Re: Trigger Gap Safety

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Metlicka Marc by way of Terry Fritz <twftesla-at-qwest-dot-net>" <mystuffs-at-orwell-dot-net>

ted,
i don't know if so much pessimism is need here, i have adjusted my
dimmer while the coil is running, after all, isn't that the idea?
CAN the hv spike get back through the limiting capacitor? if in doubt,
can't the case of the dimmer be grounded?
isn't this the same freak danger of adjusting a srsg on the fly with the
inductor\capacitor phase adjuster?
personally i believe that if the case of the auto coil is grounded and
the metal case of the dimmer is grounded with the supplied ground lead,
and the button is the only thing that is touched, i don't see much more
danger the coiling itself? you definitely do NOT want strangers
adjusting the phasing of the dimmer, but because the safety gaps will
fire madly, not because of the danger of life and limb. in all actuality
to safety, no one but you should have access to the controls other then
the "E-stop", am i not right?
i would worry about charged capacitors and primary strikes more the i
worry about kickback spikes, i've been using the triggered gap for
several months now and have yet seen any line problems.
of coarse a line filter could go in the leads from the dimmer to the
coil if in doubt. provide a path to ground that looks better then flesh
and bone and you will be safe.
does anyone know what the actual output voltage of a 12v auto coil
running on 120v would be?
has any coin crusher operators ever seen a hv kickback into the trigger
circuit? there are many, many, many more joules at hand in this
application, but it seems the hv would rather travel to and through the
primary then into the trigger circuit, maybe i'll setup a filter and
remove one primary lead to see how much damage is done by this?
i will be sending terry a triggered gap setup very soon, and knowing
terry as we all do, he will give us a very detailed page of test
results.
these are just MY opinions and i think all coilers should go by there
gut feeling on this, if scared or nervous, don't try it!
marc m.
geek #1055


Tesla list wrote:
> 
> Original poster: "Ted Rosenberg by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <Ted.Rosenberg-at-radioshack-dot-com>
> 
> marc, mike, and group:
> To remote or not to remote, that seems to be the question.
> IF the dimmer, on/off switch is mounted in an AC box for convenience and
> brought remote from the main coil base by means of a suitable line cord,
> then I can bet that someone will attempt adjustments while the coil is
> operating. And as we have discussed so far, we can't guarantee, 100%, that
> such a remote box will be joule free.
> 
> Well, duh, the easiest solution is to place that control inside or mounted
> within the base cabinet assembly of the coil. THEN we can be sure we wont
> adjust it while the coil is ON, will we???
> Do we adjust SRSG's "at the motor" while the coil is running? <only once!>
> Sorta the same rule applies, IMHO.
> One starts the trigger circuit, backs off and energizes the coil. If
> adjustments are needed, 1. turn off the coil  2. turn off the coil...then
> make the adjustments.
> 
> Safety <ouch> First
> 
> Ted
> 
> =========================================
> Subject: Re: Triggered gap and safety gaps
> 
> Original poster: "Metlicka Marc by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <mystuffs-at-orwell-dot-net>
> 
> mike,
> i have used the coil\dimmer circuit for quite a while now and i haven't
> noticed any kind of kickback from this circuit?
> some things i have tried is put two wraps of each mains lead through a
> ferrite toroid and one turn of the hv trigger lead around a flyback
> core, whether it helps?
> if you're worried about the mains, i haven't seen any problems myself.
> maybe as more coilers try it, more info will come in?
> if you don't feel secure in using it, please don't, safety relies on
> sureness.
> marc
> 
> Tesla list wrote:
> >
> > Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <CHURCHMON-at-aol-dot-com>
> >
> > Hi Johnathon and list ,
> > I too am concerned that if I build one of these triggered gaps that I
> could
> > get back
> > lash from the tank circuit if I come in contact with the dimmer knob.
> > Has any one else experienced any from these type of trigger circuits ?
> >
> > Thanks ,
> > Mike Church(CHURCHMON)-at-aol