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Re: EMI filter for 15KVA pig control circuit
Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>
That's an old pic of the controller, but I still use the same filter.
Here is the controller currently: (fast downloads).
The filter is a typical 3-phase filter rated for 250/440 VAC, 30Ax3,
50/60 Hz (a freebee I had lying around). I have L1 and L2 connected
to the first two terminals leaving L3 and N unconnected. My filter is
"not" reverse wired. A few years ago I blew a good 1/2" hole in the
case of a 60A filter. At that time I had the filter reverse wired. It
ran fine for a while, but during a fun-filled spark show (with
myself), it blew up with a bang. I ran without a filter after that
incident for quite a while. A couple years ago, I installed the
filter you see in the pics, except I decided to wire Line and Load
side as designed. I've had no problems so far. As far as your
question "does it work", well, I'm sure it does. But, as far as
transients and whatnot making their way back to the line, I haven't
measured with and without. I'm sure there is plenty of garbage on the
line. I have blown up a sound card on my pc, but that was due to
running very slow high energy pulses (experimenting). Normal 120 bps
and above runs, I've never had any problems with anything in the house.
BTW, note the big 3000W resistor in the old controller pic is no
longer used (series 2.5 ohm for the pig). Next to the filter is a 60A
SquareD contactor controlled by a PLC which is mounted on the inside
of the door on din rail along with a 5A 24VDC power supply and a low
level signal din rail enable relay (no pic of that side of the door).
The contactor removes power in the event of a motor controller error,
enable signal, deadman switch, etc. The thing mounted to the side
above the contractor is the VFD (variable frequency drive, 230VAC
1-phase in, 230VAC 3-phase out). At the top of the controller is the
current ballast and controls for the VFD. Allows me to easily turn a
pot and change motor speeds on demand, direction, etc. It's just fun
to play with. The sparks sound very wicked! Any time you can change
bps quickly on demand, wicked sounds issue from the sparks and gap
similar to a racecar driver reving the engine!
BTW, the deadman switch is a CB Mic. I had it lying around. Since I'm
using the PLC to control various error situations, any old thing
would have worked (low 24 VDC signal).
Tesla list wrote:
Original poster: "Krohns" <mailto:2halice@xxxxxxx><2halice@xxxxxxx>
The following questiions are directed toward Bart Anderson BUT I
will appreciate any and all feedback. Thanks.
I have recently purchased a 15KVA pole pig and am researching the
control system for it. I have a 230 amp adjustable arc welder that
I plan on using for a series ballast and am getting a variac stack
for the voltage control. I am looking for an EMI protection circuit
and saw what looks to be a large EMI filter in the control cabinet
of Bart's 10KVA "The Gate Keeper" Tesla coil
Bart, does what you have work and if so, what are the specs for
it... and what type of EMI filter would you suggest that I use in a
control system for a 15KVA pole pig?
Here is a link to the information plate on my pig:
I am looking forward to all replies and will greatly appreciate all
of the feedback that I receive.
Sincerely, Hal in Tucson
P.S. Just so you know that I have some experience, I have recently
completed and fired my first Tesla coil. It has a 4" secondary,
runs on a 15KV @ 120mA power system and, as of July 5, throws 4'