Today's Message Index:
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1. 07:33 AM - Re: Z8 Ground Power test switch (user9253)
2. 12:49 PM - 3300 alternator fuse (bob noffs)
3. 01:41 PM - Re: Z8 Ground Power test switch (jonlaury)
4. 01:48 PM - Re: Z8 Ground Power test switch (jonlaury)
5. 04:28 PM - Re: Re: Z8 Ground Power test switch (Bob McCallum)
6. 04:44 PM - Re: Re: Z8 Ground Power test switch (Bob McCallum)
7. 10:22 PM - Re: Z8 Ground Power test switch (jonlaury)
Message 1
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| Subject: | Re: Z8 Ground Power test switch |
John,
How about this circuit?
http://lh4.ggpht.com/_9Rmupq9lpCs/TK8pD8j5DCI/AAAAAAAAAFA/CwjWt8-Vr8o/s640/Gnd%20Pwr001.jpg
Move the switch up between the diode and the contactor coil. The OV protection
will always pop the breaker regardless of switch position. The switch will enable
the contactor coil or the lamp. The other half of the switch can control
the aux alternator as in your original circuit.
Joe
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=315100#315100
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| Subject: | 3300 alternator fuse |
thank you bob for the reply to my question.
bob noffs
Message 3
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| Subject: | Re: Z8 Ground Power test switch |
Joe,
That's great!
I incorporated it in the attached.
I'm still a bit unclear about why the diode is located where it is, but as long
as it's correct, I'll read up on that later.
Thanks a bunch,
John
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=315140#315140
Attachments:
http://forums.matronics.com//files/z8_w_sb_alt_gpj_conceptual_rev_a__114.pdf
Message 4
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| Subject: | Re: Z8 Ground Power test switch |
Positive Ground Power correction and drawing cleanup
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=315145#315145
Attachments:
http://forums.matronics.com//files/z8_w_sb_alt_gpj_conceptual_rev_a__188.pdf
Message 5
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| Subject: | Re: Z8 Ground Power test switch |
Jon;
You're showing a jumper between the starter push button and the starter
warning light. This means that as soon as you engage the starter with the
push button it will latch itself on via this jumper. Probably not a good
idea.
Bob McC
> -----Original Message-----
> From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-
> server@matronics.com] On Behalf Of jonlaury
> Sent: Friday, October 08, 2010 4:46 PM
> To: aeroelectric-list@matronics.com
> Subject: AeroElectric-List: Re: Z8 Ground Power test switch
>
>
> Positive Ground Power correction and drawing cleanup
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=315145#315145
>
>
>
>
> Attachments:
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>
http://forums.matronics.com//files/z8_w_sb_alt_gpj_conceptual_rev_a__188.pdf
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Message 6
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| Subject: | Re: Z8 Ground Power test switch |
Jon;
I thought I remembered earlier in this thread that the lamp and diode in
your ground power connector wiring was to warn of reverse polarity?? You
have in the drawings just submitted, however, connected the external power
supply (battery) directly across your auxiliary alternator. Should this be
reversed polarity the alternator will be seen as a direct short and most
probably its internal rectifiers will instantly fry long before the 40 amp
ANL can protect it. To provide reverse polarity protection the external
battery should not be connected to anything aboard the aircraft unless the
polarity is proven to be correct first.
The diode location you're querying causes the lamp to light only if the
ground power is correct polarity and only allows you to close the contactor
if the polarity is correct, but please note the issue above.
Bob McC
> -----Original Message-----
> From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-
> server@matronics.com] On Behalf Of jonlaury
> Sent: Friday, October 08, 2010 4:46 PM
> To: aeroelectric-list@matronics.com
> Subject: AeroElectric-List: Re: Z8 Ground Power test switch
>
>
> Positive Ground Power correction and drawing cleanup
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=315145#315145
>
>
>
>
> Attachments:
>
>
http://forums.matronics.com//files/z8_w_sb_alt_gpj_conceptual_rev_a__188.pdf
>
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Message 7
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| Subject: | Re: Z8 Ground Power test switch |
Bob,
Thanks for looking this over.
The starter jumper was an errant line that was left over after moving some things
around. I removed it and connected the warning lamp circuit to the 'I' terminal
of the contactor that receives bus voltage when the contactor is closed.
> The diode location you're querying causes the lamp to light only if the
> ground power is correct polarity and only allows you to close the contactor
> if the polarity is correct, but please note the issue above.
So wouldn't that provide the needed protection for the alternator? The way I see
it is that, if GP polarity is reversed, it only becomes a problem if the Stby
Alt switch is closed.
I confess that I'm at the ragged end of understanding the circuit and the problems
that you foresee. Do you see a solution?
John
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=315186#315186
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