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rparigor(at)SUFFOLK.LIB.N
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 Posted: Fri Mar 17, 2006 9:59 pm Post subject: Capacitor with solder on connectors? |
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My partner purchased a 22,000 mF computer grade capacitor with a 35 volt
rating and 105C temperature rating for our Rotax 914.
It has small solder on connectors, it looks like it is intended to be
soldered to a circuit board. In addition the connectors look like they are
tin plated brass, and use an aluminium rivet to fasten the connector to
the inside of the capacitor.
If I strain relieve wires is this an acceptable capacitor to use?
My partner figured getting the higher temperature rating of 105C compared
to 85C, and a 35 volt rating over 25V was better.
Thx.
Ron Parigoris
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nuckollsr(at)cox.net
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| Posted: Sat Mar 18, 2006 7:50 am Post subject: Capacitor with solder on connectors? |
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At 05:53 AM 3/18/2006 +0000, you wrote:
| Quote: |
My partner purchased a 22,000 mF computer grade capacitor with a 35 volt
rating and 105C temperature rating for our Rotax 914.
It has small solder on connectors, it looks like it is intended to be
soldered to a circuit board. In addition the connectors look like they are
tin plated brass, and use an aluminium rivet to fasten the connector to
the inside of the capacitor.
If I strain relieve wires is this an acceptable capacitor to use?
|
Give it a try. It can't do anything worse than break
a terminal off making your system get noisy. You may
not even perceive the increase in noise from the cockpit.
| Quote: | My partner figured getting the higher temperature rating of 105C compared
to 85C, and a 35 volt rating over 25V was better.
|
Not a 'bad' thing to do . . . within bounds. Bigger
and higher is better and will probably increase
reliability. But one would be ill advised to pick
a 450v device for a 14v application.
We recommend the "computer grade" devices for
this application because they're fitted with robust
screw terminals much more convenient for installation.
Further, this style of capacitor is generally rated
for higher ripple currents . . . meaning it runs cooler
under high alternator loading. See:
http://www.aeroelectric.com/Pictures/Misc/Computer_Grade_Cap.jpg
But give the device you have a try. There are no risks
for damage to anything due to the capacitor coming unhooked.
Depending on how your wiring arrangement lends itself to
coming off the capacitor with some soft braided leads . . .
make from short pieces of outer jacket of coax. Cover with
heat shrink and use PIDG terminals or splices to connect
capacitor into the system.
Bob . . .
< What is so wonderful about scientific truth...is that >
< the authority which determines whether there can be >
< debate or not does not reside in some fraternity of >
< scientists; nor is it divine. The authority rests >
< with experiment. >
< --Lawrence M. Krauss >
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mcculleyja(at)starpower.n
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| Posted: Sat Mar 18, 2006 8:17 am Post subject: Capacitor with solder on connectors? |
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Is it not wise to also put a fuse(or equivalent)protection in series
with the capacitor to handle a possible dead short within the capacitor?
Jim McCulley
Robert L. Nuckolls, III wrote:
| Quote: |
At 05:53 AM 3/18/2006 +0000, you wrote:
>
>
>My partner purchased a 22,000 mF computer grade capacitor with a 35 volt
>rating and 105C temperature rating for our Rotax 914.
>
>It has small solder on connectors, it looks like it is intended to be
>soldered to a circuit board. In addition the connectors look like they are
>tin plated brass, and use an aluminium rivet to fasten the connector to
>the inside of the capacitor.
>
>If I strain relieve wires is this an acceptable capacitor to use?
Give it a try. It can't do anything worse than break
a terminal off making your system get noisy. You may
not even perceive the increase in noise from the cockpit.
>My partner figured getting the higher temperature rating of 105C compared
>to 85C, and a 35 volt rating over 25V was better.
Not a 'bad' thing to do . . . within bounds. Bigger
and higher is better and will probably increase
reliability. But one would be ill advised to pick
a 450v device for a 14v application.
We recommend the "computer grade" devices for
this application because they're fitted with robust
screw terminals much more convenient for installation.
Further, this style of capacitor is generally rated
for higher ripple currents . . . meaning it runs cooler
under high alternator loading. See:
http://www.aeroelectric.com/Pictures/Misc/Computer_Grade_Cap.jpg
But give the device you have a try. There are no risks
for damage to anything due to the capacitor coming unhooked.
Depending on how your wiring arrangement lends itself to
coming off the capacitor with some soft braided leads . . .
make from short pieces of outer jacket of coax. Cover with
heat shrink and use PIDG terminals or splices to connect
capacitor into the system.
Bob . . .
< What is so wonderful about scientific truth...is that >
< the authority which determines whether there can be >
< debate or not does not reside in some fraternity of >
< scientists; nor is it divine. The authority rests >
< with experiment. >
< --Lawrence M. Krauss >
|
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nuckollsr(at)cox.net
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| Posted: Sat Mar 18, 2006 9:05 am Post subject: Capacitor with solder on connectors? |
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At 11:15 AM 3/18/2006 -0500, you wrote:
| Quote: |
<mcculleyja(at)starpower.net>
Is it not wise to also put a fuse(or equivalent)protection in series
with the capacitor to handle a possible dead short within the capacitor?
|
It wouldn't hurt. I've not seen it done recently in the type certificated
world. Electrolytic capacitors tend to die by loosing their ability to
capacitate (there's a word for you) . . . they dry out and simply become
more open circuit than anything else.
However, if a capacitor is poorly chosen and ripple currents in normal
operation exceed the device's ability to withstand the temperature rise,
there is a risk of shorting. So, it's not irrational to consider an
in-line fuseholder. I suspect that a failing capacitor is more likely
to stink and leak at current levels well below dead-short so picking a
suitable fuse is problematic and benefits are difficult to gage.
Bob . . .
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