Re: [CAD_CAM_EDM_DRO] Re: I let the smoke out... motors

On Sun, 14 Sep 2003 02:02:10 -0400, you wrote:

>On Sunday 14 September 2003 01:57 am, turbulatordude spake:
>
>> The questions for the mop-up operations are....
>>
>> did you blow any caps ?
>
>It does not appear so...
>
>> second question, is there any scorch/burn/carbon on the Geckos ?
>
>Again, it does not *APPEAR* so...
>
>I've been web searching all night, and have found
>out that the NTE331 is indeed a Power Regulator/Switch.
>I'm lame, but I think I figured out what happened.
>
>Tell me what you think -
>
>In wiring the motors incorrectly, I caused a condition where they were
>constantly pulling from the power supply, causing an overload of the
>regulator, making it blow up quite impressively.
>(loud, bright, and blew the heat sink right off it)

That sounds like a combination of both high voltage and high current.
You might try running your motors on a low voltage to see if they're
still ok. but that kind of reaction almost indicates a short to
ground somewhere, and no current limiting (which, guessing on the
regulator design, there isn't). I'd check for shorts from the
regulator output to ground, since that is likely to be a definite
problem. ALL the electrolytic capacitors must be wired properly in
terms of polarity, and should be about 20% (rule of thumb) higher
voltage rated than the maximum you'd expect.

That it blew without the motors indicates that there's probably a
short somewhere.. You might want to check the polarities to make sure
that they're OK as well.

Harvey

>
>Thoughts?
>
>Weyland
>