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Re: [TCML] Pre-Launch Prep Procedure
Sorry for the late response. Thanks for the comments. Kurt, your startup
procedure pdf is great, thanks.
I need to measure my primary cap to see if it's anywhere near what I
designed it to be, and hence to see if it may be resonating with the NST.
So I've purchased an LCR meter, so should be measuring it this time next
weekend.
The SRSG firing time/position may also be the issue, since my method for
setting it was very crude. I had it hooked up to the NST output (just the
SRSG, nothing else) and was manually adjusting the rotating electrode
clockwise/anticlockwise based on how bright and loud the sparks were. So
this may be way off. Would the output phase of the NST change much by
connecting up the primary cap? If so it probably is way off.
I've just had a look over the archives, and from what I've read I'm pretty
sure that my issue lies with the SRSG firing timing. I came across a post
from Gary Lau saying that he uses 500W halogen bulbs as a dummy load, and
tunes his SRSG for max brightness. I think I'll run with this idea, along
with building a Freau phase adjuster circuit to adjust the phase more
accurately. Do others use the halogen bulb dummy load? Is there anything I
need to be aware of before attempting this?
Clearly the halogen dummy load will experience the full 10kV output of the
NST - so I presume they're capable of withstanding high voltages? Would
this bulb be suitable?
http://www.bltdirect.com/product.php?pid=411&cat=56
Cheers
Mike
On 13 July 2013 15:38, Kurt Schraner <k.schraner@xxxxxxxxxxx> wrote:
> Hi Mike Gray,
>
> Fritz Egli and myself have written a fairly detailed, and practice tested
> "Startup and Tuning of a Classic Static-Sparkgap TC " - guide. It may
> be of some use for you. You can downlad it as a PDF file from:
>
> http://twfpowerelectronics.**com/~kurt/Downloads/Startup_**
> Tuning_SG_TC.pdf<http://twfpowerelectronics.com/~kurt/Downloads/Startup_Tuning_SG_TC.pdf>
>
> Most of it is useful, despite you are with a rotary and not with a static
> sparkgap. It's 3 pages only.
> Regards
>
> Kurt
>
> -----Ursprüngliche Nachricht----- From: Mike Gray
> Sent: Friday, July 12, 2013 7:36 PM
>
> To: Tesla Coil Mailing List
> Subject: [TCML] Pre-Launch Prep Procedure
>
> Hi all. I'm having some trouble sorting out the correct pre-launch
> preparation, specifically the Terry safety gap. What I currently believe to
> be correct is this. In order to set the safety gap to just wider than the
> max arc width the NST can produce, I first of all disconnect everything
> else from the safety gap except for the NST. I then narrow the safety gap
> so that it fires when the NST is fired up. I then gradually widen the gap
> whilst at the same time firing up the NST, looking for the point at which
> the NST can no longer produce an arc between the gaps. When I get there, I
> leave the safety gap in that exact configuration for TC operation.
>
> Trouble is, when I then go to energise the TC itself with everything
> connected up again, the safety gaps fire when I'm at around 50-60% on the
> variac. I can't understand how this happens!
>
> So I thought maybe it's best to set the safety gap width with the rest of
> the TC hooked up rather than in isolation. But then what to do with the
> main gap (SRSG)? I've tried removing just the SRSG, and with the rest of
> the TC hooked up try to set the safety gap width. In this case it started
> to fire less frequently and with louder arcs each time I made it wider, and
> this didn't sound right so I stopped. Thought it best to ask for advice
> before I explode something...!
>
> So what's the best way to set up the safety gap?
>
> Cheers guys.
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