Re: gecko burned again

I now have 3 separate 10 amp slow blow fuses, one leading to the
power input on each drive. The motors are rated at 7 amps. Is that
the correct fuse to be using?

Thanks,
Keith

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "john labutski" <kd6wd@c...>
wrote:

> Jon
> You have an excellent point. Keith could probably test this with a

new

> Gecko. He should just add the correct amp fuses to the motor

drive lines.

> When one fuse pops he will probably find you are correct.
>
> Your comments also bring up another great point to consider .

Fuses and

> fuse holders are cheap compared to driver boards as well as

computers. I've

> been a ham radio operator for a long time and over the years fuses

have

> saved me thousands of dollars worth of equipment when a power

supply or a

> transformer went south on me. Old "Buss" and me are great buddies.
>
> John
> ----- Original Message -----
> From: "Jon Elson" <elson@p...>
> To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> Sent: Sunday, November 07, 2004 1:26 PM
> Subject: Re: [CAD_CAM_EDM_DRO] gecko burned again
>
>
> >
> > Keith Clark wrote:
> >
> > >Well, the y axis gecko drive burned again this morning. This

time

> > >there are no loose wires. I was doing very little with the

machine

> > >and had just turned it on when during a y axis G0 move, the

drive

> > >burned up. I assume this is an indication that the Gecko cannot
> > >handle the motor I am using. This is an old topic and I have

asked

> > >for help with this problem before. The mill is a Bridgeport

Series

> > >1 CNC originally controlled by Boss 6 but now using Anaheim

Nema 42

> > >high torque stepper motors and Mach2 software with a Campbell
> > >breakout board.
> > >
> > >At this point is seems reasonable to try another brand drive?
> > >
> > >
> > I think you need to retire that MOTOR. There is nothing wrong

with

> > the Gecko drive, when used with good motors. But, one of its

weaknesses

> > is that shorts to ground, or just plain internal shorts in the

motor

> > windings
> > will pop transistors in the Gecko drive. I think you'll find

the Rutex,

> > Xylotex,
> > etc. drives all have this same weakness. After blowing TWO

Geckos on

> > the SAME motor, doesn't that tell you something? Why didn't the

X or Z

> > drivers blow? Why always the Y axis?
> >
> > Explanation: Your Y motor has an intermittent short. How much

you are

> > doing with it doesn't make much difference. I assume the motors

heat

> > up, even when idling. The heat probably causes the short to

develop

> > every once in a while, when the winding expands from the heat.
> >
> > Jon
> >
> >
> >
> > Addresses:
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