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JohnInReno
Joined: 08 Sep 2007
Posts: 150
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 Posted: Thu Jul 03, 2008 11:58 am Post subject: Endurance bus load |
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I am starting to wire an RV9A using Z-13/8 and I came up with these
loads on the E-Bus:
Item Continuous Intermittent
AFS-EFIS 2.5
Trio A/P 1.0 1.0
Altitude Hold 1.0 1.0
Garmin x-ponder 1.0 (0.9-1.85)
Garmin SL-40 0.3 3.0 (2.1-3.2)
Trim Servo 0.2
This adds up to 5.8 amps continuous and 5.2 intermittent for a total of
11 amps. In practice, I would not expect all of the intermittent loads
to hit at the same time but how do I configure the E-Bus?
Should the E-bus be powered from the battery bus through a relay and a
10 amp fuse or 15 amp fuse? Am I correct in assuming that the SD-8 will
charge the battery when the load is less than 8 amps and the battery
will make up the difference when the load is greater than 8 amps?
John Morgensen
RV9A
Grumman AA1B-150 (a.k.a RV Trainer)
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_________________
John Morgensen
RV-9A - Born on July 3, 2013
RV4 - for sale |
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JohnInReno
Joined: 08 Sep 2007
Posts: 150
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| Posted: Thu Jul 03, 2008 12:22 pm Post subject: Re: Endurance bus load |
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I apologize for the formatting in the previous post.
The continuous load is:
AFS-EFIS 2.5
A/P 1.0
Alt Hold 1.0
X-ponder 1.0
SL-40 rx 0.3
The intermittent load is:
A/P Servo 1.0
Alt Hold Servo 1.0
SL-40 xmit 3.0
Trim Servo 0.2
Thanks again,
John Morgensen
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John Morgensen
RV-9A - Born on July 3, 2013
RV4 - for sale |
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nuckolls.bob(at)cox.net
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| Posted: Thu Jul 03, 2008 7:00 pm Post subject: Endurance bus load |
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At 12:54 PM 7/3/2008 -0700, you wrote:
| Quote: |
I am starting to wire an RV9A using Z-13/8 and I came up with these loads
on the E-Bus:
Item Continuous Intermittent
AFS-EFIS 2.5
Trio A/P 1.0 1.0
Altitude Hold 1.0 1.0
Garmin x-ponder 1.0 (0.9-1.85)
Garmin SL-40 0.3 3.0 (2.1-3.2)
Trim Servo 0.2
This adds up to 5.8 amps continuous and 5.2 intermittent for a total of 11
amps. In practice, I would not expect all of the intermittent loads to hit
at the same time but how do I configure the E-Bus?
|
| Quote: | Should the E-bus be powered from the battery bus through a relay and a 10
amp fuse or 15 amp fuse?
|
Since Z-13/8 has always been designed to support a
10A e-bus load, it probably should have featured the
robust alternate feed relay. I've updated Z-13/8 to
revision O where I've added the alternate feed relay
and self-excitation to the SD-8. The latest drawing
is at:
http://www.aeroelectric.com/PPS/Adobe_Architecture_Pdfs/Z13-8O.pdf
| Quote: | Am I correct in assuming that the SD-8 will charge the battery when the
load is less than 8 amps and the battery will make up the difference when
the load is greater than 8 amps?
|
Yes . . . sort of. Actually, if you have a voltmeter
on the e-bus, you can load the SD-8 until the bus falls
to 13.0 volts. Not enough to charge the battery but
too high to discharge the battery. At this condition
you can probably get close to 10A out of the SD-8
and hold whatever the battery offers in reserve for
approach to landing. And yes, the intermittent loads
are not significant to the total energy picture . . .
the battery can be tapped for those short intervals
without changing the outcome of your experience.
Bob . . .
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andrewbutler(at)ireland.c
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| Posted: Fri Jul 04, 2008 2:25 am Post subject: Endurance bus load |
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Hi Bob,
I have based my design around the Z13/8 architecture with dual P-Mags. It is still a work in progress.
With regards the SD-8 install, what is the difference between version N and O in practical terms i.e. what do the two addtitional resistors do?
I have bought the SD-8 (its in a box) and the PM/OV kit from B&C. I don't think the PM/OV kit has these resistors included.
Cheers, Andrew.
[quote]---
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JohnInReno
Joined: 08 Sep 2007
Posts: 150
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| Posted: Fri Jul 04, 2008 5:43 am Post subject: Endurance bus load |
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Thanks Bob!
john
Do Not Archive
Robert L. Nuckolls, III wrote:
| Quote: |
Since Z-13/8 has always been designed to support a
10A e-bus load, it probably should have featured the
robust alternate feed relay. I've updated Z-13/8 to
revision O where I've added the alternate feed relay
and self-excitation to the SD-8. The latest drawing
is at:
http://www.aeroelectric.com/PPS/Adobe_Architecture_Pdfs/Z13-8O.pdf
|
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http://www.matronics.com/Navigator?AeroElectric-List |
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_________________
John Morgensen
RV-9A - Born on July 3, 2013
RV4 - for sale |
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nuckolls.bob(at)cox.net
Guest
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| Posted: Fri Jul 04, 2008 6:26 am Post subject: Endurance bus load |
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At 10:20 AM 7/4/2008 +0000, you wrote:
| Quote: | Hi Bob,
I have based my design around the Z13/8 architecture with dual P-Mags. It
is still a work in progress.
With regards the SD-8 install, what is the difference between version N
and O in practical terms i.e. what do the two addtitional resistors do?
I have bought the SD-8 (its in a box) and the PM/OV kit from B&C. I don't
think the PM/OV kit has these resistors included.
Cheers, Andrew.
|
The two resistors and a bridge rectifier provide a feature
that should be built into all PM regulators for making the
system come alive (self-excite) with no battery present.
Some regulators may do that . . . I'm not aware of any
specific models. It would not be difficult to included
self-excitation capabilities in any of the PM regulator
products on the market . . . but that's anohter story.
So, you may choose to add this feature if you wish
but it's not a big deal without it. The e-bus alternate
feed boost relay IS recommended.
Bob . . .
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