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dan(at)azshowersolutions.
Guest

Posted: Mon Nov 01, 2010 8:10 pm Post subject: Z-16

I just received the S704-1 Alt OV disconnect relay from B&C. AFter searching 

several sources, I think I know how to connect. The question I have is...as 

there  are two coil tabs, does it matter how the polarity is attached? Thanks

Dan

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dan(at)azshowersolutions.
Guest

Posted: Tue Nov 02, 2010 12:16 pm Post subject: Z-16

Still no joy for answer to previous question below...?

----- Forwarded Message ----

From: Dan Billingsley <dan(at)azshowersolutions.com>

To: aeroelectric-list(at)matronics.com

Sent: Mon, November 1, 2010 9:05:02 PM

Subject: Z-16

I just received the S704-1 Alt OV disconnect relay from B&C. AFter searching 

several sources, I think I know how to connect. The question I have is...as 

there  are two coil tabs, does it matter how the polarity is attached? Thanks

Dan

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user9253

Joined: 28 Mar 2008
Posts: 1908
Location: Riley TWP Michigan

Posted: Wed Nov 03, 2010 6:05 am Post subject: Re: Z-16

Hi Dan,

I am not familiar with the S704-1 relay.  But since nobody else answered, I will give it a shot.  Polarity of the coil does not matter for most relays.  If a relay has a built in diode, then polarity will matter.  You could test the coil with an ohmmeter to see if the coil is short circuited with one polarity and not the other.  Or you could put a small lamp in series with the relay.  If the lamp gets brighter with one polarity compared to the opposite polarity, then there is a built in diode and the correct polarity is when the lamp is dim.  Or you could power up the relay using a power supply with built in short circuit protection and see what happens.  Or you could call B&C and ask them.

Joe

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_________________
Joe Gores

nuckolls.bob(at)aeroelect
Guest

Posted: Wed Nov 03, 2010 7:06 am Post subject: Z-16

At 09:05 AM 11/3/2010, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "user9253" <fran4sew(at)banyanol.com>



 Hi Dan,

 I am not familiar with the S704-1 relay.  But since nobody else answered, I will give it a shot.  Polarity of the coil does not matter for most relays.  If a relay has a built in diode, then polarity will matter.  You could test the coil with an ohmmeter to see if the coil is short circuited with one polarity and not the other.  Or you could put a small lamp in series with the relay.  If the lamp gets brighter with one polarity compared to the opposite polarity, then there is a built in diode and the correct polarity is when the lamp is dim.  Or you could power up the relay using a power supply with built in short circuit protection and see what happens.  Or you could call B&C and ask them. 	


    Good put. I'm aware of no commercial-off-the-shelf relays

    with built in diodes and only a few contactors with such

    devices already installed. If they DO feature internally

    wired diodes, the coil terminal polarity will be marked

    and the device will probably have some symbolism or

    text notification of the feature.



    The "S704" is a catalog number for a "T91" style

    SPDT relay first defined by Potter-Brumfield as

    I recall . . . and later 'cloned' by many others

    as popularity of this device soared.



 [img]cid:.0[/img]



   But it's nothing special. Any 12v, 30A, DPDT

   relay will do the same job . . . including

   this device from Radio Shack

 

 [img]cid:.1[/img]



   Catalog #275-226. Many of the BigBox auto parts

   stores sell similar devices in peg-racked blister-

   paks. It might be called a "headlight relay".

   But its a sure bet than none will feature built

   in diodes. Here's an exemplar part from the

   AutoZone website:



  http://tinyurl.com/24gobxs 



   Interestingly enough, AutoZone stocks a pre-terminated

   diode assembly that can be added to this or similar

   relays:



  http://tinyurl.com/2cqrk4q 



 



 

        Bob . . .



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

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

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

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nuckolls.bob(at)aeroelect
Guest

Posted: Wed Nov 03, 2010 7:42 am Post subject: Z-16

 	  Quote: 	
		    Interestingly enough, AutoZone stocks a pre-terminated

   diode assembly that can be added to this or similar

   relays:



  http://tinyurl.com/2cqrk4q 

 	


     Whew!!!! just noted that this part sells for

     about $10. Go get your own 1N5402, 75-cent

     critters from R-S . . .



