Re: [CAD_CAM_EDM_DRO] Compumotor Plus stepper drive

Darrell: Read my lips! I said that I spent a day pouring through the
manual that is pretty clear that these are stepper drives and are ,in
fact, designed to drive Compumotor steppers with built in
resolvers.Better yet, why don,t you pop into the their web-site and see
for yourself. www.compumotor.com/literature.htm then click on user
guides and then Compumotor Plus user guide.Be advised that they do call
it a " servo system" but read on. A servo system using resolver equipped
stepper motors.A very impressive setup,if you have the right motors.
Thinking about the possibility of putting a stepper motor in place of my
encoder and using it as a resolver. If only I knew how to wire it. Let
me know what you think. Carey

Darrell wrote:

> Stepper motors do not have resolvers. Some servo motors have
> resolvers. That
> driver is for running servos with step and direction signals.
> Darrell
>
> ----- Original Message -----
> From: Carey L. Culpepper <mr.c@...>
> To: <CAD_CAM_EDM_DRO@egroups.com>
> Sent: Saturday, July 01, 2000 7:20 PM
> Subject: [CAD_CAM_EDM_DRO] Compumotor Plus stepper drive
>
>
> > I have spent the whole day trying to get a Compumotor Plus drive to
> run
> > a motor with step-direction inputs. I downloaded the manual and have
>
> > gone through it several times. The drive has a computer on-board
> that
> > sets everything. Everything is set through serial port commands
> > including current rating and microstepping resolution. The problem
> is
> > that the units are designed to be used with motors with built in
> > resolvers.The manual specifies that it will not accept encoder
> input.If
> > the motor gets a pulse, it is expected to turn a step. If it doesn't
> it
> > keeps trying or gives an error message. It operates just like a
> servo
> > motor and is tuned accordingly with a series of switches or through
> the
> > RS232. I have gone through the manual several times trying to find a
>
> > command that would let me run it without the resolver. All I found
> were
> > commands to set the amount of allowable error. So, I shut it down
> and
> > got my screwdriver and had a "look under the hood". Three PCB,s one
> with
> > the computor circuitry,one small board with the display and tuning
> > switches, and the power supply/driver board. I found three jumpers
> > together on the computer PCB.
> > My question is this: Is it possible to run these drives without the
> > resolver input? Anyone familiar with these units. They are very
> > sophisticated. I am impressed. If only I had motors with resolvers.
> > These are made to be run closed loop.
> >
> >
> >
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