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StephenN570Z
Joined: 01 Apr 2006
Posts: 7
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 Posted: Wed Mar 21, 2007 8:22 pm Post subject: SD8 Connection queries |
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I have a SD8 standby alternator on my RV7 & am considering the various options for connecting it into the aircraft wiring. I have been looking at Bobs Z-8 diagram which uses an essential bus & cross tie. I would rather not have the essential bus & just have a way of connecting the both the SD8 & the battery into the main bus should the battery contactor fail as I see this as a single point of failure. Has anyone done something similar or is there another wiring diagram out there that shows another way of doing this.
Thanks in advance
Stephen
RV7 N570Z
Finish
[quote][b]
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nuckollsr(at)cox.net
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| Posted: Thu Mar 22, 2007 8:11 pm Post subject: SD8 Connection queries |
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At 09:21 PM 3/21/2007 -0700, you wrote:
| Quote: | I have a SD8 standby alternator on my RV7 & am considering the various
options for connecting it into the aircraft wiring. I have been looking at
Bobs Z-8 diagram which uses an essential bus & cross tie. I would rather
not have the essential bus & just have a way of connecting the both the
SD8 & the battery into the main bus should the battery contactor fail as I
see this as a single point of failure. Has anyone done something similar
or is there another wiring diagram out there that shows another way of
doing this.
|
What's the heartburn with Z-13/8? What failure do you
anticipate that the architecture won't cover?
Bob . . .
----------------------------------------
( IF one aspires to be "world class", )
( what ever you do must be exercised )
( EVERY day . . . )
( R. L. Nuckolls III )
----------------------------------------
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StephenN570Z
Joined: 01 Apr 2006
Posts: 7
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| Posted: Thu Mar 22, 2007 10:28 pm Post subject: SD8 Connection queries |
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I wanted to get away from using the essential bus. If you were just going to use a common bus do you think it would be practical to have the SD8 & the battery feeding this via some sort of cross tie / switch. In the event of a alternator & main contactor failure you would then be able to supply the bus from a combination of the SD8 & the battery. In hindsight the chance of 2 components failing at the same time is statistically irrelevant, still I am planning some long flights so want the best system can devise.
Regards
Stephen
RV7 N570Z
wiring - quelle suprise
On 22/03/07, Robert L. Nuckolls, III <nuckollsr(at)cox.net (nuckollsr(at)cox.net)> wrote:[quote]--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" < nuckollsr(at)cox.net (nuckollsr(at)cox.net)>
At 09:21 PM 3/21/2007 -0700, you wrote:
| Quote: | I have a SD8 standby alternator on my RV7 & am considering the various
options for connecting it into the aircraft wiring. I have been looking at
Bobs Z-8 diagram which uses an essential bus & cross tie. I would rather
not have the essential bus & just have a way of connecting the both the
SD8 & the battery into the main bus should the battery contactor fail as I
see this as a single point of failure. Has anyone done something similar
or is there another wiring diagram out there that shows another way of
doing this.
|
What's the heartburn with Z-13/8? What failure do you
anticipate that the architecture won't cover?
Bob . . .
----------------------------------------
( IF one aspires to be "world class", )
( what ever you do must be exercised )
[b]
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nuckollsr(at)cox.net
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| Posted: Wed Mar 28, 2007 5:38 am Post subject: SD8 Connection queries |
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At 09:21 PM 3/21/2007 -0700, you wrote:
| Quote: | I have a SD8 standby alternator on my RV7 & am considering the various
options for connecting it into the aircraft wiring. I have been looking at
Bobs Z-8 diagram which uses an essential bus & cross tie. I would rather
not have the essential bus & just have a way of connecting the both the
SD8 & the battery into the main bus should the battery contactor fail as I
see this as a single point of failure. Has anyone done something similar
or is there another wiring diagram out there that shows another way of
doing this.
|
Wire the SD-8 for self excitation and it will run without
a battery. If you're worried about the battery contactor
then dual battery contactors would fix that one. But then,
that's heavier than an e-bus.
I don't understand what optimization you perceive over
Z-13/8 as published.
Bob . . .
----------------------------------------
( IF one aspires to be "world class", )
( what ever you do must be exercised )
( EVERY day . . . )
( R. L. Nuckolls III )
----------------------------------------
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nuckollsr(at)cox.net
Guest
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| Posted: Wed Mar 28, 2007 5:38 am Post subject: SD8 Connection queries |
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At 11:26 PM 3/22/2007 -0700, you wrote:
| Quote: | I wanted to get away from using the essential bus. If you were just going
to use a common bus do you think it would be practical to have the SD8 &
the battery feeding this via some sort of cross tie / switch. In the event
of a alternator & main contactor failure you would then be able to supply
the bus from a combination of the SD8 & the battery. In hindsight the
chance of 2 components failing at the same time is statistically
irrelevant, still I am planning some long flights so want the best
system can devise.
|
Just tie the SD-8 to the downstream side of the downstream side
of the battery contactor instead of the upstream side and
leave the e-bus off.
Bob . . .
----------------------------------------
( IF one aspires to be "world class", )
( what ever you do must be exercised )
( EVERY day . . . )
( R. L. Nuckolls III )
----------------------------------------
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