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Failing over voltage module

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Rob Henderson

Joined: 10 Jun 2011
Posts: 16

Posted: Fri Feb 13, 2015 8:19 am Post subject: Failing over voltage module

Bob

I purchased 1 of your OVM 2 years ago and have been flying with it for a year

I have a Glastar with a Subaru 2.5L and IR 70 Amp alternator using Z19RB as a platform

I modified the alt field circuit to use the OVM and installed a relay in the B lead using the Z24 interim

The circuit breaker for the alt field started to randomly trip and during troubleshooting I found the OVM was tripping even on battery only operations.

 

Can I send the part back for analysis?

Thanks

-Rob

   [quote][b]

nuckolls.bob(at)aeroelect
Guest

Posted: Fri Feb 13, 2015 10:14 am Post subject: Failing over voltage module

At 10:18 2015-02-13, you wrote:

Bob

I purchased 1 of your OVM 2 years ago and have been flying with it for a year

I have a Glastar with a Subaru 2.5L and IR 70 Amp alternator using 

Z19RB as a platform

I modified the alt field circuit to use the OVM and installed a relay 

in the B lead using the Z24 interim

The circuit breaker for the alt field started to randomly trip and 

during troubleshooting I found the OVM was tripping even on battery 

only operations.



Can I send the part back for analysis?

Thanks

-Rob

   Absolutely! Please do. It will be repaired/replaced

   under our lifetime warranty. It's a rare circumstance

   that I can get the carcass back on a fielded failure

   to perform.



   Box 130, Medicine Lodge, KS  67104-0130

   Bob . . .

Rob Henderson

Joined: 10 Jun 2011
Posts: 16

Posted: Fri Feb 13, 2015 11:52 am Post subject: Failing over voltage module

Thanks

I will try to get it out today

-Rob



--

nuckolls.bob(at)aeroelect
Guest

Posted: Sun Feb 22, 2015 12:38 pm Post subject: Failing over voltage module

Rob,



I put your OVM on the bench today. It's trip-point had drifted

UPWARD about 0.5 volts. I re-calibrated it and did a response

test. Its performance is pretty much in the center of

design goals.



Have you run the system (carefully) without the OVM?



Are voltages normal?  I"m really mystified about

battery-only tripping. There was nothing in the

performance or physical inspection that would explain

this.



I'd like to update your OVM more toward the response

curves of the next generation OV modules under

development. The original AEC/B&C devices were

pretty fast which made them twitchy in some systems.



If you can wait another 10 days or so, I'll send it

back to you with a slower profile.



Bob . . .


<robnrobinh(at)comcast.net>

Thanks

I will try to get it out today

-Rob

--

nuckolls.bob(at)aeroelect
Guest

Posted: Sun Feb 22, 2015 12:40 pm Post subject: Failing over voltage module

Rob,

If you can wait another 10 days or so, I'll send it

back to you with a slower profile.



Bob . . .



    P.S. I would simply replace the one you sent

    me but yours is an older configuration with

    the miniature pot . . . and I don't have any

    newer ones built. If the wait doesn't put

    you in a bind, the upgraded old unit is the

    better way to go.



   Bob . . .

Rob Henderson

Joined: 10 Jun 2011
Posts: 16

Posted: Sun Feb 22, 2015 10:14 pm Post subject: Failing over voltage module

Bob

Thanks for taking a look at it.

The breaker has not tripped since I removed the OV , it's been about an hour of flight time since removal. Previously the breaker would trip after a few minutes.

Yes I can wait for the new model.

-Rob



Sent from my Verizon Wireless 4G LTE smartphone


<div>-------- Original message --------</div><div>From: "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com> </div><div>Date:02/22/2015  12:39  (GMT-08:00) </div><div>To: aeroelectric-list(at)matronics.com </div><div>Subject: RE: AeroElectric-List: Failing over voltage module </div><div>

</div>


Rob,



If you can wait another 10 days or so, I'll send it

back to you with a slower profile.


Bob . . .


    P.S. I would simply replace the one you sent

    me but yours is an older configuration with

    the miniature pot . . . and I don't have any

    newer ones built. If the wait doesn't put

    you in a bind, the upgraded old unit is the

    better way to go.


   Bob . . .

nuckolls.bob(at)aeroelect
Guest

Posted: Mon Feb 23, 2015 8:12 am Post subject: Failing over voltage module

At 00:10 2015-02-23, you wrote:

 	  Quote: 	
		  Bob

Thanks for taking a look at it.

The breaker has not tripped since I removed the OV , it's been about 

an hour of flight time since removal. Previously the breaker would 

trip after a few minutes.

Yes I can wait for the new model.


	




   If wired per Z-24, and assuming the alternator

   is OFF at power-up, then the ov module is

   not even in the circuit . . .



   I'm pondering the original fault report. You

   said that it trips battery-only . . . I presume

   that this occurs instantly at power-on. Do

   I correctly assume that the alternator switch is

   already on before the battery switch?





   Bob . . .

Rob Henderson

Joined: 10 Jun 2011
Posts: 16

Posted: Mon Feb 23, 2015 1:12 pm Post subject: Failing over voltage module

Bob

The alternator is wired per the attached drawing

The OVM trips maybe 5 to 10 minutes after engine start.

Just turning on the DC Master switch without the engine running caused the

OVM to trip the breaker after a few minutes, a few times.



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nuckolls.bob(at)aeroelect
Guest

Posted: Tue Mar 03, 2015 9:02 am Post subject: Failing over voltage module

At 10:10 2015-02-23, you wrote:

 	  Quote: 	
		  

<nuckolls.bob(at)aeroelectric.com>



At 00:10 2015-02-23, you wrote:

>Bob

>Thanks for taking a look at it.

>The breaker has not tripped since I removed the OV , it's been 

>about an hour of flight time since removal. Previously the breaker 

>would trip after a few minutes.

>Yes I can wait for the new model.


	


    Parts were in yesterday. Will do the final assembly

    tests and get it into the mail today.



    I'm still mystified as to why you were getting trips

    in a battery only condition . . . with the alternator

    switch OFF, the ov module should be disconnected.





   Bob . . .

Rob Henderson

Joined: 10 Jun 2011
Posts: 16

Posted: Tue Mar 03, 2015 9:22 am Post subject: Failing over voltage module

Bob

Did you see the drawing I sent ?

It shows the main battery switch and alt field on 1 double pole single throw

switch

The battery and alt field will be on at the same time

I will use the pullable breaker to remove the alternator from the system if

needed.

Thanks

-Rob



--

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