Today's Message Index:
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1. 09:54 AM - Re: Z-32 Question (jonlaury)
2. 10:00 AM - Re: Z-32 Question (jonlaury)
3. 10:43 AM - Re: Redundant Power switching (jonlaury)
4. 11:11 AM - Re: Electrical System Schematic Review (jonlaury)
5. 11:28 AM - Re: Corrected Electrical Schematic for Review (jonlaury)
6. 11:30 AM - Electrical System Schematic Review Rev A (jonlaury)
7. 01:00 PM - Re: Electrical System Schematic Review (user9253)
Message 1
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Subject: | Re: Z-32 Question |
Bob,
OK, got it.
But now that begs the question of why there is a fusible link between the Ebus
and Alt Feed Switch in Z-13/8 and not one in Z-32 between the contactor and Ebus?
Also, would you comment on my attached schematic (disregard pg 2)? In particular
your thoughts on using the GP contactor as a contactor for Alt # 2.
Is there a prohibition of having both alternators online simultaneously?
Thank you,
John
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=305962#305962
Attachments:
http://forums.matronics.com//files/z13_8q_mine_w_40a_contactor_111.pdf
Message 2
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Subject: | Re: Z-32 Question |
Bob,
I missed your response to "Corrected Electrical Schematic" so disregard that part
of my last post on this subject.
Thanks,
J
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Subject: | Re: Redundant Power switching |
Joe G,
My question was rendered moot by going with two DPST switches, one leg of which
powers the EFI ECU and the other, the Injectors, per Dick Tasker's suggestion
to eliminate the single point of failure.
I was being kind of myopic wondering if a DPST providing dual power sources to
a single load would see 1/2 the load on each leg.
Thanks,
John
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http://forums.matronics.com/viewtopic.php?p=305968#305968
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Subject: | Re: Electrical System Schematic Review |
user9253 wrote:
> ...
> Also, the diode needs to be in series with the contactor coil to prevent reverse
polarity damage from the ground power. See Bob's drawing Z-31B.
> Joe
> http://www.aeroelectric.com/PPS/Adobe_Architecture_Pdfs/Z31K.pdf
Joe,
I'm doing a separate post of my schematic revisions, titled ...RevA, B, etc.
Made the correction re the OVM.
Re Diodes
Because I'm using a continuous duty contactor with one 8-32 coil post, as drawn,
I asked about placement and orientation. Bob N responded
" The banded end of the diode connects to the
"BAT" terminal of the contactor which in turn
faces incoming power from the ground power
connector."
I thought that my schematic complied with Bob's suggestion???
Is the second diode on the wire to the switch breaker superfluous once the contactor
diode is oriented/located properly?
Thanks,
John
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Subject: | Re: Corrected Electrical Schematic for Review |
nuckolls.bob(at)aeroelect wrote:
> At 08:14 PM 7/21/2010, you wrote:
>
> >
> >
>
> You could do that but the contactor needs to be a 4-terminal
> device wired with three diodes like a cross-feed contactor
> in Z-14. The way you have it wired now, the contactor may
> not be assured a power source for closing it if the alternator
> doesn't self-excite. Better that coil power is assured with
> the appropriate array of diodes.
>
> Also, you need to fix the ov protection on this contactor
> per remarks offered earlier.
> Bob . . .
Bob,
Got the OVM where it's supposed to go. See post "Electrical Schematic for Review,
Rev.A"
I'm not sure what you mean by "self excite". The Ebus Alt Feed Switch provides
power to the field. If the alternator starts outputting voltage, doesn't the B
lead provide power to the coil of the contactor, closing it?. And if the alternator
isn't making any power, does it matter if the contactor closes or not??
John
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http://forums.matronics.com/viewtopic.php?p=305981#305981
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Subject: | Electrical System Schematic Review Rev A |
Most current revision
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=305982#305982
Attachments:
http://forums.matronics.com//files/z13_8q_mine_w_40a_contactor_reva_110.pdf
Message 7
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Subject: | Re: Electrical System Schematic Review |
> Is the second diode on the wire to the switch breaker superfluous once the contactor
diode is oriented/located properly?
John,
Your GROUND POWER / ALT 2 contactor circuit is looking good now. As for the
diode, the one below the contactor going to the GND PWR 2 amp breaker, it is wired
correctly and will protect against reverse polarity from an exterior battery.
The other diode on the right side of the contactor does not serve any useful
purpose that I can see. It does not hurt anything, except that it is an unnecessary
failure point. If this diode was intended as a coil arc suppression diode,
it is connected to the wrong contactor terminal. It should have been connected
where the O.V. module is now. Not to worry about that, just get rid of
that unnecessary diode because the O.V. module guards against voltage spikes.
I agree that as long as the battery is not dead and the E-BUS ALT FEED switch
is turned on, then the AUX Alternator should work and energize the contactor
coil.
Joe
--------
Joe Gores
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