Argh. Turns out the drawing doesn't match what I actually implemented, I just checked it out. Actually the Relay Coil is NOT connected through the PTO coil, as I drew, but directly to the 20A controls fuse. I've updated the drawing on Electrak.com and attached it here. Ralph, thanks for questioning me. I like your time-delay circuit and other ideas as well; someday... Joel ----- Original Message ----- From: "Ralph G Vogan" <ralphgv CenturyTel net> To: "Archive, Elec-Trak" <elec-trak cosmos phy tufts edu> Sent: Saturday, February 05, 2005 2:12 PM Subject: Re: (ET) Alltrax-PTO-rtn-to-off > Lets see, if I follow the circuit below correctly. 36 v + goes thru the > Seat & Key Switches - When the PTO Latch Switch is on nothing can > happen. When you turn on the PTO Momentary Switch on the Relay Coil is > activated. The Relay Coil is connected to the negative battery thru the > PTO Coil? (Not a good place to find negative battery as it doesn't stay > negative very long). When the Relay coil comes on contacts n-o 1 and > n-o 2 turn on applying 36 v + to both sides of Relay Coil and it will > turn back off turning off the PTO Coil also. Also my E20 did not have a > momentary contact on the PTO Switch. My ET Web page diagrams show how I > control the PTO Contactor thru a relay. It will not shut down the PTO > if I bounce on the seat but it will shut it down if I get off the seat & > before I can get a hand or foot under the mower deck. It also starts it > back up when I get back on the seat automatically. > > Ralph V > ralphgv centurytel net <mailto:ralphgv centurytel net> > ET Web page > http://ralphgv.tripod.com/ > > >----- Original Message ----- > > > > > > > >>>- I wish the schematic showed how to use one of the low-current > >>>relays, > >>>the key+seat switched source, and the "momentary" position of the PTO > >>>switch to reproduce the original "return-to-off" feature of the PTO. > >>>I > >>>had to figure it out, and I got a minor detail wrong the first time > >>>around. (Couldn't turn it off once I turned it on!) Anybody that wants > >>>to know how I did that (the right way), just let me know and I'll come > >>> > >>> > >up > > > > > >>>with a drawing of how I did it. > >>> > >>>In short, I am so happy with the way the conversion turned out. The > >>>floorboard-mounted pedal and linkage to the pot-box (see > >>>http://www.elec-trak.com/gallery/browseimages.php?c=21) gives me foot > >>>control of speed so I can use my hands to steer and rotate the > >>> > >>> > >snowblower > > > > > >>>chute and operate the lift. The reverse switch is mounted where the > >>>dash-mount speed control came out. > >>> > >>> > > > > > > > > > > ------------------------------------------------------------------------ > > > >------------------------------------------------------------------------ > > > >_______________________________________________ > >Elec-trak mailing list > >Elec-trak cosmos phy tufts edu > >https://cosmos.phy.tufts.edu/mailman/listinfo/elec-trak > > > > > > _______________________________________________ > Elec-trak mailing list > Elec-trak cosmos phy tufts edu > https://cosmos.phy.tufts.edu/mailman/listinfo/elec-trak
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