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275-218 DPDT relay wiring

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N777TY

Joined: 09 Apr 2006
Posts: 69
Location: Charlotte, NC

Posted: Sun Nov 26, 2006 5:27 pm Post subject: 275-218 DPDT relay wiring

Anyone has wiring diagram for wiring up Radio Shack 275-218 DPDT relay to a coolie hat switch used for trim?



There are two coil terminals.. I assumed one for each switch position (eg. up/down).. but do they need to be "energized" (feeding it +12V)?  Both? Only one?  I could try a few different things, but would rather ask before I start making smoke in the garage 



What I've got so far is:  1 & 2 are jumpered together and go to ground.  3 & 4 jumpered together and go to +12.  5 & 6 are outputs that go to the motor.. just not sure about these two coil terminals (7 & .



Thanks!



Radomir

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N777TY

nuckollsr(at)cox.net
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Posted: Sun Nov 26, 2006 7:30 pm Post subject: 275-218 DPDT relay wiring

At 05:27 PM 11/26/2006 -0800, you wrote:



 	  Quote: 	
		  



Anyone has wiring diagram for wiring up Radio Shack 275-218 DPDT relay to 

a coolie hat switch used for trim?



There are two coil terminals.. I assumed one for each switch position (eg. 

up/down).. but do they need to be "energized" (feeding it +12V)?  Both? 

Only one?  I could try a few different things, but would rather ask before 

I start making smoke in the garage 



What I've got so far is:  1 & 2 are jumpered together and go to ground.  3 

& 4 jumpered together and go to +12.  5 & 6 are outputs that go to the 

motor.. just not sure about these two coil terminals (7 & .


	


    See



http://www.aeroelectric.com/PPS/Flight/Trim/trim2.pdf

    You need two relays to do the architecture above.

    Use 1/2 (one pole) of each relay to control the +

    up and + down side of the trim actuator.



    Bob . . .

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N777TY

Joined: 09 Apr 2006
Posts: 69
Location: Charlotte, NC

Posted: Sun Nov 26, 2006 8:15 pm Post subject: Re: 275-218 DPDT relay wiring

Thanks.. apparently, can be done by doing this, which avoids using 2 relays:



  http://www.infinityaerospace.com/Flap.pdf

that's what I was looking for exactly.

PS.  Bob, it'd be very helpful to add this to the PPS drawings... beats buying/using 2 relays.

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N777TY

nuckollsr(at)cox.net
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Posted: Sun Nov 26, 2006 9:11 pm Post subject: 275-218 DPDT relay wiring

At 08:15 PM 11/26/2006 -0800, you wrote:



 	  Quote: 	
		  



Thanks.. apparently, can be done by doing this, which avoids using 2 relays:



   http://www.infinityaerospace.com/Flap.pdf

that's what I was looking for exactly.

PS.  Bob, it'd be very helpful to add this to the PPS drawings... beats 

buying/using 2 relays.


	


   Not if you want to use the coolie hat switch. The

   single relay circuit runs motor current through the

   pilot's control switch.  The coolie hat switch would

   certainly not withstand the current required to run

   a flap motor. It might be okay with the current to

   run a Ray-Allen actuator but one would have to publish

   that caveat on any drawing of this architecture to

   warn the builder that not only the relay but the switch

   needs to be rated for motor load currents.



   This is why I publish the generic 2-relay drawings you see

   on the website. This architecture ALWAYS works with

   ANY motor and switch combination because the switch

   handles relay coil currents only. The 2-relay architecture

   also provides dynamic braking by putting a dead short

   across a spinning motor when the motor is de-energized.

   Reduces coast against the limit switches.



   Bob . . .

      ---------------------------------------------------------

      < What is so wonderful about scientific truth...is that >

      < the authority which determines whether there can be   >

      < debate or not does not reside in some fraternity of   >

      < scientists; nor is it divine. The authority rests     >

      < with experiment.                                      >

      <                            --Lawrence M. Krauss       >

      ---------------------------------------------------------

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N777TY

Joined: 09 Apr 2006
Posts: 69
Location: Charlotte, NC

Posted: Sun Nov 26, 2006 9:55 pm Post subject: Re: 275-218 DPDT relay wiring

Thanks.. that makes sense.. I'm using this for trim (Ray Allen).. not flaps..

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