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Latching Relays - Startup and shutdown switch

R/C Submarine modelers

Postby Marvin Harten » Thu Sep 11, 2003 4:48 pm

Hi-
In a back issue of the SCR, there was a description and drawing of 2 relays set up as latching devices, operated by magnetic switches, to supply and shut off power to the WTC.
Does anyone rember the issue of the SCR or have the drawing?

Thanks
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Postby Ramius-II » Thu Sep 11, 2003 11:28 pm

Hi Marvin:
If you don't find what you're looking for, it's a simple design and I'll be glad to draw it and e-mail it to you. I still can't post pictures here as far as I know. My e-mail is [email]Ramius-ii@earthlink.net.[/email]

Ed :)
Just one more wire!
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Postby Ramius-II » Thu Sep 11, 2003 11:30 pm

There's no reason you could not do it with only one relay!

Ed
Just one more wire!
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Postby KOEZE » Fri Sep 12, 2003 2:47 am

Use a bistabile relais and two reedswitches. Connect the power via one reed switch to one coil of the relais, connect the power via the other reed switch to the other coil.

If a magnet is held close the a reed switch it closes allowing current through. The relais switches. If the magnet is held near the other the relais switches the other way. No need for a relaiscoil to be permenently active.

EJK

PS See Submarine Technology by Norbert Nruggen for more of these solutions.
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you get older because you stop playing.
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Postby Marvin Harten » Fri Sep 12, 2003 6:54 pm

The drawing that I am looking for may be in Vol. 51 or 53 of the SubCommitte Report. If anyone can find the schematic of the 2 relays, I would appreciate hearing from them. Thanks.
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Postby Rockpile » Sat Sep 13, 2003 9:58 pm

:D Look under the artilac by Gizmo.
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Postby JWLaRue » Sun Sep 14, 2003 12:18 pm

Ahhh....that was the just the hint that I needed to help Marvin. I was looking through all the articles, but not the columns!!

Is this the diagram? ???

Image

-Jeff
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Postby raalst » Sun Sep 14, 2003 1:24 pm

just a thought :

the relay is rated for 5 amperes.

so, your motors, speedcontroller, servo's etc.
need to keep their combined consumption below
5 ampere

5 ampere seems a little low to me for larger boats.

be sure to check at least what the startup current
(stall current) of your main motors is.

Regards,
Ronald
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Postby Ramius-II » Mon Sep 15, 2003 11:21 am

Hi Guys:
The schematic is fine and I think you may have missed what KOEZE / EJK was saying. NEC makes an EA2 series of relays that have two coils called "Double Coil Latch Type". Apply power to one coil, the relay connects one set of pins. Apply power to the other coil, it disconnects those pins and connects another set. It's a momentary type coil, but the pins stay connected so you are not drawing any current. with this type you could use your magnet to turn on the sub and when you turn off the sub the other pins would be ready for a charger! Mouser part number EA2-5TNJ or EA2-12TNJ.

Ed
Just one more wire!
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Postby Marvin Harten » Tue Sep 16, 2003 2:01 am

Hi-

Thanks to all of you for your help. I appreciate the time and effort to get the information for me.

Marvin
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