit of an odd way to do
things?

The +/- 10 V input I thought set the velocity of the servo motor, in each
direction, not the position. You feed your resolver/encoder into a PCL,
which outputs the +/- 10 V to servo amp.. Blah Blah Blah.

How is the direction/step info ever going to be able to provide that
functionality? Unless you build a fairly complex bit of circuitry to do the
resolving/quadrature and output the appropriate analogue voltage, and then
you'd have to develop your own PID and S curves etc.. Too much fiddling
about, and at the end of it you'd have a servo system with discrete steps...
Hmmmm.

Cheers, Chris.

* Design engineer, Assembly worker, Cleaner.
* Ohmark Electronics. PO Box 5302, Christchurch, New Zealand.
* http://www.ohmark.co.nz

----- Original Message -----
From: <cnc002@...>
To: <CAD_CAM_EDM_DRO@egroups.com>
Sent: Friday, September 29, 2000 5:27 AM
Subject: Re: [CAD_CAM_EDM_DRO] Ways to convert step/direction signals to
+/-10V analog


> Hello group:
>
> I am looking for a relatively inexpensive way to convert step/direction
> signals from a PC parallel port to the +/- 10Vdc analog needed to control
a
> servor motor amplifier. I know that Gecko drives has a servo driver that
> will do this and I have a couple ordered. The scenario I have is this:
The
> machines already have the servo amplifiers and motors on them and the
motors
> are much larger than the maximum allowed by the Gecko drives. There is a
PC
> system with a G-code interpreter on it that outputs step/direction signals
> via the printer port, I need to use this to drive the servos.
>
> Any help will be appreciated. I hate to purchase all new amplifiers that
> will accept the step/direction signals if there is another, less expensive
> way to do this.
>
> Randy A.
>
>
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