 [img]cid:7.1.0.9.0.20101103103656.01d20110(at)aeroelectric.com.2[/img] 



 

        Bob . . .



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

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

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

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dan(at)azshowersolutions.
Guest

Posted: Wed Nov 03, 2010 7:48 am Post subject: Z-16

Joe and Bob,

Thank you for your reply...I found it interesting that the relay had little to 

no markings. It came with a sheet that identified a couple of contacts, yet left 

the coil to one's imagination. This led me to believe that polarity is not an 

issue. Again, thanks Joe for the reply and practicle things to try to make 

determinations.

Best wishes, Dan



---

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tim2542(at)sbcglobal.net
Guest

Posted: Wed Nov 03, 2010 10:05 am Post subject: Z-16

I bought relays from NAPA, no diode but they do have resistors in the coil circuit. I don't have the part number with me but can get it. 

Tim Andres



Sent from my iPhone



On Nov 3, 2010, at 8:04 AM, "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:



[quote] At 09:05 AM 11/3/2010, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "user9253" <fran4sew(at)banyanol.com (fran4sew(at)banyanol.com)>



 Hi Dan,

 I am not familiar with the S704-1 relay.  But since nobody else answered, I will give it a shot.  Polarity of the coil does not matter for most relays.  If a relay has a built in diode, then polarity will matter.  You could test the coil with an ohmmeter to see if the coil is short circuited with one polarity and not the other.  Or you could put a small lamp in series with the relay.  If the lamp gets brighter with one polarity compared to the opposite polarity, then there is a built in diode and the correct polarity is when the lamp is dim.  Or you could power up the relay using a power supply with built in short circuit protection and see what happens.  Or you could call B&C and ask them. 	


    Good put. I'm aware of no commercial-off-the-shelf relays

    with built in diodes and only a few contactors with such

    devices already installed. If they DO feature internally

    wired diodes, the coil terminal polarity will be marked

    and the device will probably have some symbolism or

    text notification of the feature.



    The "S704" is a catalog number for a "T91" style

    SPDT relay first defined by Potter-Brumfield as

    I recall . . . and later 'cloned' by many others

    as popularity of this device soared.



 <263881f.jpg>



   But it's nothing special. Any 12v, 30A, DPDT

   relay will do the same job . . . including

   this device from Radio Shack

 

 <263887d.jpg>



   Catalog #275-226. Many of the BigBox auto parts

   stores sell similar devices in peg-racked blister-

   paks. It might be called a "headlight relay".

   But its a sure bet than none will feature built

   in diodes. Here's an exemplar part from the

   AutoZone website:



  http://tinyurl.com/24gobxs 



   Interestingly enough, AutoZone stocks a pre-terminated

   diode assembly that can be added to this or similar

   relays:



  http://tinyurl.com/2cqrk4q 



 



 

        Bob . . .



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

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

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



   

[b]

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jonlaury

Joined: 06 Nov 2006
Posts: 336

Posted: Thu Nov 04, 2010 6:46 am Post subject: Re: Z-16

Bob said:

 	  Quote: 	
		  I'm aware of no commercial-off-the-shelf relays

with built in diodes and only a few contactors with such

devices already installed. 	




Check out http://www.texasindustrialelectric.com/relays.asp. They have several ice cube types w/diode, of varying capacity.

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pestar

Joined: 11 Apr 2007
Posts: 61
Location: Auckland, New Zealand

Posted: Thu Nov 04, 2010 11:49 pm Post subject: Re: Z-16

Go to http://www.narva.com.au/products/browse/relays, they have a range of relays with the diode built in at low cost.  I am using them for OV protection as per Bobs diagrams.



Yep I know it is down under but the relays are manufactured in Europe.



Cheers



Peter Armstrong

Auckland, New Zealand

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