Re: Ballast Resistance For Pig Coils (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- 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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