Today's Message Index:
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1. 12:26 AM - Re: AeroElectric-List Digest: 3 Msgs - 08/12/13 (Franz Fux)
2. 06:34 AM - Re: Alt field ckt breaker tripping (user9253)
3. 07:58 AM - Re: Re: Alt field ckt breaker tripping (R. curtis)
4. 10:42 AM - Re: Alt field ckt breaker tripping (jpkarnes@comcast.net)
Message 1
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| Subject: | Re: AeroElectric-List Digest: 3 Msgs - 08/12/13 |
unable to respond to any mail until the 20th of August,
Message 2
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| Subject: | Re: Alt field ckt breaker tripping |
> 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?
1. A wire shorting to ground could trip the breaker.
2. The overvoltage module might be set for the wrong voltage, thus tripping the
circuit breaker at normal voltages.
3. There could be high resistance in the alternator field circuit. This makes
the voltage regulator see a lower voltage than exists on the main bus. The voltage
regulator then puts out higher current in order to increase the alternator
output voltage.
4. The voltage regulator could be defective.
5. The circuit breaker could be getting warm from a bad connection.
6. The circuit breaker could be defective.
Number 3 above is the most likely cause of the problem. Every switch and terminal
connection is suspect. A combination of borderline connections can add up
their resistances to cause a lower voltage at the regulator.
Joe
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=406609#406609
Message 3
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| Subject: | Re: Alt field ckt breaker tripping |
>> 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?
>
> 1. A wire shorting to ground could trip the breaker.
> 2. The overvoltage module might be set for the wrong voltage, thus
> tripping the circuit breaker at normal voltages.
> 3. There could be high resistance in the alternator field circuit. This
> makes the voltage regulator see a lower voltage than exists on the main
> bus. The voltage regulator then puts out higher current in order to
> increase the alternator output voltage.
> 4. The voltage regulator could be defective.
> 5. The circuit breaker could be getting warm from a bad connection.
> 6. The circuit breaker could be defective.
>
> Number 3 above is the most likely cause of the problem. Every switch and
> terminal connection is suspect. A combination of borderline connections
> can add up their resistances to cause a lower voltage at the regulator.
This line was in the original post:
" The alternator is a Mitsubishi internally regulated
variety."
This may have a substantial effect on the operation,
as per Bob's previous posting.
Roger
--
Do you have a slow PC? Try a Free scan http://www.spamfighter.com/SLOW-PCfighter?cid=sigen
Message 4
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| Subject: | Re: Alt field ckt breaker tripping |
Hi all,
The engine and its electrical system has flown for over 100 hours.=C2- Th
e battery is a brand new 12V 18AH gel battery.=C2- The plane has not flow
n for over a year while some modifications/upgrades have been undertaken.
=C2- The only difference is the installation of a secondary ignition syst
em ala Paul Messenger's dual dizzy setup.=C2-=C2- I really doubt that t
here is a short to ground that is causing this problem.=C2-=C2-Do you r
ecommend installing an external voltage regulator and if so, which one?=C2
- Clearing =C2-this latest hurdle is the only thing keeping me from get
ting airborne again. :o)
John Karnes
Suquamish, WA
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