Today's Message Index:
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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
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| Subject: | 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
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| Subject: | 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
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| Subject: | 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
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Home.
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