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rehn(at)rockisland.com
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 Posted: Tue Apr 15, 2014 4:37 pm Post subject: Capacitor, regulator-rectifier 912/914 |
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A few years ago I had a regulator fail, I am thinking about replacing the regulator again as a preventative and keeping the old one as a spare. Was wondering if the capacitor has a life cycle, replacement time or? How does one know if it's working or failed? Don't know much about this, so any advice is welcome. Thanks.
Jerry
Mono XS 914
Sent from my iPads
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davidjoyce(at)doctors.org
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| Posted: Wed Apr 16, 2014 2:24 am Post subject: Capacitor, regulator-rectifier 912/914 |
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Jerry, Why not simply carry the new one as a spare, which
is what I do, after having had a failure 7 or 8 years ago?
I am inclined to feel that the one that has shown it works
nicely is worth keeping!
Regards, David Joyce, G-XSDJ
On Tue, 15 Apr 2014 17:36:18 -0700
Jerry Rehn <rehn(at)rockisland.com> wrote:
| Quote: |
<rehn(at)rockisland.com>
A few years ago I had a regulator fail, I am thinking
about replacing the regulator again as a preventative and
keeping the old one as a spare. Was wondering if the
capacitor has a life cycle, replacement time or? How does
one know if it's working or failed? Don't know much about
this, so any advice is welcome. Thanks.
Jerry
Mono XS 914
Sent from my iPads
Un/Subscription,
Forums!
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jan_de_jong(at)casema.nl
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| Posted: Wed Apr 16, 2014 6:24 am Post subject: Capacitor, regulator-rectifier 912/914 |
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I don't know what you want to do, but here some remarks.
1. The regulator is very sensitive to operating temperature. Cycling
to/from high temperature leads to open circuit of one leg of the
rectifier bridge and insufficient voltage for charging. Rotax says < 85
degrees C, much lower is much better. A lot of heat is generated in the
regulator. It increases with output current.
2. Aluminium electrolytic capacitor lifetime is very sensitive to
temperature:
http://www.illinoiscapacitor.com/tech-center/life-calculators.aspx
(note: a minimum standard rating would be 1000h at 85 degrees C and 20V,
but see the datasheet)
When not flying the capacitor is operated at 0V and hangar temperature
-> find lifetime in calendar hours (9000 hours is a year)
When flying the capacitor is operated at 15V and whatever the
under-cowling temperature is plus 10 degrees C -> find lifetime in
flying hours (the 10 degrees C should more than cover the heat generated
in the capacitor by ripple current)
The most limiting outcome wins
3. Testing the capacitor requires both capacitance and ESR measurement.
Not difficult but requires some tools and understanding. When in doubt I
would buy a new one.
Jan de Jong
On 4/16/2014 2:36 AM, Jerry Rehn wrote:
| Quote: |
A few years ago I had a regulator fail, I am thinking about replacing the regulator again as a preventative and keeping the old one as a spare. Was wondering if the capacitor has a life cycle, replacement time or? How does one know if it's working or failed? Don't know much about this, so any advice is welcome. Thanks.
Jerry
Mono XS 914
|
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