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cccbuntin
Joined: 11 Jan 2010
Posts: 2
Location: USA
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 Posted: Mon Jan 11, 2010 9:34 am Post subject: SD-8 Z-13/Z-25 practical setup |
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I have set-up the SD-8 as per drawing Z-13 and have just recently run across the Z-25 diagram. I can do this, but I'll have to order parts and do some time consuming changes (which is okay if worth it).
I have read many of the posts, and noticed Bob stated (back in 2006 from a post) that "The only thing that the Z-25 mod gets you is a cold startup sans battery."
I am trying to figure out if that is a typo or not? I am trying to figure out if it's worthwhile for me to do this upgrade/mod? Seems like several people have had issues with this Z-25 setup. If it is just for a cold startup, I'm not too worried about having that update. Chances are the battery will have (noticed I said chances) enough juice to excite the sd-8 without it having to be self exciting, especially in the way I plan to have it wired.
Right now, I have a three position switch setup that is labeled off -- stby alt (for the SD-8 ) -- ess pwr. If I go to ess pwr, the SD-8 is also on. As of now, I plan on flying around with the switch in stby pwr, and moving it to ess pwr in the event my main alt fails (to run what's on the ess pwr and have the stby pwr).
From my understanding of this (of flying around with switch in stby pwr with Z-13 diagram), it will be "energized" and ready if the 60 amp alt fails. It will be ready because the 60 amp alt is producing more volts than the sd-8, so the sd-8 is just sitting there, excited, ready to help when the 60 amp alt drops off line. I will know the 60 amp alt fails from the "main volts warn" light from the LR-3, in which case I will reach down and move the switch to ess bus, allowing only the ess bus to be powered and allowing the sd-8 to charge the system (battery/essential bus). Do I have this correct?
Any thoughts or criticism on this setup would be great. Thank you very much. Dave
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nuckolls.bob(at)aeroelect
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| Posted: Tue Jan 12, 2010 6:29 am Post subject: SD-8 Z-13/Z-25 practical setup |
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I am trying to figure out if that is a typo or not? I am trying to
figure out if it's worthwhile for me to do this upgrade/mod? Seems
like several people have had issues with this Z-25 setup. If it is
just for a cold startup, I'm not too worried about having that
update. Chances are the battery will have (noticed I said chances)
enough juice to excite the sd-8 without it having to be self
exciting, especially in the way I plan to have it wired.
It was developed to meet a "worry" posted by someone
here on the list . . . it's not likely to be a big
asset. I'd leave it off.
Right now, I have a three position switch setup that is labeled off
-- stby alt (for the SD-8 ) -- ess pwr. If I go to ess pwr, the SD-8
is also on. As of now, I plan on flying around with the switch in
stby pwr, and moving it to ess pwr in the event my main alt fails (to
run what's on the ess pwr and have the stby pwr).
You've combined some switch functions? Keep in mind
that the Z-figures were crafted for failure tolerance
where one goal was to eliminate single points of failure
for multiple systems. Bundling multiple functions into
one switch may make that switch critical.
>From my understanding of this (of flying around with switch in stby
pwr with Z-13 diagram), it will be "energized" and ready if the 60
amp alt fails. It will be ready because the 60 amp alt is producing
more volts than the sd-8, so the sd-8 is just sitting there, excited,
ready to help when the 60 amp alt drops off line. I will know the 60
amp alt fails from the "main volts warn" light from the LR-3, in
which case I will reach down and move the switch to ess bus, allowing
only the ess bus to be powered and allowing the sd-8 to charge the
system (battery/essential bus). Do I have this correct?
No. Leave it off until needed.
I'm working on a set of check-lists for the various Z-figures.
I'll try to that published pretty soon.
Bob . . .
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cccbuntin
Joined: 11 Jan 2010
Posts: 2
Location: USA
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