Today's Message Index:
----------------------
1. 05:25 AM - Re: For sale (Jack Haviland)
2. 01:23 PM - Bad overvoltage module? (Weaver, Erich)
3. 02:09 PM - regulator-rectifier questions (Ken Ryan)
4. 02:45 PM - Re: Bad overvoltage module? (Jared Yates)
5. 05:53 PM - Re: Bad overvoltage module? (Robert L. Nuckolls, III)
6. 07:00 PM - Re: Bad overvoltage module? (Charlie England)
7. 07:26 PM - Re: Bad overvoltage module? (Jared Yates)
Message 1
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> On Dec 8, 2014, at 3:05 PM, Larry Mac Donald <lm4@juno.com> wrote:
>
> I am offering the following aviation tools for sale.
EAA Chapter 384 in Brighton MI has started a project to have students
and adults build an RV12 kit. Our offer for 100 of your 3/32=9D
clecos, cleco pliers and hand seamer is $50 (shipped to Brighton
Airport, 8664 Hyne Rd, Brighton MI 48114) .
Thanks for considering our offer!
Jack H.
810.629.1870
RV6A
Message 2
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Subject: | Bad overvoltage module? |
Quote:
I have a Z-13/8 electrical system on my RV-7A. While finishing up a
remodel of my panel, I tested my new switches and found that when I
turned on the backup PM alternator with engine off, my 5 amp circuit
breaker instantly tripped. Checked the switch and traced out my
wiring and both seem fine, so I now suspect that either the crowbar
over-voltage module or the associated S8005-1 relay from B&C is
bad. I removed the over-voltage module and my multimeter indicates
continuity between the two wires. Im thinking that should only
occur when there is an over-voltage event, so my module must be bad,
letting the current bypass the relay altogether and tripping my
breaker. Am I thinking this through correctly?
Sounds right. Did you get it from B&C or from me?
Doesn't matter. Drop it to me in an envelope and
I'll repair/replace it as appropriate.
Bob . . .
Thanks guys. It came from B&C and I went ahead and ordered a replacement f
rom them. Who knows when it went bad - haven't had a need to switch on the
back up alternator.
I noticed on a OVM doc available on the Aeroelectric Connection website a r
ecommendation that the OVM be checked every year as part of the annual insp
ection. Im wondering if I shouldn't just remove the OVM entirely. I shoul
d be notified if my voltage starts climbing from my EIS/EFIS warning lights
and be able to manually turn off a faulty alternator anyway. Bad idea?
Erich
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Message 3
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Subject: | regulator-rectifier questions |
Rotax wiring diagram shows the regulator-rectifier for the integrated
generator to have four terminals (in addition to the two that connect to
the generator).
These terminals are marked R,B+,L and C. I am trying to figure out what
they all do.
So far I think I have managed to figure out three of them:
C is the one that "turns on" the regulator/generator and it also supplies
current to the warning light.
L is the ground path for the warning light.
B+ delivers the charging current to the battery/bus.
Question 1: Have I correctly identified the function of C,L and B+ ?
Question 2: What is the function of the R terminal?
I do know that the R terminal must connect to the positive battery
terminal, but I would like to know its function.
Thanks in advance for your direct answers.
Message 4
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Subject: | Re: Bad overvoltage module? |
I'd vote for bad idea! You might browse through Chapter 6 of the AEC again
.
On Tue, Dec 9, 2014 at 4:18 PM, Weaver, Erich <erich.weaver@urs.com> wrote:
> *Quote:*
>
> I have a Z-13/8 electrical system on my RV-7A. While finishing up a
> remodel of my panel, I tested my new switches and found that when I
> turned on the backup PM alternator with engine off, my 5 amp circuit
> breaker instantly tripped. Checked the switch and traced out my
> wiring and both seem fine, so I now suspect that either the crowbar
> over-voltage module or the associated S8005-1 relay from B&C is
> bad. I removed the over-voltage module and my multimeter indicates
> continuity between the two wires. Im thinking that should only
> occur when there is an over-voltage event, so my module must be bad,
> letting the current bypass the relay altogether and tripping my
> breaker. Am I thinking this through correctly?
