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Contactor Questions

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A Lumley

Joined: 12 May 2021
Posts: 10
Location: Ontario, Canada

Posted: Thu May 13, 2021 11:10 am Post subject: Contactor Questions

Good afternoon,



I'm working on a schematic for my RV-10 based on the Z-101 architecture and have come up with a couple questions about contactors...



First, about the starter contactor. The Z-101 shows a single conductor connecting the contactor to the starter with a jumper at the starter. I found another discussion from 2015 with an alternative arrangement (attached) for permanent magnet starters. I'm planning to use a B&C starter. Should I be using the extra wire & diode?



Second, I'm adding an external power outlet per Z-31A. I've made sense of most of this drawing but I'm unsure why there is no diode shown across the coil in the Z-31A diagram? The B&C continuous contactor includes an external diode already. Should it be removed?



Thanks for taking the time to read my perhaps basic questions!

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user9253

Joined: 28 Mar 2008
Posts: 1920
Location: Riley TWP Michigan

Posted: Thu May 13, 2021 3:57 pm Post subject: Re: Contactor Questions

Z-31A does not require a diode because the over-voltage module provides arc suppression.

No, do not remove the B&C installed diode.  It does not hurt anything.

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_________________
Joe Gores

nuckolls.bob(at)aeroelect
Guest

Posted: Thu May 13, 2021 7:31 pm Post subject: Contactor Questions

At 02:10 PM 5/13/2021, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "A Lumley" <andrew.lumley(at)sympatico.ca>



 Good afternoon,



 I'm working on a schematic for my RV-10 based on the Z-101 architecture and have come up with a couple questions about contactors...



 First, about the starter contactor. The Z-101 shows a single conductor connecting the contactor to the starter with a jumper at the starter. I found another discussion from 2015 with an alternative arrangement (attached) for permanent magnet starters. I'm planning to use a B&C starter. Should I be using the extra wire & diode? 	


   By 'extra wire' are you talking about the jumper from

   contactor "I" terminal to the starter's "S"

   terminal?  Yes, wire as shown and including

   the diode is a good thing.  The starter contactor

   from B*C will include a built in diode on its

   coil.



  	  Quote: 	
		  Second, I'm adding an external power outlet per Z-31A. I've made sense of most of this drawing but I'm unsure why there is no diode shown across the coil in the Z-31A diagram? The B&C continuous contactor includes an external diode already. Should it be removed? 	


   Wouldn't hurt but not necessary assuming you

   can get a B*C crowbar ov module. Are those

   available? I though those were out of production.  



 

  	  Quote: 	
		  Thanks for taking the time to read my perhaps basic questions! 	


   That's what this organization is here for

   my friend . . . folks that already know everything

   don't need us!



 

 

   Bob . . .



   Un impeachable logic: George Carlin asked, "If black boxes

   survive crashes, why don't they make the whole airplane

   out of that stuff?"

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A Lumley

Joined: 12 May 2021
Posts: 10
Location: Ontario, Canada

Posted: Thu May 13, 2021 7:42 pm Post subject: Re: Contactor Questions

Thanks to you both for the quick feedback. I'll include the jumper from the contactor "I" terminal to the starter with the extra diode.



You are correct that B&C no longer sells the crowbar module so I was going to build my own from your crowbar schematics.



Thanks again, I'm sure I'll have lots more questions...

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