---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Mon 10/17/05: 4 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 05:04 AM - voltage monitoring (bob noffs) 2. 04:43 PM - Off Topic: G'mint Auctions (Eric M. Jones) 3. 05:15 PM - Re: voltage monitoring (Dave Morris \) 4. 07:40 PM - Re: voltage monitoring (Rodney Dunham) ________________________________ Message 1 _____________________________________ Time: 05:04:51 AM PST US From: "bob noffs" Subject: AeroElectric-List: voltage monitoring --> AeroElectric-List message posted by: "bob noffs" hi bob, i am looking over z-20 for a jabiru engine. i will be using a grand rapids eis monitor . should i also install the crowbar over voltage module and the low voltage monitor ? g.r. offers a voltage monitor, are the other 2 monitors more likely to prevent damage by incorrect voltage? thanks, bob noffs ________________________________ Message 2 _____________________________________ Time: 04:43:30 PM PST US From: "Eric M. Jones" Subject: AeroElectric-List: Off Topic: G'mint Auctions --> AeroElectric-List message posted by: "Eric M. Jones" If you have too much time and money on your hands (or you just want to see where your tax money goes), check out-- http://www.govliquidation.com/ They are having a great electronic test equipment internet auction right now. This is the way the military disposes of their excess "Stuff" and you can buy amazing deals in oscilloscopes, Fluke meters, and all the really cool nerdy stuff. (My signal generator, and an awesome HP54502A digital scope which I need to fix... and several other devices came from these guys). Registration is simple and there are no tricks. Just watch the added charges for transportation and the condition codes. The neatest auction are those that say, "14 pallets of electronics...no further information." and they show a photo of ...well....14 pallets of stained and slightly mangled boxes of stuff. Many years ago two teenagers bought "Large Crate, A/C parts...no further information" and won a complete F104B fighter in a crate. They routinely have flight instruments. A few weeks ago they had entire "flight instrument six packs" suitable for most home-builts. You can buy a couple lots, sell what you don't want on eBay and use the money to buy other things. Not too bad as hobbies go. Regards, Eric M. Jones www.PerihelionDesign.com 113 Brentwood Drive Southbridge MA 01550-2705 (508) 764-2072 ________________________________ Message 3 _____________________________________ Time: 05:15:56 PM PST US From: "Dave Morris \"BigD\"" Subject: Re: AeroElectric-List: voltage monitoring --> AeroElectric-List message posted by: "Dave Morris \"BigD\"" The GRT "monitor" just alerts you to the voltage discrepancy. It doesn't do anything about it. If you can remember to react quickly enough, you don't need automated devices. What the LV and OV devices do is to handle the voltage problem for you (disconnect the main bus or disconnect the alternator) very fast for you, so you don't have to try to remember what to do in each case. Dave Morris At 06:58 AM 10/17/2005, you wrote: >--> AeroElectric-List message posted by: "bob noffs" > >hi bob, > i am looking over z-20 for a jabiru engine. i will be using a grand > rapids eis monitor . should i also install the crowbar over voltage > module and the low voltage monitor ? g.r. offers a voltage monitor, are > the other 2 monitors more likely to prevent damage by incorrect voltage? > thanks, bob noffs > > ________________________________ Message 4 _____________________________________ Time: 07:40:43 PM PST US From: "Rodney Dunham" Subject: AeroElectric-List: RE: voltage monitoring 7.50 BARRACUDA_HEADER_FP56 RBL: Blacklist bl.spamcop [Blocked - see ] --> AeroElectric-List message posted by: "Rodney Dunham" Bob, I too am about to wire a Jabiru with Z-20 architecture or similar. A friend of mine recently had a voltage regulator fail in his Challenger II. He runs a Rotax 503 (which uses a PM alternator similar to the Jabiru) and a Key West voltage regulator in a Kuntlzleman hot box. He monitors with the Grand Rapids EIS. He first noticed high voltages in the 18V range. He thought it was everything EXCEPT voltage regulator failure. The big red light would come on and the screen would tell him about it but the EIS didn't DO anything about it! He'd radio us in flight and ask what we thought might be wrong. He never took his alternator off line because he can't! He just flew to the next landing opportunity and scratched his head. Meanwhile... With Bob's OV protection system the alternator is taken off line immediately and automatically. You don't have to figure anything out or take any action. 16V for 5 millisec and the crowbar pops the breaker. More importantly, you won't hurt your plane while you're trying to decide what to do. It's done. That's that. And you can figure it out later. My friend doesn't have any other problems he's aware of as a result of his recent problem but who knows? This kind of damage is incremental. Something else may fail prematurely later and he'll not put the two together. Well, I'm probably preaching to the choir, but I'm putting OV protection on mine. Rodney in Tennessee