Re: Automatically powering 220V dust vac when 220V saw starts

Dan wrote:
"ehsjr" <ehsjr@xxxxxxxxxxxxxxxx> wrote in message news:kSuYi.6325$Cc.1092@xxxxxxxxxxx

Dan wrote:

"ehsjr" <ehsjr@xxxxxxxxxxxxxxxx> wrote in message

Ok. For push and release for on, and push and release for
off, you need additional circuitry. Since you seem comfortable
using relays, we'll stick with them.


Thanks for the reply. I see what you mean, using RC circuits to time the relays. I'm not averse to a solid state solitution, if it would be more straight forward. I actually studied all this 20-odd years, and I've built a ton of stuff, etching circuit boards, etc., just don't remember any of it, unfortunately...

Dan



Ok. You can hack a 120V GFCI and trigger it with the
240 volts saw, provided your 240 volt branch circuit
includes the neutral. (The GFCI needs 120V to operate.)
The GFCI will operate a relay that operates the vac - no
need for the R/C remote.

Or you can use a CT (current transformer) feeding a
resistor, rectifier and filter cap to make a DC voltage
that is fed to an opto-coupler. The output side of
the coupler can operate a relay (with cap in parallel
for your turn-off delay) that operates the vac - again,
no need for the R/C stuff.

So - do you have a neutral? If so I can post the
schematic for the GFCI modification.

Ed
kludge.
.

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