---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Thu 07/12/18: 12 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 02:58 AM - Re: Making your own fuseable links (JOHN TIPTON) 2. 03:46 AM - Re: CROWBARS? (bob noffs) 3. 05:50 AM - Re: CROWBARS? (Robert L. Nuckolls, III) 4. 05:55 AM - Re: Re: Making your own fuseable links (Robert L. Nuckolls, III) 5. 08:32 AM - Re: Z-* Question (jonlaury) 6. 10:47 AM - Non Aviation electrical conponent question (Mike Nellis) 7. 10:49 AM - Re: Making your own fuseable links (JOHN TIPTON) 8. 11:02 AM - Re: Re: Z-* Question (Charles Plumery) 9. 11:52 AM - Re: Non Aviation electrical conponent question (user9253) 10. 12:06 PM - Re: Non Aviation electrical conponent question (user9253) 11. 12:20 PM - Re: Making your own fuseable links (user9253) 12. 02:53 PM - Re: Re: Non Aviation electrical conponent question (Mike Nellis) ________________________________ Message 1 _____________________________________ Time: 02:58:48 AM PST US Subject: AeroElectric-List: Re: Making your own fuseable links From: "JOHN TIPTON" Hi Bob Your answer relates to the Z11 wiring we are using: specifically the Endurance Bus feed, the diagram shows a live feed to a Fuse Block (Main Battery Bus), then a 7 amp fuse to the Endurance Buss switch, then to to Endurance Bus. We are doing without the the main Battery Bus as not required, now this leaves us without the 7 amp protection, so I was going to put a 'fusible link' at the Battery Contactor - incidently we are using 14AWG (because we have it, we do not have any 16AWG). I need to make up a 18AWG fusible Link John Read this topic online here: http://forums.matronics.com/viewtopic.php?p=481597#481597 ________________________________ Message 2 _____________________________________ Time: 03:46:09 AM PST US From: bob noffs Subject: Re: AeroElectric-List: CROWBARS? well, i guess i should wire in a crowbar. seems like it should be pretty straight forward to have it break the circuit to the field. i will take a look in bob's book for ideas and go from there. thanks everyone for the advice. bob noffs On Wed, Jul 11, 2018 at 10:54 PM, James Kale wrote : > jimkale@roadrunner.com> > > Different alternators have different failure mode. I recently saw a > friend=99s Cessna 172 after it suffered some sort of over voltage c ondition. > If. I had not seen it, I would not have believed the damage. Every > electrical component was fried. The insulation on every wire was burned .. > I did not know an alternator was capable of that sort of damage. I do kn ow > a crowbar would have Prevented it though. Like I said, if I had not > personally seen the damage I would not have believed how bad it was. Eve ry > wire and electrical component in the airplane had to be replaced. It is > possible that not all alternators are capable of that sort of failure > mode. But it sure opened my eyes and I would not want to have been on > board when it occurred. Jim Kale, Enterprise, AL > > Sent from my iPhone > > > On Jul 11, 2018, at 10:45 AM, Charlie England > wrote: > > > ceengland7@gmail.com> > > > >> On 7/11/2018 6:42 AM, bobnoffs wrote: > >> > >> hi all, > >> in the past a crowbar would stop the current from an overvoltage > source quick enough to prevent avionics damage. > >> is that really needed any more? > >> i have a honda [viking] engine with auto accessories. i don't hear of > cars blowing out their glass dashboards. > >> when i asked b and c about a 'crowbar' they said theirs was only > recommended for a permanent magnet alternator. > >> what are others doing with auto alternators? > >> thanks > >> bob noffs > >> > > I think their answer was framed in the assumption that you're using onl y > their products. The B&C regulators for conventional alternators have > overvoltage protection built into them. > > > > I've read 'rumors on the interwebs' that the latest auto tech often > builds voltage regulation into the vehicle's system computer, that contro ls > virtually everything else in the vehicle, too. Not a big deal to build in > overvoltage protection too, in that environment. It's unlikely that the > Viking is using the stock auto controller (pray that it doesn't; too many > 'protections' in auto controllers that can kill you in an a/c). > > > > I've run my dirt-simple RV-4 without OV protection for a long time, but > with expensive avionics in the -7 I'm building, I *will* have OV protecti on. > > > > Charlie > > > > --- > > This email has been checked for viruses by Avast antivirus software. > > https://www.avast.com/antivirus > > > > > > > > > > =========== =========== =========== =========== =========== > > ________________________________ Message 3 _____________________________________ Time: 05:50:38 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: CROWBARS? At 05:45 AM 7/12/2018, you wrote: >well, i guess i should wire in a crowbar. seems like it should be >pretty straight forward to have it break the circuit to the field. i >will take a look in bob's book for ideas and go from there. The crowbar ov protection module can be added to any system wherein alternator field power is taken through a typical 5A breaker. The module is wired from field supply line to ground at any point downstream of that breaker. You can find examples in the Z-figures. Bob . . . ________________________________ Message 4 _____________________________________ Time: 05:55:08 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: Making your own fuseable links At 04:58 AM 7/12/2018, you wrote: > > >Hi Bob > >Your answer relates to the Z11 wiring we are using: specifically the >Endurance Bus feed, the diagram shows a live feed to a Fuse Block >(Main Battery Bus), then a 7 amp fuse to the Endurance Buss switch, >then to to Endurance Bus. > >We are doing without the the main Battery Bus as not required, now >this leaves us without the 7 amp protection, so I was going to put a >'fusible link' at the Battery Contactor - incidently we are using >14AWG (because we have it, we do not have any 16AWG). > >I need to make up a 18AWG fusible Link I'd just move the 30A in-line alternate feed fuseholder over to the battery, eliminate the battery bus, mount the alternate feed relay adjacent to the battery contactor. Use