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nuckolls.bob(at)aeroelect
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 Posted: Wed Jul 21, 2010 7:19 pm Post subject: Corrected Electrical Schematic for Review |
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At 08:14 PM 7/21/2010, you wrote:
| Quote: |
After review by a group member, he pointed out that my alt#2 B lead
was always hot because it was connected to the upstream side of the
battery contactor. As it 's a relatively long fat wire, he suggested
a separate contactor for it.
As I was figuring where to install it, I thought that the ground
power contactor is doing nothing most of its life and could serve as
the #2 alt B lead contactor as well.
I'd be grateful if any of you could take a look at the attached to
see if I'm neglecting something.
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You could do that but the contactor needs to be a 4-terminal
device wired with three diodes like a cross-feed contactor
in Z-14. The way you have it wired now, the contactor may
not be assured a power source for closing it if the alternator
doesn't self-excite. Better that coil power is assured with
the appropriate array of diodes.
Also, you need to fix the ov protection on this contactor
per remarks offered earlier.
Bob . . .
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jonlaury
Joined: 06 Nov 2006
Posts: 336
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| Posted: Thu Jul 22, 2010 10:25 am Post subject: Re: Corrected Electrical Schematic for Review |
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| nuckolls.bob(at)aeroelect wrote: | At 08:14 PM 7/21/2010, you wrote:
You could do that but the contactor needs to be a 4-terminal
device wired with three diodes like a cross-feed contactor
in Z-14. The way you have it wired now, the contactor may
not be assured a power source for closing it if the alternator
doesn't self-excite. Better that coil power is assured with
the appropriate array of diodes.
Also, you need to fix the ov protection on this contactor
per remarks offered earlier.
Bob . . . |
Bob,
Got the OVM where it's supposed to go. See post "Electrical Schematic for Review, Rev.A"
I'm not sure what you mean by "self excite". The Ebus Alt Feed Switch provides power to the field. If the alternator starts outputting voltage, doesn't the B lead provide power to the coil of the contactor, closing it?. And if the alternator isn't making any power, does it matter if the contactor closes or not??
John
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