Re: Power supplies ( blown Gecko)

Hi Todd,

I am not sure how I blew the Gecko.

I was eager to get things running, put a 470uF on the inputs, used
the correct resistor, wired up the motor and started running the
machine.

after a few timing runs and changing ramp and full speed to see what
it would do.... ka-BLEWie ! POP and the cap kinda leaked, the cap
opened up, it didn't pop or explode. It was connected properly.

I blew the 10A fuse on the 110VAC power supply. and the 10A on the
Gecko input. I didn't look at the fuses before I powered up to get
the proper sizes.

The large resistor on the right side of the Gecko, blew half the side
off.

I didn't find what the cause was, and a direct replacement was
installed and it has been running fine ever since. Of course, I put
in the correct size fuses and double checked all the wiring.

I didn't have the wire shield grounded on either end and the length
was about 8 feet. the Gecko was set for about 1.5 amps.

Since it was a 201 Rev A, and I bought at the closeout prices, I
chaulked it up to the gremlins in the machine.

I offered to send it back to the factory for their forensic review,
boxed it and then we cleaned the basement/shop and put the box
somewhere ???

The Steppers were Vexta, NEMA23, dbl stack, used off E-bay and it
still runs fine.

I assume that in my haste, I might have let a stray strand of wire
hit something, but if it started the whole mess, it blew off, never
to be seen again. A bug could have landed on some terminals or who
knows what ? I didn't get a chance to cut metal at that point.

Dave











--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Todd Fleming" <todd@f...>
wrote:

> > Seems like a good idea! if the wife kicks you out, you can take

the

> > good stuff first !
>
> Thanks! I'll have to find a wife before she can kick me out

though...

>
> > question is are they all aluminum ? all metal offers shielding.
>
> yep.
>
> > and, if you want, your local computer guy probably tosses dozens

of

> > boxes a week. offer to help him clean up one day and he'll

probably

> > give you a dozen if you promise not to fill his dumpster.
>
> Good idea also. I have a spare desktop case that I was going to use

before I

> found the tool cases. The desktop case has large holes where I

don't need

> them.
>
> > btw, the photos section shows my box as I was building it.
> > photos-daves stuff
>
> Is it "Daves Unit?" How did you blow your Gecko?
>
> > Dave
>
> Todd Fleming