Today's Message Index:
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1. 04:39 AM - 3300 alternator fuse (bob noffs)
2. 05:38 AM - Re: Plane Power Alt. (Kevin Boddicker)
3. 08:07 AM - Re: Plane Power Alt. (Robert L. Nuckolls, III)
4. 08:24 AM - Re: 3300 alternator fuse (Robert L. Nuckolls, III)
5. 10:51 AM - Re: Z8 Ground Power test switch (jonlaury)
6. 03:01 PM - Re: Z8 Ground Power test switch (user9253)
7. 08:16 PM - Re: Z8 Ground Power test switch (user9253)
Message 1
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| Subject: | 3300 alternator fuse |
i recently heard of a jab installation where the regulator shorted out ,
causing damage to the firewall!
shouldn't the connection between the alternator and the regulator be fused
? which wire?
i was told the Z schematic doesn't show any such fuses.
bob noffs
Message 2
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| Subject: | Re: Plane Power Alt. |
Bob,
You are a good teacher! That is exactly what I thought I should do, just looking
for verification.
Again thanks a million for all you do and the help you offer to everyone. I am
certain many others feel the same way.
Kevin Boddicker
TriQ 200 N7868B 190hrs
Luana, IA.
On Oct 6, 2010, at 9:59 PM, Robert L. Nuckolls, III wrote:
>
> Yes,
> I am using the basic Z-11, with a B&C over voltage/under voltage module wired
to trip a 5A breaker. In case of an OV event the contactor in the B lead would
open. Essentially I would have two OV systems.
>
> Okay, since the PlanePower product is self contained
> and features ov protection I recommend you remove the
> previously installed system. I.e., install the PP
> alternator per manufacturer's instructions.
>
>
> There is one built into my plane as it sits, using the module that I bought from
B&C BC207-1/AEC9034-1,
> And there is one built into the new plane power alt. I have the module that will
open the 5A breaker if there is an OV event with my current ND alt. The module
is also used to test an OV event, and indicates low voltage.
> Are you saying I should disconnect the OVM I got from B&C and just use the OV
protection built into the Plane Power alt.
>
> The BC207/AEC9034 is a simple OV/LV annunciator and has
> no protective features. It was designed for very
> small PM alternator/battery systems common to
> the 2-cycle powered ultralights. In your case,
> the OV warning would NEVER be expected to
> operate because the ov protection system would
> shut the system down so fast that you'll never
> see an OV indication . . . only an LV indication
> after the alternator is shut down.
>
> The OVM from B&C and what ever Plane Power uses. I will attach a pic of the OVM.
Hope it gets through.
>
> That's the legacy crowbar ov protection module
> produced first by AEC, then by B&C and now by
> both companies. Yes, take that unit out along
> with the associated b-lead contactor.
>
>
> Bob . . .
>
>
>
>
>
Message 3
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| Subject: | Re: Plane Power Alt. |
At 07:35 AM 10/7/2010, you wrote:
>
>Bob,
>You are a good teacher! That is exactly what I thought I should do,
>just looking for verification.
>Again thanks a million for all you do and the help you offer to
>everyone. I am certain many others feel the same way.
>
I'm pleased that you find the service useful!
Bob . . .
Message 4
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| Subject: | Re: 3300 alternator fuse |
At 06:35 AM 10/7/2010, you wrote:
>i recently heard of a jab installation where the regulator shorted
>out , causing damage to the firewall!
> shouldn't the connection between the alternator and the regulator
> be fused ? which wire?
> i was told the Z schematic doesn't show any such fuses.
This is a mixed bag. Just because something overheats
and even catches fire does not necessarily mean that
a current overload was involved. I've worked a number of
airborne failures that produced severe damage and/or
fires that never tripped a breaker.
Breakers and fuses are designed to clear the "hard fault" . . .
a current flow that is several times greater than the
protection rating. The fault clears in milliseconds to
perhaps a few seconds. While the currents are high,
the duration is short and total energy dumped is relatively
small.
"Soft faults" are long term, intermittent shorts or
sustained arcing scenarios where current flow is not
great enough to trip the protection. Nonetheless, LARGE
quantities of electrical energy is converted to heat that
can erode structural materials and ignite combustibles.
It wouldn't hurt to fuse the alternator leads. A 30A
in-line fuse in one lead would provide protection against
hard rectifier/regulator faults but NOT necessarily
prevent the incident you described.
Bob . . .
Message 5
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| Subject: | Re: Z8 Ground Power test switch |
Joe,
In the attached, how would you wire the switch so that the contactor coil is not
energized when using the momentary half of the switch and yet preserving OV
protection for both halves?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=315041#315041
Attachments:
http://forums.matronics.com//files/gpj_test_switch_tentative_137.pdf
Message 6
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| Subject: | Re: Z8 Ground Power test switch |
John,
That is hard to answer without knowing exactly how the switch operates and what
you are trying to accomplish. But here is an educated guess based on your first
post.
Connect switch terminals 2 and 5 together.
Connect a lamp between terminal 3 and terminal 4 (or between 3 & 6, depending on
when you want the lamp to light). The lamp should be very low wattage or an
LED so that current through the lamp is not enough to energize the contactor
coil.
If the contactor coil is not energized, then you do not need OV protection.
If you provide more details about your goals and a data sheet for the switch, then
I can confirm or modify my suggestions.
Joe
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=315056#315056
Message 7
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| Subject: | Re: Z8 Ground Power test switch |
John,
Disregard my previous suggestion. I deleted my bad advice. I am going away for
a couple of days and will think about your circuit. Meanwhile, explain exactly
how you want the circuit to work.
Joe
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=315082#315082
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