Re: [CAD_CAM_EDM_DRO] Compumotor Plus stepper drive

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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