DON'T! was Re: Power Supplies for Geckos

Hello,

Don't take this advice, unless you are VERY experienced, AND are
willing to risk your life...

Using a variable transformer/variac exposes you and your circuit to
the 110 or 220 mains!

These provide no isolation from the A/C; which means if something
goes wrong you will be hit with as much current as the wires can pass!

This has been discussed before. PLEASE use an isolation transformer...

Ballendo


--- In CAD_CAM_EDM_DRO@yahoogroups.com, "azsigns2000 <azsigns@s...>"
<azsigns@s...> wrote:

> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "machinist24540 <ace@d...>"
> <ace@d...> wrote:
> > Hello,
> > I am upgrading my BOSS 3 with 210 Geckos.
> > I plan to use the origional steppers.
> > The power supply is messed up. (I replaced all the bridge
> rectifiers
> > but to no avail.)
> > I was looking for power supplies but am not sure what to get.
> > I found some 65 V 15 Amp from TTI for $300 ea.
> > Any other suggestions?
> > Thanks,
> > John
>
> On several machines I've used variable transformers. You can find
> them on Ebay for $25-$80. Just add a rectifier & 1000mfd/amp in
> capacitors and your ready to go.
>
> As a bonus you can "fine tune" the supply voltage to anything you
> like within your motors ratings.
>
> For larger supplies I've also used 3 phase ganged variacs & rewired
> each phase for a different axis. This way each axis has it's own
> independant power supply.
>
> Add a cooling fan to the variac and you could push it's ratings a
> little higher.
>
> Chris