Reply by Phil Allison November 10, 20152015-11-10
Sweetie Pinellas wrote:
> > > I am looking for a way to control two SPDT relays configured=20 > in a ground common configuration like in the link below,=20 > which will control the motor in three states. Normally it > would use a SPTT toggle, but I want to have it operate on=20 > momentary spst push button. Push and hold it and motor turns > clockwise, release and it stops, press again an hold it and > motor turns counter-clockwise, and so on.
** DC motors do not take kindly to having the polarity reversed when spinni= ng at high rpm and your proposed set up allows this to happen. Sudden rever= sals cause very large current surges that burns brushes and commutators. Th= e damage is made worse if the motor has any kind of flywheel device attache= d- ie a prop or fan blade. The motor should be made to stop before polarity reversal occurs, which mig= ht involve dynamic braking by applying a short or low resistance across th= e motor's terminals for a sufficient time. .... Phil
Reply by whit3rd November 10, 20152015-11-10
On Monday, November 9, 2015 at 5:56:36 AM UTC-8, Sweetie Pinellas wrote:
> sorta, I want two outputs that flip upon press, but also both be at ground when the button is released.
Buttons (momentary contact switches) have a lot of bounce. You can get around that (use a SPDT button with 'break-before-make' character to set/reset a relay) or rely on slow relays not being responsive to rapid fluctuations. If the output toggles an odd number of times each button press, it'll LOOK like it's working.
Reply by M Philbrook November 9, 20152015-11-09
In article <79822028-ee83-46cf-bae2-22a54cf0e751@googlegroups.com>, 
littleredvette79@gmail.com says...
> > sorta, I want two outputs that flip upon press, but also both be at ground when the button is released.
you can use two latching relays to drive the existing circuit you showed before. One relay loops around to the other using your momentary button and the button needs to be SPDT so that when you press in it will flip one relay, which in turn re-routes the path for the normally closed contact when you release it. This will flip the other relay so that the next time you press this button again, it has to first pass through the second relay which has been switched from the last operation and now activates opposite input to the first relay. When the firt relay switches, it will also switch the second one, too and so on. During this time, you can use these signals to connect the two relays you had before. So in short, you have both a direct function and toggle function. Back in the old days we had rachet relays, you press in and it simply press the stroke arm forward and pushes on a claw to spin to the next position. Releasing the stroke arm put it back in place for the next move. But those are not mechanically reliable, so the use of magnetic latching relays work well in your application. Jamie Jamie
Reply by Tim Wescott November 9, 20152015-11-09
On Mon, 09 Nov 2015 05:56:30 -0800, Sweetie Pinellas wrote:

> sorta, I want two outputs that flip upon press, but also both be at > ground when the button is released.
This would be really easy to do with logic. Are you bound and determined to do it just with relays? Actually, you could use an alternating relay to set direction, and connect power to the motor relays when the button is actually pressed (either through the button directly or through a relay). That should do the trick. -- Tim Wescott Wescott Design Services http://www.wescottdesign.com
Reply by Sweetie Pinellas November 9, 20152015-11-09
sorta, I want two outputs that flip upon press, but also both be at ground when the button is released.
Reply by Jasen Betts November 7, 20152015-11-07
On 2015-11-06, Sweetie Pinellas <littleredvette79@gmail.com> wrote:
> I am looking for a way to control two SPDT relays configured in a ground common configuration like in the link below, which will control the motor in three states. Normally it would use a SPTT toggle, but I want to have it operate on momentary spst push button. Push and hold it and motor turns clockwise, release and it stops, press again an hold it and motor turns counter-clockwise, and so on. > > http://www.electro-tech-online.com/attachments/win-gif.91463/
sounds like you really want an alternating relay, the question now is "buy" or "build". -- \_(&#12484;)_
Reply by Tim Wescott November 7, 20152015-11-07
On Fri, 06 Nov 2015 18:37:45 -0500, M Philbrook wrote:

> In article <zIKdnVpyJvgcq6DLnZ2dnUVZ5vIAAAAA@giganews.com>, > seemywebsite@myfooter.really says... >> >> On Fri, 06 Nov 2015 12:13:37 -0800, Sweetie Pinellas wrote: >> >> > I am looking for a way to control two SPDT relays configured in a >> > ground common configuration like in the link below, which will >> > control the motor in three states. Normally it would use a SPTT >> > toggle, but I want to have it operate on momentary spst push button. >> > Push and hold it and motor turns clockwise, release and it stops, >> > press again an hold it and motor turns counter-clockwise, and so on. >> > >> > http://www.electro-tech-online.com/attachments/win-gif.91463/ >> >> That circuit should work just fine with two pushbuttons -- unless I >> have my head where the sun don't shine, if you should push both buttons >> the motor will stop, just as if you leave both buttons off. > > The poster wants to flip flop it via a single button so each time the > button is pressed it just goes the other way, instead of using two > buttons > > Flip-Flip with Clk. > Jamie
I took "Operate on momentary spst push button" to be a non-native speaker saying "one or many spst push button(s)". If the OP cares, the OP will elucidate. (So, how many relays does it take to make a toggle flip-flop? They should be slow enough that switch bounce isn't an issue.) -- www.wescottdesign.com
Reply by M Philbrook November 6, 20152015-11-06
In article <zIKdnVpyJvgcq6DLnZ2dnUVZ5vIAAAAA@giganews.com>, 
seemywebsite@myfooter.really says...
> > On Fri, 06 Nov 2015 12:13:37 -0800, Sweetie Pinellas wrote: > > > I am looking for a way to control two SPDT relays configured in a ground > > common configuration like in the link below, which will control the > > motor in three states. Normally it would use a SPTT toggle, but I want > > to have it operate on momentary spst push button. Push and hold it and > > motor turns clockwise, release and it stops, press again an hold it and > > motor turns counter-clockwise, and so on. > > > > http://www.electro-tech-online.com/attachments/win-gif.91463/ > > That circuit should work just fine with two pushbuttons -- unless I have > my head where the sun don't shine, if you should push both buttons the > motor will stop, just as if you leave both buttons off.
The poster wants to flip flop it via a single button so each time the button is pressed it just goes the other way, instead of using two buttons Flip-Flip with Clk. Jamie
Reply by Tim Wescott November 6, 20152015-11-06
On Fri, 06 Nov 2015 12:13:37 -0800, Sweetie Pinellas wrote:

> I am looking for a way to control two SPDT relays configured in a ground > common configuration like in the link below, which will control the > motor in three states. Normally it would use a SPTT toggle, but I want > to have it operate on momentary spst push button. Push and hold it and > motor turns clockwise, release and it stops, press again an hold it and > motor turns counter-clockwise, and so on. > > http://www.electro-tech-online.com/attachments/win-gif.91463/
That circuit should work just fine with two pushbuttons -- unless I have my head where the sun don't shine, if you should push both buttons the motor will stop, just as if you leave both buttons off. -- Tim Wescott Wescott Design Services http://www.wescottdesign.com
Reply by M Philbrook November 6, 20152015-11-06
In article <ab44f71b-51b7-4863-86d2-3f83c9195f18@googlegroups.com>, 
littleredvette79@gmail.com says...
> > I am looking for a way to control two SPDT relays configured in a ground common configuration like in the link below, which will control the motor in three states. Normally it would use a SPTT toggle, but I want to have it operate on momentary spst push button. Push and hold it and motor turns clockwise, release and it stops, press again an hold it and motor turns counter-clockwise, and so on. > > http://www.electro-tech-online.com/attachments/win-gif.91463/
Look for flip-flop circuits. Jamie