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Lamar voltage regulator and overvoltage relay questions

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N1921R

Joined: 31 Jan 2024
Posts: 7

Posted: Sun May 05, 2024 5:47 pm Post subject: Lamar voltage regulator and overvoltage relay questions

Someone on VAF asked and made me curious.



Aircraft has:

Electrosystems 60A alternator PN ALX8421RS

Lamar voltage regulator B-00267-2

Lamar overvoltage relay B-00339-1

Owner suspects regulator is bad.



I wonder:

What is this overvoltage relay and how is it wired.

Can a Ford regulator VR166 be used in combination with this overvoltage relay? (Lamar regulator B-00267-2 is only available used and is expensive.)

BTW I’m aware of Bob Nuckolls’ regulator swap test method. http://www.aeroelectric.com/Pictures/Regulators/Ford_Test_Reg.jpg



Thanks

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_________________
John Bright, RV-6A N1921R, working on FWF.
Single battery, alternator on main bus, Monkworkz generator on engine/essential bus.
My links here

user9253

Joined: 28 Mar 2008
Posts: 1913
Location: Riley TWP Michigan

Posted: Mon May 06, 2024 5:48 am Post subject: Re: Lamar voltage regulator and overvoltage relay questions

Found this via google search:

https://www.bonanza.org/globalassets/aircraft/service-instructions/si-1062---electrical-power---installation-of-an-overvoltage-relay-for-the-60-amp-alternator-system.pdf

So evidently the relay opens the circuit to the voltage regulator if the electrical system voltage is too high.

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Joe Gores

N1921R

Joined: 31 Jan 2024
Posts: 7

Posted: Mon May 06, 2024 9:01 am Post subject: Re: Lamar voltage regulator and overvoltage relay questions

Thanks Joe,



It seems to me:

The OP can use a "Ford" VR166 voltage regulator.

The overvoltage field interrupter relay is from a former time before overvoltage crowbars.



The subject VAF thread is at: https://vansairforce.net/threads/alternator-field-voltage.226640/

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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_________________
John Bright, RV-6A N1921R, working on FWF.
Single battery, alternator on main bus, Monkworkz generator on engine/essential bus.
My links here

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