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                           AeroElectric-List Digest Archive
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                     Total Messages Posted Mon 08/12/13: 3
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Today's Message Index:
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     1. 12:35 AM - Re: AeroElectric-List Digest: 12 Msgs - 08/11/13  (Franz Fux)
     2. 04:26 PM - Alt field ckt breaker tripping  (jpkarnes@comcast.net)
     3. 08:33 PM - Re: Alt field ckt breaker tripping  (Robert L. Nuckolls, III)
 
 
 
________________________________  Message 1  _____________________________________


Time: 12:35:56 AM PST US
From: "Franz Fux" <franz@lastfrontierheli.com>
Subject: AeroElectric-List: Re: AeroElectric-List Digest: 12 Msgs - 08/11/13


unable to respond to any mail until the 20th of August,


________________________________  Message 2  _____________________________________


Time: 04:26:23 PM PST US
From: jpkarnes@comcast.net
Subject: AeroElectric-List: Alt field ckt breaker tripping


My 5 amp alternator field circuit breaker is tripping after the engine runs
 for about a minute.=C2- I removed the alternator and had it evaluated @ 
the local auto parts store and it checked out OK.=C2- What other causes o
ther than an overvoltage condition could cause this to happen?=C2- The al
ternator is a Mitsubishi internally regulated variety.=C2- The system is 
fashioned on the "general aviation" schematic in the Aeroelectric=C2-appe
ndix.=C2- I just completed an upgrade to include a secondary ignition set
up with a switch to=C2-select the primary/secondary ignition.=C2- The e
ngine is an EA-81 =C2-Stratus Subaru engine on a Zenith 601 HDS. 

________________________________  Message 3  _____________________________________


Time: 08:33:29 PM PST US
From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
Subject: Re: AeroElectric-List: Alt field ckt breaker tripping


At 06:25 PM 8/12/2013, you wrote:

>My 5 amp alternator field circuit breaker is tripping after the 
>engine runs for about a minute.  I removed the alternator and had it 
>evaluated @ the local auto parts store and it checked out OK.  What 
>other causes other than an overvoltage condition could cause this to 
>happen?  The alternator is a Mitsubishi internally regulated 
>variety.  The system is fashioned on the "general aviation" 
>schematic in the Aeroelectric appendix.  I just completed an upgrade 
>to include a secondary ignition setup with a switch to select the 
>primary/secondary ignition.  The engine is an EA-81 Stratus Subaru 
>engine on a Zenith 601 HDS.

    Has the airplane flown? Has the system operated as
    expected in the past but shows a new symptom?
    Most alternators with built in regulators are not
    strictly compatible with the crowbar ov module
    sold by B&C and myself.

    The 5A field breaker needs to have ABSOLUTE control
    over field excitation voltage. This generally
    accomplished by some modification of the alternator's
    internal wiring . . . like a PlanePower, or modified
    for external regulation like B&C.

    This does not explain the symptoms you're seeing.
    I didn't fine your email address in my sales records
    which suggests you got the OVM from B&C.

    If you like, you can send me the OVM and I'll make
    sure it's calibrated correctly. This is the first
    step toward understanding root cause for the trips.
    How old is your battery and what size?


   Bob . . . 


 

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