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Bi-Directional Zeners for Contactors

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gmcjetpilot

Joined: 04 Nov 2006
Posts: 170

Posted: Tue Oct 13, 2009 11:26 am Post subject: Bi-Directional Zeners for Contactors

The EV200 is a different animal from the ubiquitous coil/solenoid/contactor. I did lots of 

 research on this. Notice the activation and latched current? Very small. You don't 

 need diodes. The EMF part, I'm not sure about. The diode on the classic contactor is 

 to suppress the voltage spike from the collapsing field, thus protecting the switch from arching and reduced life and failure.

  

 I don't recall the details, but the EV200 uses different mechanical geometry and electro-

 magnetism activation and scheme that is more efficient, while maintaining ridiculous power 

 specs. 

  

 I also looked at the cost v benefit. On a Lancair, cost no object, EV200 why not. For the 

 average home built, even my RV7 the standard contactors are fine. Still the price of the 

 EV200 has come way down; it's an attractive option now, especially for saving weight. It 

 does not weigh a lot less it self versus a standard contactor, but it uses about +0.50 amps 

 less to stay latched. For guys trying to fly day/night deluxe VFR with a lighter wight 30 or 

 40 amp alternator, every 0.50 amp counts.

  

 These are my opinions. If you don't like them, request a refund for what you paid for it.

  

 Cheers.

  

  

 >From: mikeeasley <mikeeasley(at)aol.com (mikeeasley(at)aol.com)>

 	  Quote: 	
		  Subject: Diodes vs. Bi-Directional Zeners for Contactors


	


 	  Quote: 	
		  I'm building a new power grid for a customer and the research on contactors ended

up with some digging on the diodes that we use across the coils of the contactors,

and whether they're necessary.  We're using a couple Tyco Kilovac EV200s

and since they have pigtail wires instead of terminals, it's tougher to install

the diodes.  Tyco says we don't need "back EMF protection" with the EV200s.

But we are also using the LEV100 contactors, which do need the back EMF protection.


	


           [quote][b]

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mikeeasley(at)aol.com
Guest

Posted: Tue Oct 13, 2009 11:58 am Post subject: Bi-Directional Zeners for Contactors

The Tyco EV200 has built-in back EMF suppression according to the engineer at Tyco Kilovac.  I didn't ask him what kind of suppression, but he confirmed that it wasn't necessary to have any external suppression.  The LEV series needs external suppression.  The EV series has a circuit that reduces coil amperage once it closes also.

  

 Mike Easley

 Colorado Springs

  

  

  

 In a message dated 10/13/09 13:27:27 Mountain Daylight Time, gmcjetpilot(at)yahoo.com writes:

  	  Quote: 	
		     .aolmailheader          {font-size:8pt; color:black; font-family:Arial} a.aolmailheader:link    {color:blue; text-decoration:underline; font-weight:normal} a.aolmailheader:visited {color:magenta; text-decoration:underline; font-weight:normal} a.aolmailheader:active  {color:blue; text-decoration:underline; font-weight:normal} a.aolmailheader:hover   {color:blue; text-decoration:underline; font-weight:normal}       The EV200 is a different animal from the ubiquitous coil/solenoid/contactor. I did lots of 

 research on this. Notice the activation and latched current? Very small. You don't 

 need diodes. The EMF part, I'm not sure about. The diode on the classic contactor is 

 to suppress the voltage spike from the collapsing field, thus protecting the switch from arching and reduced life and failure.

  

 I don't recall the details, but the EV200 uses different mechanical geometry and electro-

 magnetism activation and scheme that is more efficient, while maintaining ridiculous power 

 specs. 

  

 I also looked at the cost v benefit. On a Lancair, cost no object, EV200 why not. For the 

 average home built, even my RV7 the standard contactors are fine. Still the price of the 

 EV200 has come way down; it's an attractive option now, especially for saving weight. It 

 does not weigh a lot less it self versus a standard contactor, but it uses about +0.50 amps 

 less to stay latched. For guys trying to fly day/night deluxe VFR with a lighter wight 30 or 

 40 amp alternator, every 0.50 amp counts.

  

 These are my opinions. If you don't like them, request a refund for what you paid for it.

  

 Cheers.

  

  

 >From: mikeeasley <mikeeasley(at)aol.com (mikeeasley(at)aol.com)>

 	  Quote: 	
		  Subject: Diodes vs. Bi-Directional Zeners for Contactors


	


 	  Quote: 	
		  I'm building a new power grid for a customer and the research on contactors ended

up with some digging on the diodes that we use across the coils of the contactors,

and whether they're necessary.  We're using a couple Tyco Kilovac EV200s

and since they have pigtail wires instead of terminals, it's tougher to install

the diodes.  Tyco says we don't need "back EMF protection" with the EV200s.

But we are also using the LEV100 contactors, which do need the back EMF protection.


	


 	  Quote: 	
		  

	


	
  

 

   [quote][b]

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bobmeyers(at)meyersfamily
Guest

Posted: Tue Oct 13, 2009 2:44 pm Post subject: Bi-Directional Zeners for Contactors

That .50 amp savings was why I put one in my Aerovee powered Sonex with a 20 amp alternator.  I had already mounted a fine cheap one from B&C but I had an opportunity to get one cheap and replace it.



"Scotty, I need more power"



 Bob Meyers



Building Sonex 982SX Web Site Index http://meyersfamily.org/Sonex982.html

 



On Oct 13, 2009, at 2:24 PM, gmcjetpilot(at)yahoo.com (gmcjetpilot(at)yahoo.com) wrote:

[quote]The EV200 is a different animal from the ubiquitous coil/solenoid/contactor. I did lots of 

 research on this. Notice the activation and latched current? Very small. You don't 

 need diodes. The EMF part, I'm not sure about. The diode on the classic contactor is 

 to suppress the voltage spike from the collapsing field, thus protecting the switch from arching and reduced life and failure.

  

 I don't recall the details, but the EV200 uses different mechanical geometry and electro-

 magnetism activation and scheme that is more efficient, while maintaining ridiculous power 

 specs. 

  

 I also looked at the cost v benefit. On a Lancair, cost no object, EV200 why not. For the 

 average home built, even my RV7 the standard contactors are fine. Still the price of the 

 EV200 has come way down; it's an attractive option now, especially for saving weight. It 

 does not weigh a lot less it self versus a standard contactor, but it uses about +0.50 amps 

 less to stay latched. For guys trying to fly day/night deluxe VFR with a lighter wight 30 or 

 40 amp alternator, every 0.50 amp counts.

  

 These are my opinions. If you don't like them, request a refund for what you paid for it.

  

 Cheers.

  

  

 >From: mikeeasley <mikeeasley(at)aol.com (mikeeasley(at)aol.com)>

 	  Quote: 	
		  Subject: Diodes vs. Bi-Directional Zeners for Contactors


	


 	  Quote: 	
		  I'm building a new power grid for a customer and the research on contactors ended

up with some digging on the diodes that we use across the coils of the contactors,

and whether they're necessary.  We're using a couple Tyco Kilovac EV200s

and since they have pigtail wires instead of terminals, it's tougher to install

the diodes.  Tyco says we don't need "back EMF protection" with the EV200s.

But we are also using the LEV100 contactors, which do need the back EMF protection.


	


  	  Quote: 	
		  



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