---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Wed 09/07/22: 4 ---------------------------------------------------------- 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 _____________________________________ Time: 08:30:30 AM PST US Subject: AeroElectric-List: Re: ULPower electrical system From: "user9253" 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 _____________________________________ Time: 09:44:53 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: 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 _____________________________________ Time: 09:46:13 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: 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 _____________________________________ Time: 10:57:19 PM PST US Subject: AeroElectric-List: Re: ULPower electrical system From: "Eric Page" 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? 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