Re: automation for dust collector

[Marc_F_Hult <MFHult@xxxxxxxxxxxxxxxxxxxxx>]

On 22 Jan 2007 07:43:41 -0800, "Hank" <HankBrandenburg@xxxxxxxxx> wrote in
message  <1169480621.854637.208390@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>:

>
>I am familiar with electronics, including relays and timer circuits,
>and am interested in any sugggestions on how to accompish this task.
>In particular, is there a way to detect when the motor in any of the
>tools starts without having to wire directly into the switch?  Is there
>a way to do this without running additional wiring to all of the tools?
>
>Thanks in advance for any advice/guidance!

Search ebay for "current sensor" and "current transformer".  Pass one
conductor through the middle of the sensor. What to do with the sensor output
depends on the sort of sensor you use. With variable output sensors, you may
be able to detect two different devices uniquely with a single sensor.
Whether you need to run additional wiring depends on how the tools are wired
up.

For one idea, see:
http://cgi.ebay.com/Current-Level-Switch-Relay-Process-Controller-with-CT_W0
QQitemZ120077887073QQihZ002QQcategoryZ105785QQrdZ1QQcmdZViewItem


(I've bought boatloads various sorts of current transducers for a couple of
dollars each and now have too many. More stuff for the upcoming "Porch
Sale".)

HTH ... Marc
Marc_F_Hult
www.ECOntrol.org