Today's Message Index:
----------------------
1. 07:06 AM - Z Diagrams (Julian Pridmore-Brown)
2. 07:10 AM - Re: Z Diagrams (Robert L. Nuckolls, III)
3. 09:33 AM - E-Bus Off/On Indicator Light (Gordon Smith)
4. 10:24 AM - Re: E-Bus Off/On Indicator Light (Robert L. Nuckolls, III)
5. 07:45 PM - Can I ground starter switch at panel? (rparigoris)
Message 1
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Morning....I am in the process of a electrical system rebuild after a fire
on a Lancair IV. The notes I have from my Dad, the builder, indicate that it
was based on a Z-4 diagram. This was from about the mid 90's. Airplane first
flew in 1998. I am wondering if the current Z-14 is the updated
version....It looks pretty much the same. Also are there any notable changes
I should try to incorporate? The system had two batteries and two
alternators and a cross-tie that was normally open.
Thanks
Julian Pridmore-Brown
Message 2
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At 09:04 AM 7/27/2010, you wrote:
>Morning....I am in the process of a electrical system rebuild after
>a fire on a Lancair IV. The notes I have from my Dad, the builder,
>indicate that it was based on a Z-4 diagram. This was from about the
>mid 90's. Airplane first flew in 1998. I am wondering if the current
>Z-14 is the updated version....It looks pretty much the same. Also
>are there any notable changes I should try to incorporate? The
>system had two batteries and two alternators and a cross-tie that
>was normally open.
Good morning Julian. I recall our conversation a few
days ago on the phone.
Yes, Z-14 is the latest manifestation of the Z-4 drawing
in the book your dad was using. I don't think there have
been any changes significant changes to that drawing.
Bob . . .
Message 3
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Subject: | E-Bus Off/On Indicator Light |
I would like to include an Off/On indicator light (LED) for the E-Bus
alternate feed when using a relay as in Z-32 for a heavy duty E-Bus
Alternate Feed. I understand that the LED will have to include a series
resistor in any case.
My questions are regarding both the plus 14V. source for the light and the
pull to ground for the light. Can the plus 14V. come from the power to the
relay or must it be a separate source? Can the ground side of the LED be
tied to the ground side of the relay coil going to the switch or must it be
separate? Can these be mixed and matched in any way.
I have illustrated the 4 combinations using Z-32 as a basis. Please see the
attached drawings.
Gordon Smith
Message 4
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Subject: | Re: E-Bus Off/On Indicator Light |
At 11:31 AM 7/27/2010, you wrote:
>I would like to include an Off/On indicator light (LED) for the
>E-Bus alternate feed when using a relay as in Z-32 for a heavy duty
>E-Bus Alternate Feed. I understand that the LED will have to
>include a series resistor in any case.
>
>My questions are regarding both the plus 14V. source for the light
>and the pull to ground for the light. Can the plus 14V. come from
>the power to the relay or must it be a separate source? Can the
>ground side of the LED be tied to the ground side of the relay coil
>going to the switch or must it be separate? Can these be mixed and
>matched in any way.
>
>I have illustrated the 4 combinations using Z-32 as a basis. Please
>see the attached drawings.
>
>Gordon Smith
Suggest you wire the LED in parallel with the
relay coil. If the light is lit, at least there
is power to the coil terminals and it's because
the switch is closed. Further, if you put the
LED current limiting resistor at the relay, then
potential fault current in the LED "hot" wire is
inherently limited by the resistor and no fuse
or other protection is called for.
Alternatively, you can take power directly from
a tap on the e-bus itself.
Bob . . .
Message 5
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Subject: | Can I ground starter switch at panel? |
Would it be acceptable to feed 12V to the coil of my Rotax 914 starter relay and
only run 1 wire back to my panel mounted starter switch (looking for ground)?
I have power very close to starter relay, and ground very close to starter switch.
Ron Parigoris
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http://forums.matronics.com/viewtopic.php?p=306518#306518
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