Re: [CAD_CAM_EDM_DRO] blowing fuses

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