Today's Message Index:
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0. 11:50 AM - Please Make a Contribution to Support Your Lists... (Matt Dralle)
1. 06:18 AM - Re: Re: OVP relay in B+ lead bad idea (Finn Lassen)
2. 09:47 AM - Re: OVP relay in B+ lead bad idea (user9253)
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| Subject: | Please Make a Contribution to Support Your Lists... |
Dear Listers,
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Matt Dralle
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RV-4/RV-6/RV-8 Builder/Rebuilder/Pilot
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| Subject: | Re: OVP relay in B+ lead bad idea |
Thank you Joe.
Wish I'd seen or paid attention to that back in 2016!
So an intermittently electrically open battery is definitely something
to allow for in an electrically dependent engine installation.
Certainly would explain the "noise" issues I was trying to solve.
I unfortunately bought into the "battery is backup for alternator and
alternator is backup for battery" idea.
When you have intermittent failure or weaknesses in both, that just
doesn't work.
I still have to investigate the alternator. Is it really possible for
its output voltage to drop low enough and long enough for a relay to
open when RPM drops? Or was it a heat and/or vibration issue?
RX-7 alternator re-man'd in 2002. I think I may even have replaced the
internal voltage regulator in the process of troubleshooting noise, etc.
Finn
On 11/14/2024 10:26 PM, user9253 wrote:
>
> Yes, Bob performed an autopsy.
> http://forum.matronics.com/viewtopic.php?p=460530
> .
> http://www.aeroelectric.com/Pictures/Battery_Failures/PC680_12SEP2016/11_Inter-cellconnectorweldfailure.jpg
>
> --------
> Joe Gores
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=514522#514522
>
>
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| Subject: | Re: OVP relay in B+ lead bad idea |
It takes a lot less voltage and current to hold a relay closed than it does to
first energize it.
Just because a circuit breaker is marked "5A" doesn't necessarily mean that it
will trip at exactly 5 amps.
It should be bench tested with an adjustable current power supply. It might be
tripping at much less than
5 amps. A loose connection will generate heat which can result in a breaker tripping
at
less than its rated current. The alternator field circuit breaker should not be
tripping.
-
Good job making a forced landing and walking away. Many pilots panic when the
engine
quits and pull back on the stick to avoid going down. The wings stall with fatal
results.
The ground doesn't give. Bob Hoover quote:
"If you're faced with a forced landing, fly the thing as far into the crash as
possible."
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=514526#514526
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