Re: [TCML] rsg pulsing

[bunnykiller <bunnikillr@xxxxxxx>]

Hey John...

took a look at the pictures....
you may want to consider lessening the amount of wire used to hook 
things up...  try to consolidate the parts closer to the 
primary/secondary setup...

Scot D



John Forcina wrote:

> Ok sure.  Here are some specs.  power suply 4 mot's around 8.4kv at 4.8kw.
> primary cap 88nf 24kvdc cde 942c16p33k caps.  THe nameplate speed on the
> motor is 1800 rpm so i may not be running it at exactly 1800 rpm.  Here is a
> pic of how the rsg is set up.
> http://flickr.com/photos/25967047@N07/2778479246/sizes/l/  Here is a pic of
> my whole setup.  The orange thing attached to the left side of the variac
> box is the dc motor controller.
> http://flickr.com/photos/25967047@N07/2777622579/sizes/l/  I hope this
> helps.
>
> On Thu, Sep 18, 2008 at 10:02 PM, bartb <bartb@xxxxxxxxxxxxxxxx> wrote:
>
>  
>
> > Hi John,
> >
> > I just got back on emails tonight after a day or two outage, so I'm
> > probably late on my reply (ignore if you've found the problem).
> >
> > I find pulsing odd in your case. This is likely a simple asynchronous
> > rotary? I realize you specified 1800 rpm, but I assume that is just a rated
> > rpm for the DC motor? Can you give cap size, power source (MOT's?), and gap
> > electrode arrangement and spacing? Also, is it a constant pulse or
> > intermittent? I'm probably not much help with this as I've never encountered
> > a problem like this with a rotary, but I wonder if the MOT's are affecting
> > the motor on the mains circuit. You mentioned 30% on the variac and both
> > coil and rotary pulse. So I'm wondering if it pulsed at less voltage. I
> > expect it pulsed right when the coil began operating (but wanted to be
> > sure).
> >
> > Take care,
> > Bart
> >
> > John Forcina wrote:
> >
> >    
> >
> > > Ok tonight i took my big coil out for a run since i havent really got a
> > > chance to tune it yet.  I noticed that as soon as i got it to 30% or
> > > higher
> > > on the variac the spark gap and coil started pulsing really bad. it would
> > > shoot 6' streamers for about 1/2 second and then stop for about 1/2
> > > second.
> > > The rsg is a dc 1800rpm 240bps.  I still have no pfc so that may be a
> > > problem.  Anyway why is this doing this?  Any tips or suggestions would be
> > > greatly appreciated.
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