Today's Message Index:
----------------------
1. 08:30 AM - Re: ULPower electrical system (user9253)
2. 09:44 PM - Re: Forest of tabs - corrosion question (Robert L. Nuckolls, III)
3. 09:46 PM - Re: Re: ULPower electrical system (Robert L. Nuckolls, III)
4. 10:57 PM - Re: ULPower electrical system (Eric Page)
Message 1
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| Subject: | Re: ULPower electrical system |
Below is a drawing showing 3 relays that can shut off the charging system right
at the source.
Substitute the 3 relays for the single relay shown in Z-16. Only one flyback diode
is needed for all 3 relays.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=507844#507844
Attachments:
http://forums.matronics.com//files/3_phase_dynamo_119.png
Message 2
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| Subject: | Re: Forest of tabs - corrosion question |
At 05:43 PM 9/6/2022, you wrote:
>
>Recently on one of the Vans facebook groups, there was a picture of
>a homemade forest of tabs that another builder made for their
>electrical system. This led to a discussion on whether the aluminum
>rivets holding the tabs onto the copper plate would corrode, whether
>brass rivets were necessary, etc.
>
>My question is this - if aluminum "sacrifices" itself when in
>contact with copper due to galvanic corrosion, why doesn't the
>aluminum sheet/structure that contacts a forest of tabs corrode? Is
>it the presumed lack of an electrolyte? Is it a requirement to use
>some magic unobtanium alloy of copper?
Excellent question . . .
The original design I crafted for B&C's products
SOLDERED strips of tabs to the base plate. This
preserves electrical integrity between bus plate
and tabs.
At the time it was designed the target mounting
surfaces were stainless and composite
firewalls.
This assembly can be mounted on an aluminum surface
that stays dry.
Riveted assemblies are not recommended.
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
Message 3
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| Subject: | Re: ULPower electrical system |
At 10:29 AM 9/7/2022, you wrote:
>
>Below is a drawing showing 3 relays that can shut off the charging
>system right at the source.
>Substitute the 3 relays for the single relay shown in Z-16. Only
>one flyback diode is needed for all 3 relays.
You only need two relays to completely shut down
the 3-phase supply.
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
Message 4
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| Subject: | Re: ULPower electrical system |
user9253 wrote:
> The UL Power manual warns that the regulator ... will be destroyed if it is disconnected
from the battery.
nuckolls.bob(at)aeroelect wrote:
> You only need two relays to completely shut down the 3-phase supply.
Thinking out loud here... If the OVP sensor trips, then isn't it safe to assume
that the regulator has already failed? If so, then why would we be concerned
about damaging it by disconnecting it from the battery? Is there some other
reason not to use a single relay to disconnect the regulator's output from the
bus rather than multiple relays to disconnect the alternator's phases from the
regulator?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=507847#507847
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