the in-line fuseholder to 'jumper' between the alternate feed relay and battery contactor. Bob . . . ________________________________ Message 5 _____________________________________ Time: 08:32:14 AM PST US Subject: AeroElectric-List: Re: Z-* Question From: "jonlaury" BMC_Dave wrote: > It almost feels like I'm being intentionally gaslit, I'll try again. ... (snip) For the etymologically curious: "The original (meaning) stems from 1938 stage play Gas Light and the dimming of the gas lights in the house that happened when the husband was using the gas lights in the flat above while searching for the jewels belonging to a woman whom he had murdered. The wife correctly notices the dimming lights and discusses it with her husband, but he insists that she merely imagined a change in the level of illumination." Read this topic online here: http://forums.matronics.com/viewtopic.php?p=481608#481608 ________________________________ Message 6 _____________________________________ Time: 10:47:43 AM PST US From: Mike Nellis Subject: AeroElectric-List: Non Aviation electrical conponent question I'm working on a commercial microwave oven in one of my restaurants. One of the fuses blows when the start button is depressed. There are 2 magnetron tubes, one fan and 2 capacitors and 2 diodes. I still have more troubleshooting to do but i was curious if someone could tell me the purpose of the diodes in the picture. Both diodes are checking bad on my Greenlee Meter (model DM-60). https://photos.app.goo.gl/JKPdZ5u1VStbfrdk8 On Thu, Jul 12, 2018, 10:34 jonlaury wrote: > > > BMC_Dave wrote: > > It almost feels like I'm being intentionally gaslit, I'll try again. ... > (snip) > > > For the etymologically curious: > > "The original (meaning) stems from 1938 stage play Gas Light and the > dimming of the gas lights in the house that happened when the husband was > using the gas lights in the flat above while searching for the jewels > belonging to a woman whom he had murdered. The wife correctly notices the > dimming lights and discusses it with her husband, but he insists that she > merely imagined a change in the level of illumination." > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=481608#481608 > > ________________________________ Message 7 _____________________________________ Time: 10:49:07 AM PST US Subject: AeroElectric-List: Re: Making your own fuseable links From: "JOHN TIPTON" Hi Bob It's obvious that I do not have the latest version of Z11 (mine being rev:M) as the drawing does not include any '30A in-line alternate feed fuseholder' or the 'alternate feed relay' which you mention. What 'revision' are we on now and can you give me a link please Regards: John Read this topic online here: http://forums.matronics.com/viewtopic.php?p=481610#481610 ________________________________ Message 8 _____________________________________ Time: 11:02:28 AM PST US From: Charles Plumery Subject: Re: AeroElectric-List: Re: Z-* Question Charles Boyer and ? Sent from my iPad > On Jul 12, 2018, at 11:39 AM, jonlaury wrote: > > > > BMC_Dave wrote: >> It almost feels like I'm being intentionally gaslit, I'll try again. ... (snip) > > > For the etymologically curious: > > "The original (meaning) stems from 1938 stage play Gas Light and the dimming of the gas lights in the house that happened when the husband was using the gas lights in the flat above while searching for the jewels belonging to a woman whom he had murdered. The wife correctly notices the dimming lights and discusses it with her husband, but he insists that she merely imagined a change in the level of illumination." > > > > > Read this topic online here: > > https://nam02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fforums.matronics.com%2Fviewtopic.php%3Fp%3D481608%23481608&data=02%7C01%7C%7Cc8f107a61dfc4cacec1608d5e80db1de%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636670067865728097&sdata=g3E%2BbEL8ywC8tvRTOM1NaSlCrQ3qahsT0hWFxabZ260%3D&reserved=0 > > > > > > > > > ________________________________ Message 9 _____________________________________ Time: 11:52:52 AM PST US Subject: AeroElectric-List: Re: Non Aviation electrical conponent question From: "user9253" I did a google search for "microwave diode purpose" without quotes. The diode (rectifier) and the capacitor function together to effectively double the already-high voltage. This is called a voltage-doubler circuit. The google search results have links to testing diodes. Since your microwave has two identical circuits, you could switch parts between the two circuits to determine which is bad. -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=481613#481613 ________________________________ Message 10 ____________________________________ Time: 12:06:08 PM PST US Subject: AeroElectric-List: Re: Non Aviation electrical conponent question From: "user9253" This Youtube video says that microwave high voltage diodes can not be checked the normal way. The video shows how to do it using a 9 volt battery and meter. https://www.youtube.com/watch?vlrKf2PdVA -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=481614#481614 ________________________________ Message 11 ____________________________________ Time: 12:20:47 PM PST US Subject: AeroElectric-List: Re: Making your own fuseable links From: "user9253" Here is a link to Bob's electrical drawings. http://www.aeroelectric.com/PPS/Adobe_Architecture_Pdfs/ -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=481615#481615 ________________________________ Message 12 ____________________________________ Time: 02:53:01 PM PST US From: Mike Nellis Subject: Re: AeroElectric-List: Re: Non Aviation electrical conponent question Thank you Joe, that was helpful. Both diodes tested vood so ill keep on checking on why one of the 15a fuses to one of the HV power aupplies keeps blowing. Mike On Thu, Jul 12, 2018, 14:08 user9253 wrote: > > This Youtube video says that microwave high voltage diodes can not be > checked the normal way. The video shows how to do it using a 9 volt > battery and meter. > https://www.youtube.com/watch?vlrKf2PdVA > > -------- > Joe Gores > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=481614#481614 > > ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.