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Re: Ballast Resistance For Pig Coils (fwd)



---------- Forwarded message ----------
Date: Sat, 27 Oct 2007 08:02:57 -0700 (PDT)
From: Yurtle Turtle <yurtle_t@xxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: Ballast Resistance For Pig Coils (fwd)

Wouldn't 150 mH limit you to around 5 amps? I'm having
problems at 25 amps, but had no problems below that. I
would like to get to 50 by Halloween. How did you
determine .5 ohms, math or trial and error?

thanks
Adam
--- Tesla list <tesla@xxxxxxxxxx> wrote:

> 
> ---------- Forwarded message ----------
> Date: Fri, 26 Oct 2007 23:49:11 -0600
> From: resonance <resonance@xxxxxxxxxxxx>
> To: Tesla list <tesla@xxxxxxxxxx>
> Subject: Re: Ballast Resistance For Pig Coils (fwd)
> 
> 
> 
> Usully 150 mH does a good job.  Sometimes we add a
> 0.5 Ohm 12 kiloWatt 
> resistor in series.  Then it is very very smooth
> with no thumps ever.
> 
> Dr. Resonance
> 
> Resonance Research Corp.
> www.resonanceresearch.com
> 
> 
> ----- Original Message ----- 
> From: "Tesla list" <tesla@xxxxxxxxxx>
> To: <tesla@xxxxxxxxxx>
> Sent: Friday, October 26, 2007 9:35 PM
> Subject: Ballast Resistance For Pig Coils (fwd)
> 
> 
> >
> > ---------- Forwarded message ----------
> > Date: Fri, 26 Oct 2007 17:41:37 -0700 (PDT)
> > From: Yurtle Turtle <yurtle_t@xxxxxxxxx>
> > To: tesla@xxxxxxxxxx
> > Subject: Ballast Resistance For Pig Coils
> >
> > What size resistance are you folks using inline
> with
> > ytour ballast for their pig powered coils to
> prevent
> > "thumping"? I decided to tune up my coil this
> evening
> > in preparation for Halloween. I recently started
> using
> > two slide inductors instead of my welder. This
> evening
> > all was running well, as I slowly cranked up the
> amps.
> > As I got to around 25 amps, the actuator motor
> died on
> > my Powerstat stack. I replaced the fuse, and it
> blew
> > again. I decided to set the voltage, then remove
> the
> > fuse, to keep from risking damage to the stepper
> > controller board. As I continued to run, I heard
> > several hard thumps from my powerstats. I quickly
> > turned up the breakrate, which solved the problem.
> > However, I noticed that the line in to the
> Powerstat
> > actuator had flashed over to the chasis.
> Apparently I
> > am getting some nasty spikes that I hadn't
> experienced
> > with the welder.
> >
> > I know folks have advocated using resistance in
> line
> > with their ballast. Is there a way to calculate
> what
> > resistance is effective at certain configurations,
> or
> > is it more trial and error?
> >
> > The reason I'm concerned is I don't want to blow
> up my
> > Powerstat actuator or my VFD.
> >
> > I have EMI filters between my incoming power and
> my
> > pig/ballast, but maybe I should consider something
> for
> > voltage spikes. While a spark gap for 120/240
> sounds
> > silly, and hard to set, the 120 volt input to my
> > actuator jumped 1/8" to the grounded chasis.
> Without
> > having access to some kind of power monitor, I
> > wouldn't know if MOV's would last for years or
> > seconds.
> >
> >
>
http://www.hot-streamer.com/adam/bigass_coil/schematic.pdf
> >
> > thanks
> > Adam
> >
> > __________________________________________________
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> >
> >
> >
> > 
> 
> 
> 
> 
> 


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