Re: blowing fuses

Hi Alan,

I ran the multi meter across the leads before setting up the unit and
tested the stepper on the bench before putting on the machine.

all seemed fine.

I know the stepper works without a load, and it is a
6 wire unipolar stepper and I did confirm that from the
manufacturers PDF files.

I did not calculate the L/R resistors to limit the current as I
ASSumed it would work well with what I thought was a light load.

and this being my first time implementing a stepper, I'm not sure of
all the necessary steps to take to make sure I didn't make any
mistakes. Guess I need to go back and read more tutorials on how to
use steppers.

Dave

( I voted YES to both poll questiosn, if it has to do with metal
working then I want to know about it.)

--- In CAD_CAM_EDM_DRO@y..., Alan Marconett KM6VV <KM6VV@a...> wrote:
> Hi Dave,
>
> Haven't heard of Chapps, and a simple search didn't find it. URL?
>
> Shorted winding? Is the Vectra stepper a six lead? perhaps a
winding
> is switched. Did you calculate the L/R resistor(s) to limit the
motor
> current?
>
> Probably need more to go on.
>
> Alan KM6VV
>
>
> dave_ace_me wrote:
> >
> > Hi all,
> >
> > I installed a NEMA 23 stepper on my drill press and put on a
timing
> > belt. I am using a 60 tooth large gear and a 16 tooth drive gear.
> > 3.75: 1 drive ratio.
> >
> > The VEXTA stepper is 5.4 volts, 1.5 amps. Unipolar.
> >
> > Tried to take 100 steps as a test.
> >
> > No movement, then pop, blew the 4 amp fuse on the power supply.
> >
> > After the second fuse blew, I figured I better refer to a higher
> > authority.
> >
> > I know I did something wrong, but I'm not sure what.
> >
> > I was using a Chapps, serial port stepper controller as the
stepper
> > controller.
> >
> > Any ideas ?
> > Need more information ?
> >
> > Dave