Re: [CAD_CAM_EDM_DRO] Motor Noise?

Alan,
where can I get it? Do you have the IBSN no.?
My book from studies never arrived in Costa Rica. (some 500Kg)
The environment in deed is rough. And on top as an i - dot we have a lot of dust
that enters everywhere.
Sven Peter

Alan Marconett KM6VV wrote:

> Hi Sven,
>
> Sorry, I didn't to "loose" you in my comments. Since you are working
> with what is basically an "HF" transmitter, then I'd suggest checking
> out "transmitter shielding", again, it's in the A.R.R.L handbook (for
> ham radio).
>
> That sounds like a pretty rough environment for a PLC! Shielded boxes,
> with feed-throughs for power and control lines are probably in order.
>
> Alan KM6VV
>
> "Sven Peter, TAD S.A." wrote:
> >
> > Hello Alan,
> > my ears cling. If at all I understood a forth of your post!
> > Here my application:
> > I have a centrifuge for chrome-colbalt casting that works with
> > pulsed (1,3 to 1,5Mhz) induction current (4500VDC)
> > for to melt the metal.
> > (Brand german Dentaurum, type Megapuls D100)
> > The trouble with it is that the induction sparks and the high humidity
> > in Costa Rica turn this thing, that never fails in Europe into
> > a nerve killing trouble maker. The secretary of that odontologic
> > laboratory calls me: "911"
> > My plan is to use a Siemens LOGO mini-PLC (120VAC, currents in mA area)
> > for control tasks and put together to the main contactor a few solid state relays.
> > These STR will eliminate the damn sparks of the 4KW-transformer
> > and by the way I can supervise all elementary functions.
> > Sven Peter
> >
> > Alan Marconett KM6VV wrote:
> >
> > > Hi Sven,
> > >
> > > Yeah, you need either sintered or ferrite. Oftentimes you can keep RF
> > > out of stuff by getting an old TV deflection yoke, and wrapping turns
> > > around that!
> > >
> > > Lets see, if you're trying to "keep the RF in", then one can usually
> > > turn on a TV or radio, and see what "works" (add a few beads, try a few
> > > toroids). To keep RF out of a circuit is a little tougher. What wires
> > > go into/out of the "box"? DC power lines can be bypassed with caps,
> > > beads/toroid chokes can be added, and then you somehow need to get a
> > > 'scope probe in to see if RF is getting in. A little harder. Perhaps a
> > > bulkhead BNC, with a short wire "probe" antenna INSIDE the box; to
> > > couple out some signal to a 'scope. Check out the "ARRL handbook",
> > > there are chapters on shielding and filtering, and probably some
> > > suggested values of parts.
> > >
> > > If you have the power supply inside the box, then try a CORCOM filter on
> > > the AC leads.
> > >
> > > There should be some data sheets on the Amidon products on the web
> > > sites, these will give you the freq. ranges for the various beads and
> > > toroids. Or call them!
> > >
> > > Hope this helps!
> > >
> > > Alan KM6VV
> > >
> > > "Sven Peter, TAD S.A." wrote:
>
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