---------------------------------------------------------- JabiruEngine-List Digest Archive --- Total Messages Posted Mon 03/24/08: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 01:08 PM - Re: Re: Wiring 3300 to an alternator switch (Noel Loveys) 2. 02:12 PM - Re: Re: Wiring 3300 to an alternator switch (Bob Haas) 3. 09:14 PM - Re: Re: Wiring 3300 to an alternator switch (Fiveonepw@aol.com) ________________________________ Message 1 _____________________________________ Time: 01:08:41 PM PST US From: "Noel Loveys" Subject: RE: JabiruEngine-List: Re: Wiring 3300 to an alternator switch Ralph: Turns, Speed, strength of the magnets and I believe proximity of the magnetic poles to the coils. Noel The generation of voltage by the PMA is limited by the number of turns on the windings, and I think the velocity of the magnets moving past. the current draw available would be determined by the rpm and strength of the magnets I expect, and these conditions will mean it is self limiting. But to get it to operate satisfactorily at say 2,000 rpm the unit will end up producing more than those requirements at 3,300 rpm. ________________________________ Message 2 _____________________________________ Time: 02:12:19 PM PST US From: "Bob Haas" Subject: RE: JabiruEngine-List: Re: Wiring 3300 to an alternator switch Any one, is there a known conversion for a belt driven or direct drive Alternator For the rear of a jabiru 2200 engine? Bob Haas Alpi Pioneer. -----Original Message----- From: owner-jabiruengine-list-server@matronics.com [mailto:owner-jabiruengine-list-server@matronics.com] On Behalf Of Noel Loveys Sent: Monday, March 24, 2008 4:05 PM Subject: RE: JabiruEngine-List: Re: Wiring 3300 to an alternator switch Ralph: Turns, Speed, strength of the magnets and I believe proximity of the magnetic poles to the coils. Noel The generation of voltage by the PMA is limited by the number of turns on the windings, and I think the velocity of the magnets moving past. the current draw available would be determined by the rpm and strength of the magnets I expect, and these conditions will mean it is self limiting. But to get it to operate satisfactorily at say 2,000 rpm the unit will end up producing more than those requirements at 3,300 rpm. ________________________________ Message 3 _____________________________________ Time: 09:14:32 PM PST US From: Fiveonepw@aol.com Subject: Re: JabiruEngine-List: Re: Wiring 3300 to an alternator switch Ralph- Good stuff- nice SCR description. I used these puppies for 25+years welding car bodies for GM, but still unqualified to understand overvoltage conditions in PMAs. Referring to page 54 of January '08 version of Jabiru document 3300HL-IM JEM3304-4.pdf: _http://www.usjabiru.com/images/pdf/manuals/new%20stuff/3300HL-IM.pdf_ (http://www.usjabiru.com/images/pdf/manuals/new%20stuff/3300HL-IM.pdf) which (somewhat miserably!) shows the regulator/rectifier circuit, it would seem the regulator is only offered one-half of the phase generated by the PMA, unless the SCRs provide the other half-cylce in some way I misunderstand. I've stared at this drawing for some time and have been unable to devine its secrets. If you could please take some time to decipher its function, I (we?) would be greatly indebted! For the sake of this discussion, let's call the transistors T1-T4, left to right. In my estimation, T1 is voltage reference controlling T4 based on zener value, which in turn controls T3 that gates the SCRs. T2 turns on the charge lamp, which seems to illuminate lamp when circuit is charging, as opposed to when it is not(?!). Perhaps you can unravel this Gordian knot for this lesser electron herder. You also mention 15-85 volts available from the PMA- original concern was regarding overvoltage. Are you saying that there is a potential (no pun intended!) for as much as 85 volts to the system which would normally be absorbed by the battery, and that battery disconnect with alternator running might develop into a "bad day"? Thanks again for your input! Mark **************Create a Home Theater Like the Pros. Watch the video on AOL Home. 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