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O/Vprotection for internally regulated alternator

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1rv4

Joined: 11 Sep 2006
Posts: 24

Posted: Thu Oct 03, 2024 7:51 pm Post subject: O/Vprotection for internally regulated alternator

Hi

I seem to remember there was a crowbar type overvoltage protection device for internaly regulated alternators. It had a relay to disconnect the B-lead. Can anyone shed some light on this or maybe I had a bad dream? 

Thanks

Chris

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Ceengland

Joined: 11 Oct 2020
Posts: 391
Location: MS

Posted: Fri Oct 04, 2024 6:18 pm Post subject: O/Vprotection for internally regulated alternator

Attached. Note that Bob later deleted references to using internally regulated alternators. But some versions of the Z figures using dynamo style alternators did include the relay & OV module depicted in the attached document. Also note that recent conversations on this list indicate that the SCR used in the OV module is no longer available. Bob is said to be working on an updated OV module.

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On Thu, Oct 3, 2024 at 10:56 PM 1rv4 <fconsult(at)telus.net (fconsult(at)telus.net)> wrote:



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		  --> AeroElectric-List message posted by: "1rv4" <fconsult(at)telus.net (fconsult(at)telus.net)>

 

 Hi

 I seem to remember there was a crowbar type overvoltage protection device for internaly regulated alternators. It had a relay to disconnect the B-lead. Can anyone shed some light on this or maybe I had a bad dream? 

 Thanks

 Chris

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=513852#513852

 

 

 

 

 

 

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Aeroelectric_crowbar_OV_module_plus_relay_CbOV-14_Installation_A.pdf

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Charlie

1rv4

Joined: 11 Sep 2006
Posts: 24

Posted: Sat Oct 05, 2024 8:43 am Post subject: Re: O/Vprotection for internally regulated alternator

Thankyou Charlie

 The attachment was very useful. I knew someone would remember.

   I wonder why Bob discontinued them? With the price of new alternators one would think the NOS Japanese made alternators would be a popular substitution.

   Chris

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Ceengland

Joined: 11 Oct 2020
Posts: 391
Location: MS

Posted: Sat Oct 05, 2024 7:29 pm Post subject: O/Vprotection for internally regulated alternator

The older regulators in IR  alternators often didn't have 'load dump' protection. People were 'testing' their OV modules with the alternator under load, and the resulting voltage spike when the relay opened would kill the internal regulator. So instead of invoking the HeHaw Doctor  principle (if it hurts when you do that,  don't do that), the recommendation became,  don't use IR alternators. 

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 On Oct 5, 2024, at 11:43 AM, 1rv4 <fconsult(at)telus.net (fconsult(at)telus.net)> wrote: 	  Quote: 	
		    	  Quote: 	
		  --> AeroElectric-List message posted by: "1rv4" <fconsult(at)telus.net>Thankyou Charlie The attachment was very useful. I knew someone would remember.   I wonder why Bob discontinued them? With the price of new alternators one would think the NOS Japanese made alternators would be a popular substitution.   ChrisRead this topic online here:http://forums.matronics.com/viewtopic.php?p=51385/www.matronics.com/Navigator?AeroElectric-List">http://www.matronics --> https://matronics.com/contribution

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Charlie

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