Re: blown Gecko - shorted output ?

Hi Dave,
Just an suggestion: You might also suspect the insulation in the
stepper. Maybe a coil is somehow shorting to gound during operation
or vibration. Are they new or old steppers. If the Stepper has a
ground wire or appears to have one, disconnect it, the metal case
should be enough.

Also test to see if you house wiring is really grounded correctly.
You should get 0vac from the ground to the wider prong on the
outlet, and 110VAC from the ground to the narrower prong on
the outlet.

-Lee






--- In CAD_CAM_EDM_DRO@yahoogroups.com, "turbulatordude
<davemucha@j...>" <davemucha@j...> wrote:

> I bench tested a stepper, worked great. mounted it on the machine
> and pop. blew something in the Gecko. Mariss said it might be the
> outputs but only testing will reveal the answers.
>
> so my question is of isolation. does the Gecko frame need to be
> isolated from the power supply ? from the 110VAC earth ground ?
>
> what irks me is that one axis has been solid for the duration, runs
> perfectly. the other had 'eaten' 4 Gecko's. as you can imagine

I'm

> not excited to just throw on another Gecko to see what happens.
> What bothers me is that I ran all weekend with no problems. 2 I

blew

> on setting up. I assumed that I did something stupid, but now that

I

> blew up another 2 with everything I knew to test, tested, I am
> nervious.
>
> HELP !!!
>
> Dave