AeroElectric-List Digest Archive

Tue 07/27/10


Total Messages Posted: 5



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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    Time: 07:06:35 AM PST US
    Subject: Z Diagrams
    From: Julian Pridmore-Brown <julian.pridmorebrown@gmail.com>
    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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    Time: 07:10:33 AM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
    Subject: Re: Z Diagrams
    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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    Time: 09:33:20 AM PST US
    From: "Gordon Smith" <gordonrsmith921@yahoo.com>
    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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    Time: 10:24:12 AM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
    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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    Time: 07:45:59 PM PST US
    Subject: Can I ground starter switch at panel?
    From: "rparigoris" <rparigor@suffolk.lib.ny.us>
    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 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=306518#306518




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