Re: Gecko burned out

I'm not sure about "tinned" small stranded wire, but this is a known
issue with aluminum building wire. Until they figured out how to
fabricate connectors with set screws which were acceptable, you had
to use a compression terminal (10,000 pound/sq. inch hyraulic cripper
used) to attach a lug or a coupling with a copper pig tail to go
on/in the switch and panel connectors. Over the years the aluminum
would "flow" in a mechanical connector and become loose (I think
because the coefficiant of expansion was different between the
aluminum and a copper connector). In a CNC controller this
loostening would cause some sparks and smoke. In the main electrical
service for an office building, the sparks are bigger and you get
more smoke :-)

Jeff

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Andy Wander <awander@v...>
wrote:

> Gotcha.
>
> BTW, did you know that tinning stranded wires is NOT recommended for
> wire-clamp-type terminals? The manufacturers specifically warn

against it.

> They say it will cause the connection to creep and loosen.
>
> I still don't believe it by my "gut feeling", but I would guess

they know

> what they are talking about.
>
> Andy Wander
> Verrex Corporation
>
>
> -----Original Message-----
> From: JanRwl@A... [mailto:JanRwl@A...]
> Sent: Monday, October 18, 2004 2:17 AM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: Re: [CAD_CAM_EDM_DRO] Re: Gecko burned out
>
>
>
> In a message dated 10/17/2004 6:47:15 PM Central Standard Time,
> awander@v... writes:
>
> Are you saying that Geckos should have the safety circuitry built

in, or

> that the users should be more careful when they wire them up?
>
>
>
> The latter.
>
> The G204 will have features which I understand will make them

(more)

> idiot-proof, but they will COST more. Understandable. I think I
> understand that
> the G201 and G210 will still be available for the old pricing. If

so,

> good.
> I read instructions, tin stranded wire-ends, tighten screw-

terminations

> properly, use correct DC supplies, regulated or not, and find that

a much

> more
> satisfyingly economical approach than being sloppy and having to

purchase

> replacements every few days.