Re: [CAD_CAM_EDM_DRO] Re: Mariss' power supply circuit

Good idea!

I could even take power from the wild leg and another leg of my generated 3
phase.
But I should mention that the 240v here is not too bad... we just have an
argument
about the quality of the neutral line from the transformer to the box.
120v sometimes rises to nearly 240v on the side that has the heaviest load.
I am real unhappy about it since I measured the
float on the power company neutral BEFORE my meter.
It is a long run with several
aluminum crimps.

But I will save this for sci.engineering.electrical.
Les
Leslie Watts
L M Watts Furniture
Tiger, Georgia USA
http://www.rabun.net/~leswatts/wattsfurniturewp.html
engineering page:
http://www.rabun.net/~leswatts/shop.html

----- Original Message -----
From: "Keith Bowers" <kabowers@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Wednesday, June 19, 2002 5:46 PM
Subject: Re: [CAD_CAM_EDM_DRO] Re: Mariss' power supply circuit


> At the risk of being old fashioned you might consider isolating yourself
> from the AC mains using a motor-generator (MG) setup. Moderately severe
over
> voltage would not be a problem to an MG set. They also tend to eat spikes
> and short dropouts. Add a big flywheel and you can ride out all sorts of
> nastiness <G>. IIRC at one time MGs and LARGE flywheels were the core of
the
> emergency power for Cheyenne Mountain.
>
> ----- Original Message -----
> From: "Les Watts" <leswatts@...>
> To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> Sent: Wednesday, June 19, 2002 4:46 PM
> Subject: Re: [CAD_CAM_EDM_DRO] Re: Mariss' power supply circuit
>
>
> > Yes that sounds about right. I figure peak current is determined
> > by either armature saturation or magnet coercivity and has a safety
> > factor. I don't think it's thermal because the time is so short.
> >
> > A high line voltage perhaps causing an amp failure and a motor over rev
> > would seem to be one condition where a braking resistor would be
> > preferable to shorting the windings though... then the regeneration
> > current could exceed max locked rotor. My floating neutral can
> > (and quite possibly will) do that. I need a diesel generator or
something.
> > I may just end up running the computer and servo amps off of 240vac.
> >
> > Les
> >
> >
> > Leslie Watts
> > L M Watts Furniture
> > Tiger, Georgia USA
> > http://www.rabun.net/~leswatts/wattsfurniturewp.html
> > engineering page:
> > http://www.rabun.net/~leswatts/shop.html
>
>
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