>
>
> * Sounds right. Did you get it from B&C or from me? Doesn't matter. Drop
> it to me in an envelope and I'll repair/replace it as appropriate. Bob .
.
> .*
>
>
> *Thanks guys. It came from B&C and I went ahead and ordered a replacemen
t
> from them. Who knows when it went bad =93 haven=99t had a ne
ed to switch on
> the back up alternator.*
>
> *I noticed on a OVM doc available on the Aeroelectric Connection website
> a recommendation that the OVM be checked every year as part of the annual
> inspection. Im wondering if I shouldn=99t just remove the OVM enti
rely. I
> should be notified if my voltage starts climbing from my EIS/EFIS warning
> lights and be able to manually turn off a faulty alternator anyway. Bad
> idea?*
>
>
> *Erich *
>
>
> This e-mail and any attachments contain URS Corporation confidential
> information that may be proprietary or privileged. If you receive this
> message in error or are not the intended recipient, you should not retain
,
> distribute, disclose or use any of this information and you should destro
y
> the e-mail and any attachments or copies.
>
> *
>
===========
m>
ldersbooks.com>
.com>
com>
om/contribution>
===========
www.matronics.com/Navigator?AeroElectric-List>
===========
===========
>
> *
>
>
Message 5
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Subject: | Re: Bad overvoltage module? |
>Thanks guys. It came from B&C and I went ahead
>and ordered a replacement from them. Who knows
>when it went bad ' haven=92t had a need to switch on the back up
alternator.
I'd still like to get the bad one even if
you don't want it back.
Bob . . .
Message 6
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Subject: | Re: Bad overvoltage module? |
On 12/9/2014 3:18 PM, Weaver, Erich wrote:
>
> *Quote:*
>
> I have a Z-13/8 electrical system on my RV-7A. While finishing up a
> remodel of my panel, I tested my new switches and found that when I
> turned on the backup PM alternator with engine off, my 5 amp circuit
> breaker instantly tripped. Checked the switch and traced out my
> wiring and both seem fine, so I now suspect that either the crowbar
> over-voltage module or the associated S8005-1 relay from B&C is
> bad. I removed the over-voltage module and my multimeter indicates
> continuity between the two wires. Im thinking that should only
> occur when there is an over-voltage event, so my module must be bad,
> letting the current bypass the relay altogether and tripping my
> breaker. Am I thinking this through correctly?
>
> *
> Sounds right. Did you get it from B&C or from me?
> Doesn't matter. Drop it to me in an envelope and
> I'll repair/replace it as appropriate.
>
> Bob . . .*
>
> **
>
> *Thanks guys. It came from B&C and I went ahead and ordered a
> replacement from them. Who knows when it went bad -- haven't had a
> need to switch on the back up alternator.*
>
> **
>
> *I noticed on a OVM doc available on the Aeroelectric Connection
> website a recommendation that the OVM be checked every year as part of
> the annual inspection. Im wondering if I shouldn't just remove the
> OVM entirely. I should be notified if my voltage starts climbing from
> my EIS/EFIS warning lights and be able to manually turn off a faulty
> alternator anyway. Bad idea?*
>
> **
>
> *Erich *
>
>
Only snag with that plan is if the failure happens while the pilot is in
a high-workload situation. If the pilot doesn't react quickly enough, he
could lose all the avionics to overvoltage just when he needs them most.
Message 7
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Subject: | Re: Bad overvoltage module? |
In AEC v12, page 6-7, Bob explains that the Crowbar OV module is designed
to work on a 5 millisecond interval. I don't think it matters much what
the pilot's workload is, he or she is not going to beat 5 milliseconds!
Also on that page and the page before, he writes about how the method that
the crowbar system uses to disconnect the circuit is special, so that it
doesn't break an inductive circuit. It's a really good chapter that makes
the case for why the Crowbar OVM is important. I would copy and paste it,
but in version 12, those pages are optically scanned.
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